In a muscle contraction, the force that shortens the sarcomeres comes from the myosin cross-bridges pulling on the actin filaments.
A myosin head essentially functions like a cocked spring that bends and delivers a power stroke when it binds to an actin filament. A single sarcomere is forced to contract and shortens as a result of the power stroke's actin filament sliding past the myosin.
If there is enough ATP and the myosin-binding sites are exposed, myosin binds to actin to start the cross-bridge cycling process. The muscle contracts as the sarcomere shortens. Since this binding cannot take place without calcium, free calcium is a crucial regulator of muscle contraction.
Therefore,In a muscle contraction, the force that shortens the sarcomeres comes from the myosin cross-bridges pulling on the actin filaments.
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The fluid from the __________ joins the sperm from the ____________ at the ejaculatory duct.
The fluid from the seminal vesicles joins the sperm from the vas deferens at the ejaculatory duct.
What is semen?Semen is the sticky, milky fluid produced in male reproductive organs that contains the reproductive cells or sperm.
The sperm cell is produced by the testes, which is the male reproductive organ.
However, the sperm does not come out of the male alone, it is embedded in a fluid that together makes up the semen.
The vas deferens joins with the seminal vesicle to form the ejaculatory duct, which passes through the prostate and empties into the urethra.
Therefore, the fluid from the seminal vesicles joins the sperm from the vas deferens at the ejaculatory duct.
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PLSS PLSS PLSSS HELP
You are an anthropologist analyzing bone remains from the grave of an ancient female human. Within one of the bones, you find an unusually high concentration of collagen. What does this suggest about the ancient female? (2 points)
She broke a bone and then died before it was fully healed.
She broke a bone and then died a few hours later.
She broke a bone at a very young age, but it fully healed.
She broke a bone at a very young age, but it did not fully heal.
The presence of the large amount of collagen shows that she died before the broken bone could heal. Option A
What is the function of collagen?Collagen is a protein that is secreted by the body to aid in the strengthening of the bones. As a result of this, it production wanes as the bones weaken with age.
Thus, having said that the concentration of collagen around the broken bone of the woman was high, it the follows that she broke a bone and then died before it was fully healed. Option A
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Describe the horizontal and vertical air motions in a high-pressure anticyclone and in a low-pressure cyclone.
Winds near the surface move across the isobars at an angle when the frictional force, pressure gradient force, and apparent Coriolis force are combined.
What is the motion of horizontal and vertical air in a high-pressure anticyclone and in a low-pressure cyclone?Winds near the surface move across the isobars at an angle when the frictional force is combined with the pressure gradient force and the apparent force of the Coriolis effect. Consequently, the air spirals and converges as it advances in the direction of low pressure. A cyclone sometimes referred to as a low-pressure system, is created by this spiraling inward toward a center of low pressure. Convergence is the technical term for this inward spiraling action, which likewise raises the air at the center.
Air spirals downward and outward from an anticyclone, also known as a high-pressure system, in a high-pressure area. Divergence is the name for this spiraling outward motion. Cyclones rotate anticlockwise in the northern hemisphere and clockwise in the southern hemisphere.
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Wearing formal clothing to a friend's wedding is an example of __________, whereas agreeing to a fellow student's request to sign a petition is an example of __________.
Wearing formal clothing to a friend's wedding is an example of conformity, whereas agreeing to a fellow student's request to sign a petition is an example of compliance.
What is conformity?
The propensity for someone to adopt the attitudes, beliefs, and behaviors of those around them is known as conformity. Overt social pressure or more covert, unconscious influence can both be used to enforce conformity. Whatever its shape, it has the capacity to be a potent force that can alter the behavior of big groups, ignite or quell conflicts, and do much more.
What is compliance?Compliance is the act of altering one's conduct in accordance with a request. These requests may be made directly, but they may also include less direct social influence.
Compliance is occasionally prompted directly. You comply with a specific request made by someone. Other times, the request could be sneakier and even more deceptive.
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Why is it difficult to test the sensory and learning abilities of a newborn?
Vision is the least developed sense at delivery as a womb is a dark location and there may be little possibility for development. Vision, like hearing, does increase unexpectedly over the early years of an infant's lifestyle.
The infant can see and hear what is happening around her and can communicate her desires and interests to others. mother and father can help their infants study with the aid of gambling with them. Infants have the ability to see faces and items of different shapes, sizes, and colors.
For infants, learning the senses is crucial for discovering the arena around them. Whilst toddlers see the face of a parent, they smile. They coo once they listen to a parent's voice or pull away from something hot after they contact it. If infants odor something terrible, they shrink back.
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For each type of cell transport, describe how it helps the cell reach equilibrium. Make sure
you discuss concentration gradients in your answer.
Type of Transport:
Diffusion
Osmosis
Facilitated diffusion
Answer:
I will leave your question unanswered. Thanks.
In a particular plant, leaf color is controlled by gene D. Plants with at least one D allele have dark green leaves and plants with the homozygous recessive dd genotype have light green leaves. A Dd plant is crossed with another Dd plant. The predicted offspring are represented by numbers in the Punnett square. Which box(es) correspond(s) to plants with a heterozygous genotype
Boxes 2 and 3 will correspond to plants with a heterozygous genotype
An organism with one dominant allele and one recessive allele is said to have a heterozygous genotype.
What is Heterozygous genotype ?The presence of two different alleles at a particular gene locus. A heterozygous genotype may include one normal allele and one mutated allele or two different mutated alleles (compound heterozygote)
In our example, this genotype is written Bb. Finally, the genotype of an organism with two recessive alleles is called homozygous recessive.Heterozygotes can get genetic disease, but it depends on the type of disease.Learn more about Heterozygous genotype here:
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Damage to the prefrontal cortex is most likely to result in?
Answer:
Diminish planning abilities
If an organism with the genotype aabb produces gametes, what proportion of the gametes would be bb?
Assuming independent genes and normal meiotic events, the gametes of an individual with genotype aabb are ab, ab, ab, ab. There are no bb gametes. The answer is NONE.
What is a gamete?
A gamete is a haploid cell that results from the meiotic division of germ cells during gametogenesis.
These haploid cells have half the number of chromosomes of somatic and germ cells, and their destiny is to merge with another gamete to produce a new diploid cell.
During gamete formation, homologous chromosomes separate after crossing over, and finally, sister chromatids separate too, resulting in four haploid cells, each of them with a different allele combination.
When genes are in different chromosomes or far from each other in the same chromosome, they express independent assortment during meiosis. These genes are independent.
Independent assortment means that during a meiotic event, alleles from two or more different genes distribute in gametes independently from each other.
Each gamete receives an allele of a gene that does not depend on nor influence the allele of another gene in the same gamete.
In the exposed example, the homozygous recessive genotype is composed of two diallelic genes ⇒ aabb
Genotype: aabbAllele combination ⇒ Gametes ⇒ ab, ab, ab, ab
Assuming independent genes, unless there is some sort of problem during meiosis, there are no gametes bb, because gametes result from the combination of both genes.
The answer is NONE. There are no gametes bb.
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Many organisms have developed resistance to antibiotics. What mode of resistance has mrsa acquired?
methicillin-resistant-staphylococcus-aureus (MRSA) infection is caused by staphylococcus aureus
MRSA is resistant to the complete beta-lactam class of antibiotics. Methicillin is a member of this class of antibiotics, along with others like the more popularly prescribed penicillin, amoxicillin, and oxacillin.S.aureus also causes pneumonia, mastitis, skin infections, bone infections, and inflammation of the heart's inner lining. S.aureus becomes resistant to antibiotics like methicillin by expressing foreign proteins named PBP (penicillin-binding proteins) resistant to its action. Hence methicillin-resistant-staphylococcus aureus becomes resistant to a wide range of antibiotics makes the treatment choices very limited. The alternatives for the treatment of MRSA are dependent upon lowering the methicillin resistance.learn more about MRSA here: https://brainly.com/question/22228129
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Fructose has the formula C6H12O6. How many moles of fructose are there in 0.100 g of fructose?
Considering the definition of molar mass, there are 0.00055 moles of fructose in 0.100 grams of fructose.
Definition of molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
The molar mass of a compound (also called Mass or Molecular Weight) is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.
Molar mass of C₆H₁₂O₆In this case, you know the molar mass of the elements is:
C= 12 g/moleH= 1 g/moleO= 16 g/moleSo, the molar mass of the compound C₆H₁₂O₆ is calculated as:
C₆H₁₂O₆= 6×12 g/mole + 12× 1 g/mole + 6× 16 g/mole
Solving:
C₆H₁₂O₆= 180 g/mole
Moles in 0.100 grams of fructoseYou can apply the following rule of three: If by definition of molar mass 180 grams of fructose are contained in 1 mole, 0.100 grams of the compound are contained in how many moles?
[tex]amount of moles= \frac{0.100 gramsx 1 mole}{180 grams}[/tex]
amount of moles= 0.00055 moles
Finally, there are 0.00055 moles of fructose in 0.100 grams of fructose.
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Transfusion reactions are the result of antibody reaction to foreign antibodies. MHC molecules on red blood cells. MHC molecules on white blood cells. plasma proteins. glycolipids and glycoproteins on the surface of red blood cells.
Correct answer-
Glycolipids and glycoproteins on the surface of red blood cells- This is the correct answer because the glycolipids present on the surface of red blood cells have to be compatible to the blood being transfused or received by the donor. If the blood received is not compatible it leads to transfusion reactions.Incorrect answers-
MHC molecules on red blood cells- This is incorrect because MHC molecules are not present on the surface of red blood cells.MHC molecules on white blood cells- This is also incorrect because MHC molecules attach themselves to pathogenic peptides. These molecules are not responsible for transfusion reactions.Plasma proteins- This is incorrect because the proteins present in plasma are not responsible for transfusion reactions.Learn more about transfusion reactions here-
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State the shortest number of days it takes an Earth observer to see the same phase of the Moon twice.
Answer:29.5 days
Explanation:
It takes 29.5 days for observers from earth to look at the moon phase twice.
What are the phases of the moon?The fact that the moon orbits the earth every 27.3 days and the phases cycle once every 29.5 days might be perplexing. The rotation of the Earth around the Sun is to blame for this.
Our Moon completes one full orbit of the Earth in 27 days, 7 hours, and 43 minutes. The distance between our Moon and far-off "fixed" stars serves as the basis for measuring what is known as the sidereal month.
However, one cycle of phases on our Moon lasts for around 29.5 days (from the new Moon to the new Moon).
Therefore earth observer takes 29.5 days to see the same phase twice of the moon.
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Which muscle is highlighted?
a) flexor digitorum longus
b) tibialis posterior
c) flexor hallucis longus
d) popliteus
The muscle which is highlighted is flexor digitorum longus and is therefore denoted as option A.
What is Flexor digitorum longus?This refers to a deep posterior muscle which is present in the lower leg and is responsible for the different movement of the great toe.
It is also involved in plantar flexion and foot inversion and also helps to maintain a medial longitudinal arch thereby making it the most appropriate choice.
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Does a person in need of an organ transplant have a moral right to obtain that transplant, supposing the availability of the needed organ?.
Answer:
The principle of “Do no harm.” The only way that removing an organ from someone seems morally defensible is if the donor chooses to undergo the harm of surgery solely to help another.
What information from the client would support the diagnosis of guillain-barré syndrome?
The most patients with typical GBS present with rapidly progressive bilateral leg weakness with hypo/areflexia in the affected limbs. In rare cases, patients can present with facial, oculomotor, bulbar, i.e. difficulty with swallowing and speaking, weakness, or primary sensory symptoms.
The clinical diagnosis of GBS needs to be confirmed by cerebrospinal fluid analysis and nerve conduction studies. Lumbar puncture is indicated in every case of suspected GBS.
The things to be monitor in Guillain-Barré syndrome (GBS) respiratory status of patients with GBS must therefore be carefully and frequently monitored. Pulse oximetry and blood gases are inadequate for early detection of failure because hypoxemia and hypercarbia are very late manifestations.
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a short sequence of DNA is replicated using a mixture of dideoxynucleotide triphosphates, which lack a hydroxyl group at the 3' location. The new strands are separated from the old DNA
Sanger sequencing mimics the natural process of DNA replication by using dummy nucleotides to stop replication whenever a specific nucleotide is encountered. Because this truncated replication happens repeatedly, nucleic acids of various lengths accumulate and can be used to determine the position of each nucleotide in the sequence
ddNTPs are included (dideoxynucleoted)
A representation of 16 nucleotides arranged in a single horizontal strand of DNA is shown. Horizontal cylinders represent the deoxyribose sugar molecule and vertical rectangles represent the nitrogenous base in each nucleotide. The deoxyribose sugar and nitrogenous base of a single DNA strand are shown in grey. Below the single strand are four DDNTPs and four individual nucleotides. Sugar molecules are black in the bottom four DDNTPs in the bottom four individual nucleotides. To represent the bases' chemical identities, the nitrogenous bases on the DDNTPs and the lower four nucleotides are colored differently: DDATP is green, DDCTP is orange, DDTTP is red, and DDGTP is blue. Thymine is blue, cytosine is orange, and adenine is green.
DNA sequence :
DNA sequencing is the process of determining the order of the nucleotides within a gene. The first DNA sequencing methods were time-consuming, but a major breakthrough came in 1975 with the development of the Sanger sequencing method. Sanger sequencing is named after the English biochemist Frederick Sanger, and it is also known as chain-termination sequencing or dideoxy sequence. The Sanger method was used to sequence the human genome some 25 years after its invention, and it remains an important method in laboratories around the world today, despite many technological advances and modifications.
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A woman who is heterozygous for the x-linked, recessive hemophilia allele mates with a man who does not have hemophilia. which of the possible offspring will have hemophilia?
If a mother is heterozygous (a carrier) for hemophilia and the father does not have hemophilia, each son has a 1 in 2 (50%) chance of getting his mother's hemophilia allele and having hemophilia. Each daughter has 1 in 2 (50%) chance of getting her mother's hemophilia allele and being heterozygous.
If one female is heterozygous for the hemophilia trait and is considered a carrier. One male receives a damaged X-chromosome and inherits the condition known as hemophilia. If a man does not have hemophilia, he will have a non-hemophilia allele on his X chromosome which in this case would be "H". The mans genotype would be "XHY". Man with hemophilia will have XhY genotype since it is an recessive disorder .
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Mitochondrial dna (mtdna) recovered from a fossil hominin from sima de los huesos in northern spain shows connections to the mtdna of?
Mitochondrial DNA (mtdna) recovered from a fossil hominin from sima de los huesos in northern spain shows connections to the mtdna of the Denisovans.
The Sima de los Huesos showed distinctive proof of DNA survival over an extended period of time. Based on the enzymatic amplification of a few short mitochondrial DNA (mtDNA) fragments from Middle Pleistocene cave bear bones. Given that the Sima de los Huesos fossils have Neanderthal-derived characteristics (such as in their dental, mandibular, midfacial, supraorbital, and occipital morphology), it is unexpected that the mtDNA from these fossils has a common origin with Denisovan rather than Neanderthal mtDNAs.
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The cafeteria served green beans for lunch starting at 11 a.m. By 1 p.m., the remaining green beans have become overcooked and mushy. What pigment is found in the green beans at 1 p.m.
Answer:
chlorophyllin
Explanation:
The green pigment found in green beans is known as chlorophyll. This green pigment turns to bright green in alkaline environments and is known as chlorophyllin
The difference in heat distribution between the poles and the equator is due to Earth’s
a. orbit around the sun
b. spherical shape
c. tilted axis of rotation
uneven heating between the equator and the poles the one air ICS and the cooler air from the reasons in the 0300 latitude belt on the either side of equator moves in these wines below the form of North and South towards the equator as the falls the air is colder than the lead to and 60 degree
Like the right atrium, the left atrium also has ______ in its auricle
Like the right atrium, the left atrium also has valve in its auricle.
What is heart?The heart is defined as the major organ of the cardiovascular system which is used by the body to pump blood through out the cardiovascular system.
The heart is made up of the following:
Left atrium,Left atrium,Right ventricle andRight ventricle.Both the left and right atrium are separated from the ventricle by the valves which helps to prevent the back flow of blood.
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Suppose your gram-stained a sample from a pure culture of bacteria and observed a field of red and purple cocci. Adjacent cells were not always the same color. What would you conclude?
If after gram-staining a pure bacterial culture red and purple cocci are observed and the adjacent cells were not of the same colour, It means it's an old stock of culture.
The Gram stain process is a multi-step differential staining procedure. Differential staining separates organisms based on how they respond to various stains. To put it another way, two organisms in a sample that has been stained differently might appear to be different colours.
Gram-positive and Gram-negative are the two primary subtypes of bacteria. Based on how these bacteria respond to the Gram stain, several types are identified. The hue of a Gram stain is purple. The bacteria in a sample will either stay purple or change pink or red when the stain and bacteria interact.
The bacteria are Gram-positive if they continue to be purple.
The bacteria are Gram-negative if they turn pink or crimson.
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Assessment of genetic risk for distribution of total interstitial white matter neurons in dorsolateral prefrontal cortex: role in schizophrenia
Assessment of genetic risk for distribution of total interstitial white matter neurons in dorsolateral prefrontal cortex: role in schizophrenia
It has been demonstrated that tissue engineering scaffolds with oxygen generating components can boost the amount of oxygen and cell viability under some circumstances. In this study, direct-write assembly (robocasting) was used to create biphasic calcium phosphate (BCP) scaffolds with a composition of 60% hydroxyapatite (HA) and 40% beta-tricalcium phosphate (-TCP), which have demonstrated a high potential for bone tissue engineering applications. The three-dimensional (3D) printed scaffolds were then dip-coated with various concentrations of calcium peroxide (CPO), an oxygen releasing agent, and employed for in situ oxygen synthesis in the implanted sites. CPO was contained within a polycaprolactone (PCL) matrix. Different methodologies were used to describe the created scaffolds' morphology, content, and structure.
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To absorb large particles, cells engulf them within their plasma membrane in a process called?
Answer: endocytosis
Explanation:
This forms a vacuole out of its membrane looking almost like a bubble that encloses the large particles.
During glacial maxima, australia, new guinea, and tasmania were a single land mass called?
During glacial maxima, Australia, new guinea, and Tasmania were a single land mass called Sahul.
The single Pleistocene continent known as Sahul united Australia with New Guinea and Tasmania. Rising sea levels gave rise to the distinct landmasses that we can now recognize, even though the sea level at the time was up to 150 meters (490 feet) lower than it is now.Australia, New Guinea, Tasmania, and Seram were all parts of the ancient continent Sahul.Since the Last Glacial Maximum, sea levels have risen. Around 18,000 years ago, Sahul began to be partially submerged. Sea levels kept rising until roughly 5000 BCE.After leaving Africa, early human migrations began in Sahul and Sunda. According to recent study, hundreds of individuals traveled in groups on bamboo rafts and eventually settled on Sahul.
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PLS HELP
What is the phenomenon called that occurs when changes in a protein appear to
accumulate at a constant rate over time?
A)morphological comparison
B) evolution stopwatch
C) molecular clock
D) homologous structure
when changes in a protein appear to accumulate at a constant rate over time is called option (c) i.e, Molecular clock.
What does molecular clock mean?The term "molecular clock" refers to a method that estimates the time in prehistory when two or more life forms diverged by analyzing the mutation rate of biomolecules. Typically, nucleotide sequences for DNA, RNA, or amino acid sequences for proteins serve as the biomolecular data for these calculations.
Hedges, a biology professor at Penn State, claims that the molecular clock counts the mutations that accumulate through time in the gene sequences of various species rather than counting seconds, minutes, and hours.
Mutation and recombination, the two fundamental biological processes that give rise to all heritable variations, are the foundation of molecular clocks. Mutations are modifications to the genetic code of DNA, for as when the nucleotide Guanine (G) turns to Thymine (T).
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When carbohydrate supplies are depleted in cells, amino acids from proteins can enter aerobic respiration after ______ is removed from the amino acids and excreted.
When carbohydrate supplies are depleted in cells, amino acids from proteins can enter aerobic respiration after nitrogen is removed from the amino acids and excreted.
Before proteins from food can be utilized by your cells, your body must first break them down into amino acids.
Some amino acids will be broken down for energy through cellular respiration if there are more amino acids than the body requires or if cells are starved.
Amino acids must first have their amino group removed in order to enter cellular respiration.
As a waste product from this process, ammonia is produced. In mammals like humans, the ammonia is transformed to urea and eliminated from the body through urine.
Different amino acids enter the cellular respiration pathways at various stages after being deaminated.
Hence, when carbohydrate supplies are depleted in cells, amino acids from proteins can enter aerobic respiration after nitrogen is removed from the amino acids and excreted.
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Based on the predictions of metapopulation biology, which scenario can be expected to exhibit the largest fraction of occupied habitat patches?
Meta-population is the patchiness of population in space and its role is dynamic, population insatiability, coexistence of species , the maintenance of diversity.
Metapopulation is colonization and extinction dynamics. The variable of prime concern is the proportion.As the population largest approaches the environment carrying resources become more scare and growth rate slows.
The maxima carrying number of species in environment can support indefinitely .A group of spatially separated population of similar organism which interact at some levels.It s population in which multiple populations as butterflies and cool reef fishes.Humans are evolved from multiple interconnected spread out across Africa in large meta-population.
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During the fourth generation, 27% of the dark moths were captured from clean forest B. What percentage of moths were recaptured from polluted forest A during the fourth generation
The percentage of moths that were recaptured from the polluted forest during the fourth generation is C. 140%.
The given image below shows the graph of the dark moths and the different generations
This also contains the percentages that were captured from clean forests and the ones captured from polluted forests.
What is a Graph?This refers to the depiction of different variables on the x and y-axis and the different relationships that exists between them.
Therefore, the percentage of moths that were recaptured from the polluted forest during the fourth generation is C. 140%.
This is because based on the graph data, 27% of the dark moths were captured from clean forest and in the polluted forest, that number rise to 140%
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The complete question is:
During the fourth generation, 27% of the dark moths were captured from clean forest B. What percentage of moths were recaptured from polluted forest A during the fourth generation?
A. 73%
B. 40%
C. 140%
D. 71%