Answer:
The electron microscope
Explanation:
The microscope that would be best suited to study the inner structure of the chloroplast would be the electron microscope.
The electron microscope has a high magnifying property due to the fact that it uses a beam of accelerated electrons as a source of illumination, unlike the light microscope that uses visible light. While the light microscope might be enough to see the inner portion and the organelles of the cell, the tiny nature of the inner structure of the chloroplast means that the light microscope will not be able to view the details. A more powerful microscope like the electron microscope would be required.
When a star has greater mass, the amount of energy produced :
A. is more
B. is not affected by the mass
C. is less
name 2 special properties of water that are caused by hydrogen bonding.
And What is the function of a buffer?
iron and polar molecules
A buffeer is a solution that can resist pH of an acid or basic components.
The place where an impulse is tansmitted from a motor neuron to a skeletal muscle is called
A. Intercalated disc
B. Myofibril
C. Origin point
D.Neuromuscular junction
Answer:
Another specialization of the skeletal muscle is the site where a motor neuron's terminal meets the muscle fiber—called the neuromuscular junction (NMJ). This is where the muscle fiber first responds to signaling by the motor neuron.
D. Neuromuscular Junction
To determine the location of protein X in the plasma membrane, erythrocytes were subjected to two different treatments. First intact erythrocytes were treated with proteolytic enzymes. After the cells were lysed and membrane components extracted, protein X was intact. In the second experiment, the erythrocyte cells were permeabilized prior to treatment with proteolytic enzymes. When the plasma membrane components were then extracted, protein X was extensively fragmented What do these observations suggest about the location of protein X in the plasma membrane?
A. Proteolytic enzymes cannot fragment protein X in intact erythrocytes thus, protein Xis embedded in the lipid bilayer and does not have any extracellular domains
B. Since proteolytic enzymes cannot digest protein X uniess the plasma O o membrane is disrupted protein X is covalently attached to the inner leaflet of the lipid bilayer
C. Since proteolytic enzymes cannot digest protein X unless the membrane is disrupted protein X is polytopic and embedded in the lipid bilayer with several intracellular domains
D. Proteolytic enzymes cannot fragment protein X in intact erythrocytes therefore, protein X associates with the membrane transiently and is primarily located in the cytosol
E. Since proteolytic enzymes cannot fragment protein X in intact erythrocytes, protein X is tocated nside the cell and interacts with the inner surface of the membrane
Answer:
B.
Explanation:
The cell membrane contains integral membrane proteins that are stably embedded into the phospholipid bilayer. These integral proteins are composed of hydrophobic amino acid residues that interact with fatty acyl groups of the phospholipid membrane. Consequently, the proteolytic enzymes cannot act against specific residues of the protein X when it is embedded in the cell membrane, but they can digest the protein when it does not interact with functional groups localized at the inner leaflet of the plasma membrane.
Answer:
E
Explanation:
Because it's a peripheral membrane protein it can not be embedded in the lipid bilayer.
Sarah wanted to find out if heat had an effect on the growth of mold. She grew mold in nine jars. Each jar had the same amount and type of food. Three jars were kept at 0ºC. Three were kept at 90ºC. Three were kept at 27ºC. After four days she recorded the growth of the mold
Answer:
This question is incomplete; but from the understanding of the question, it is about identifying the variables in the experiment e.g independent variable, dependent variable, control variable, control group etc.
The variables are as follows:
Independent variable: HEAT at different temperatures
Dependent variable: GROWTH OF MOLD
Constants/Control variables: Same amount of food, Same type of food
Control group: Jars kept at 0°C
Explanation:
A variable in an experiment are those factors that are subject to change. The INDEPENDENT VARIABLE in an experiment is that variable that is manipulated or controlled in order to bring about an outcome. In this Sarah's experiment, the independent variable is the HEAT CHANGE.
The DEPENDENT variable is the variable that responds to the changes made to the independent variable. The response of the dependent variable is dependent on the independent variable. In this experiment, the dependent variable is the GROWTH OF THE MOLDS because it responds to changes in heat (independent variable).
The CONSTANT or CONTROL variables in an experiment refers to the variables that are kept constant or unchanged throughout the experiment. Although they are not part of the experiment but they can affect the outcome of the experiment if changed. The constants in this experiment are the SAME AMOUNT and SAME TYPE OF FOOD given to each jar.
A CONTROL group is the group that does not receive any experimental treatment I.e. In this experiment, the jars placed at 0°C did not receive any heat, hence, they are the control group.
The experimental groups were the jars kept at 90°C and 27°C respectively.
any ideas on what the answer is?
the answer to this question is starch
Ravi is unable to choose the right career path after completing his college education. He plans to visit a psychologist who might help him find
the right career. In this scenario, Ravi is most likely to visit a human factors psychologist.
a. True
b. False
Answer:
The correct answer is : false.
Explanation:
The branch of the psychology that deals with human behavior regarding work and work related problems is known as career counseling or vocational psychology, and counselors or specialized in this psychology known as vocational psychologist.
Ravi should visit to the vocational psychologist instead of human factor psychologists. Human factor psychologists deal with daily life factors that affect human behavior such as transportation, work, energy system and many more.
Thus, the correct answer is : false.
How can plant crops be modified so that they do not need to be sprayed with pesticides that are also harmful to humans like normal crops are?
A. They can be given DNA to allow them to resist harsh conditions.
B. They can be given human DNA so that the pests will not want to eat them.
C. They cannot be modified to be better than organic crops
D. They can be given bacterial DNA to produce a toxin that only works on bugs and other pests.
Genetically modified plants are engineered and have inbuilt resistance toward pests, insects, etc. These plants are introduced with bacterial DNA that produces toxins that kill pests. Thus, option D is correct.
What are genetically modified crops?
Genetically modified plants are made through the process of genetic engineering and recombinant technology by introducing the modified DNA or genetic material into the host to confer properties.
Genetically modified (GM) crops have been known to have traits beneficial to the plant to provide resistance against insects, pests, diseases, chemicals, the environment, etc.
The plant is introduced to the modified and engineered bacterial genome that releases toxic substances that can kill insects, rodents, pests, arthropods, etc.
Therefore, option D. the genetically modified plants produce a toxin that kills pests.
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Which is an interconnection of food chains in an ecosystem?
food web
trophic chain
energy web
producer web
Answer:
ITS A
Explanation:
Food web is an interconnection of food chains in an ecosystem. Therefore, the correct statement is option A.
What is food web?A food web is an ecosystem's intricate network of connected food systems. It shows how nutrients and energy move between organisms in an ecosystem.
Producers, consumers, and decomposers make create food webs, which illustrate how these creatures are related to one another by their interactions with one another's prey.
The arrows in a food web represent the flow of nutrients and energy from one organism to another. Typically, the energy flow begins with the sun or another primary energy source, passes through producers like plants, and then continues to consumers like herbivores and carnivores. A food web consists of many interconnected food chains and shows the flow of energy in an ecosystem.
Therefore, food web is an interconnection of food chains in an ecosystem which is constituted by producers, consumers, and decomposers.
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Which individual is at the highest risk of developing atherosclerosis?
a. Jack, a 45-year-old man who regularly consumes red meat
b. Susie, a 30-year-old woman who is on a DASH diet
c. Zayn, a 21-year-old man who is a college athlete
d. Bill, a 25-year-old man who is a vegetarian
e. Jill, a 20-year-old woman who consumes food rich in antioxidants"
Answer:
a. Jack, a 45-year-old man who regularly consumes red meat6
Explanation:
Atherosclerosis is the hardening and narrowing of your arteries that can prevent blood flow. It is commonly found in adult of age 40 and above due to stress, lack of exercise, lack of fruits in the diet.
Jack is 45 years he has the tendency of having the disease because it is more pronounced in people of his age and consumes red meat everyday which makes him at the risk of having atherosclerosis because too much of red meat could cause heart problems which is a symptom of atherosclerosis.
Artherosclerosis could leads to heart attacks, strokes, and perheral vascular disease.
It is characterize by an unusual heartbeat, Pain in the upper body such as chest and arms and shortness of breath.
Select the mechanisms used by tumor suppressor proteins to prevent the initiation and progression of cancer.
A. They initiate DNA repair processes to resolve DNA damage.
B. They promote uncontrolled cell division.
C. They induce apoptosis in response to DNA damage.
D. They act at cell cycle checkpoints to regulate progression through the cycle.
E. They enhance cell growth by causing certain signaling pathways to remain constitutive active.
Answer:
A, C and D
Explanation:
Tumor suppressor genes encode proteins that act to inhibit cell proliferation and thus repress the development of tumors, while oncogenes are genes whose overexpression induce carcinogenesis. Tumor suppressor proteins inhibit tumor growth by repairing errors during DNA replication, by suppressing cell cycle progression and by inducing apoptosis (cell death). A well-know tumor suppressor is the protein p53, which is a transcription factor that triggers antiproliferative cell programs by inducing or inhibiting critical effector genes.
Butter is an example of
A saturated fat
A polar molecule
An unsaturated fat
A carbohydrates
Answer:
The answer is A- A saturated fat
Which objective lens do you use to locate an object
on a slide?
High Power
Medium Power
Ocular
Scanning
Hey There!! ~
The answer to this is: High Power. Because, it shows that the Objective lens. Was, locate the specimen. Of the High Power.
Hope It Helped!~
[tex]By, ItsNobody[/tex]~
Which of the statements are ways that modern geneticists are addressing medical, social, or industrial problems?
a. learning how to clone humans to obtain organs for replacing failing or damaged ones
b. improving the yield of agricultural crops through genetic modification
c. developing genetic tests for conditions so that patients can receive appropriate preventive cane
d. studying viral genetics to learn how to control the spread of infectious diseases
Answer:
A, B, and D.
Explanation
Genetics can be explained or described as the branch of biology or science that deals with the study of characters or traits.
It should be understood that genetics help us to understand the type of characters a particular organism comprised of, and how these characters are being transferred from the parents.
In this case, recently, scientists have made use of the knowledge of the genetics to do some amazing things. This include the ability to produce crops that give a very reasonable yield, have the ability to clone human and have the knowledge of how to control the spread or incidence of diseases.
The bar chart below shows data for a system with two types of particles, x and y, in two connected regions, A and B. All of the x particles started in region A, and all of the y particles started in region B. Which line graph best depicts the data in the bar chart?
Answer:
C.
Step-by-step explanation:
We have two types of particles, x and y and two regions, A and B. The enunciated says that at the beginning all x particles are in A and all y particles are in B. Then, at the beginning, the 100% of x particles are in A and 0% of y particles are in A. So, the option A is discarded.
Now, the right part of the picture shows that after a while, 12 x particles go from region A to region B and 12 y particles go from region B to region A. Then, the percentage of x particles en region A will decrease and the percentage of y particles in region A will increase. That situation leaves us only with options B and C.
Finally, there will be 38-12 = 26 x particles in region A after the time and 12 y particles in region A. 26 and 12 represent two different percentages of 38 (the total) so, the graphs don't join. So, the answer is C.
Answer:
c
Explanation:
Other guy said so
When water molecules form into ice, ____. a. hydrogen bonds between water molecules readily break b. the water molecules pack less densely c. evaporation of water molecules happens more readily d. their structure becomes less rigid e. the water molecules jiggle more
Answer:
B
Explanation:
Since ice is less dense than water, it would make sense for the molecules to pack less densely.
When water molecules form into ice, the water molecules pack less densely.
The correct answer is B.
What are water molecules called?
The medical name for water is H2O. it's miles called H2O because it has atoms of hydrogen (H) and one atom of oxygen (O). There are thousands and thousands of these molecules in one drop of water. The shape water takes relies upon at the motion of the water molecules.
What is an instance of water molecule?Water is some other example of a molecule. Water is fabricated from 3 atoms, an oxygen atom and two hydrogen atoms, and accordingly is each a molecule and a compound. A chemical formula is an abbreviation that indicates which atoms are inside the molecule and in what quantity. for example, the chemical formula for water is H2O.
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5._____________________is factual information that results from a scientific investigation. A.bias B.data C.assumption D.none of the above
Answer:
Explanation:
5. data is factual information that results from a scientific investigation.
hopes this helps
What is the probability that the first offspring from the cross listed below will be heterozygous for all loci?
aa Bb dd Ee x AA bb Dd Ee
Answer and Explanation:
Cross: aa Bb dd Ee x AA bb Dd Ee
We can calculate the probability of getting heterozygous individuals in the progeny by using the product rule. Assuming that these four genes assort independently (events that occur independently from each other), we can infer that the F1 will have the next genotypic proportions for each gene:
1) aa x AA
F1) 4/4=1 Aa
2) Bb x bb
F1) ½ bb
½ Bb
3) dd x Dd
F1) ½ dd
½ Dd
4) Ee x Ee
F1) ¼ EE
2/4 = ½ Ee
¼ ee
So, to know what the probability is that the F1 of being heterozygous for all loci, we must multiply the respective individual probabilities of getting a heterozygous genotype, like this:
1 Aa x ½ Bb x ½ Dd x ½ Ee = 1/8 AaBbDdEe
The first heart sound is described as lub and corresponds to which event of the cardiac cycle?
Answer:
The first heart sound correspond to the closure of atrioventricular valves which comprises of mitral and transcupid valves.
Explanation:
The first heart sounds is describe as lub and its correspond to the closure of atrioventricular valves which comprises of mitral and triscupid valves because it's coincides with ventricular contractions as the ventricular pressures surpasses the pressure of the atrial which mark the begining of ventricular systole and the end of mechanical diastole. It is a single sound because the mitral and triscupid valves closes simultaneously.
Which of the following is a piece of empirical evidence supporting evolution? a. Biogeorgraphy b. Mycology c. Asexual reporduction d. progression of traits
Answer:
The answer is Biogeography
Answer:
Biogeography
Explanation:
Correct
Numerous reasons provide evidence for the theory of evolution. These include biogeography, vestigial structures, and DNA. It does not include mycology, asexual reproduction, or progression of traits.
atmospheric nitrogen is converted to compounds of Nitrogen in the soil by dash dash
My answer is Nitrogen Fixation.
The chemiosmotic model requires an intact outer mitochondrial membrane. is supported by the observation that, when isolated mitochondria have an artificial electrochemical gradient (higher pH in the matrix) imposed on them, electrons spontaneously flow through the respiratory chain. is supported by the observation that isolated mitochondria that are actively respiring cause the pH of the solution they are in to increase. requires that mitochondrial ATP synthesis and electron flow through the respiratory chain be obligately coupled.
Answer:
requires that mitochondrial ATP synthesis and electron flow through the respiratory chain be obligately coupled.
Explanation:
The chemosmotic model was a concept formulated by Peter Mitchell, who stated that during the phases of electron transport in the respiratory chain, an intense release of energy occurs. This released energy allows hydrogen ions to be transported from within the mitochondrial matrix to the intercellular medium. The result of all of this is the occurrence of a chemosmotic gradient. However, when interpreting what occurs in the chemosmotic model, we can see that this model requires that the mitochondrial synthesis of ATP and the flow of electrons through the respiratory chain must be coupled.
Which of the following regions of the body are the tibia and fibula?a. Coxal Regionb. Antecubital Regionc. Tarsal Regiond. Crural Region
Answer:
The correct answer is : crural region.
Explanation:
In human body, The crural region of the bone is the leg region which is extending to knee to ankles in simpler language. It includes the tarsal region, tibia, fibula, shin area of leg, pedal region.
The coxal area or region is the region of hip bone and pelvic bone. Antecubital region in elbow pit of the arm and tarsal region is part of the toe region.
Thus, the correct answer is : crural region.
The tibia and the fibula can be found in the crural region of the body.
The crural region of the body covers the shin areas of the leg. That is the area between the knee and ankle.
The area covers a series of bones which include the tibia and the fibula. Other bones found in the area include the patella, tarsal bones, metatarsals, and phalanges.
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The nutrition of some plants depends on a root-fungus association known as:_________.a. root noduleb. mycorrhizac. root haird. root hypha
My answer to this question is mycorrhizac.
what two types of environments can food chains be made from
Based on the Data shown in the in the Table, what question was most likely being tested? 1. which weeds grow faster in rainy seasons 2. how does the levels of rainfall affect the growth of sweet pea and chicory 3. how did the rainfall and growth of weeds change between the years of 1980 and 1984
Based on the data shown in the image, the most likely hypothesis being tested would be how the level of rainfall affects the growth of sweet pea and chicory.
Data analysisThe first column in the table indicates the years of study which range from 1980 to 1984.
The second column indicates the amount of rainfall fro each year. The third and fourth columns represent the yield per meter square of sweet pea and chicory.
Sweet pea and chicory are crops that serve different uses to man, unlike weeds. Thus, what is being tested has nothing to do with weeds.
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Which of the following enzymes is responsible for transcribing tRNA in eukaryotic cells?A. RNA polymerase I.B. RNA polymerase lI.C. RNA polymerase.D. Primase.E. RNase H.
Answer:
The correct answer would be - option C RNA polymerase III
Explanation:
RNA polymerase III is the only enzyme of RNA polymerase which is responsible for transcribing the tRNA in eukaryotic cells. Other than tRNA and 5s rRNA all other RNA genes are transcribe by the RNA polymerase II.
RNA polymerase 1 transcribes only rRNA genes in eukaryotic cells. It is a enzyme which is precursor for small RNA of cytoplasm and nucleus. RNA polymerase III found in nucleoplasm of the cell.
Thus, the correct answer would be - option C RNA polymerase III
A student investigated whether ants dig more tunnels in the light or in the dark. She thought that ants used the filtered light that penetrated the upper layers of earth and would dig more tunnels during the daytime. Ten ant colonies were set up in commercial ant farms with the same number and type of ants per ant farm. The same amount of food was given to each colony, and the colonies were in the same temperature. Five of the colonies were exposed to normal room light and five were covered with black construction paper so they did not receive light. Every other day for three weeks the length of the tunnels was measured in millimeter using a string and a ruler. Averages for the light and dark groups for I each measured were then computed. The averages are listed in the following chart.
Length of Tunnels(mm) constructed by Ants in different Light conditions
Day. Light. Dark
1 5 7
3 10 15
5 20 25
7 26 32
9 32 47
11 50 62
13 61 93
15 66 110
17 90 115
19 95 120
21 103 136
Q1. List all materials needed to do this experiment.
Q2. Promblem:
Q3. Hypotheses:
Q4. Write a support or non-support of hypotheses.
Q5. Independent Value:
Q6. Dependent Value:
Q7. Is there a control? If so...what is it?
Q8. Sources of Experimental Error:
Answer:
Please see below
Explanation:
Source of light, measuring tool (the string and ruler), ant food, ant farmsWhether or not the tunnels created by ants differ in length depending on the amount of light availableMore tunnels are dug by ants during the daylight hoursThe hypotheses will probably come out to be true since ants are usually hiding away from predators during the nightThe presence of light The length of a particular tunnelPerform a trial under normal conditions (room light)Inaccuracy or inconsistency in measurementsWhich of the following properties of water explains its solvent abilities for certain substances?
a) High surface tension
b) Kinetic energy of liquid water molecules
c) Polarity of water molecules
d) High specific heat
Answer:
the answer is c, polarity of water molecules
Explanation:
Water is the universal solvent, which has high solubility. The water is tasteless, odorless, and transparent fluid.
The correct answer is:
Option C. Polarity of water molecules
Water has solvent abilities for a certain substance because::
The water molecule is made up of two atoms of hydrogen and one atom of oxygen. The composition of water molecules provides its polarity and the ability to form hydrogen bonds.The polarity of the water makes it an excellent solvent and can dissolve many polar and other substances.
Thus, the correct answer is Option C.
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Which organ is highlighted?
a. spermatic cord
b. scrotum
c. epididymis
d. testis
Answer:
I think an image is missing from this question