Answer:
A
Explanation:
my answer is A because it is correct
The currently accepted model of the cell membrane was discovered by ________ in the year ______
A) Charles Overton, 1895
B) singer and Nicolson, 1972
C) Davison and Danielli, 1970
D) Irving Langmuir, 1917
Answer: B
Explanation: The currently accepted model of the membrane is the fluid mosaic model. S. J. Singer and G. Nicolson proposed the fluid mosaic model in 1972.
The cell membrane model depicts the arrangement of the biological membrane and its component. The fluid mosaic model was given by Singer and Nicolson in 1972. Thus, option B is correct.
What is the fluid mosaic model?
The fluid mosaic model was discovered by Singer and Nicolson and is a widely accepted model for the structural organization of the plasma membrane and its components. It elucidates the mosaic of plasma components.
The proteins, lipids, and carbohydrates are the main components of the plasma membrane that are arranged and shows the fluid nature of the biological membrane.
Its arrangement and structure allow the semi-permeable nature and its role as the barrier. It shows the membrane is a lipid bilayer that includes the hydrophobic tail and the hydrophilic head.
Therefore, the fluid mosaic model was given by Singer and Nicolson.
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The vector allows for protein expression in E. coli.
Briefly explain the role of the following elements in the context of gene expression and protein production:
1- LacP:
2- LacO:
3- LacZa:
4-Briefly explain and indicate what is required for high expression in E. coli in this context..
The vector also contains other important elements. Explain their role:
5- AmpR:
6- ori:
Answer:
1. Lac P or the promoter is the binding site for RNA polymerase, situated just upstream to the gene.
2. Lac O or operator is a sequence situated just downstream to the sequence of the promoter at which binding of the repressor protein is done and ceases RNA polymerase enzyme from binding.
3. Lac Z refers to the gene that encodes for protein beta-galactosidase, which further results in the formation of glucose and galactose from lactose.
4. For high expression in E.coli IPTG is required. It attaches with the lac repressor and discharges the tetrameric repressor from the lac operator in an allosteric fashion, thus, permitting gene transcription in the lac operon.
5. AmpR is also known as the ampicillin-resistant gene, which is utilized as a selective marker for selection against ampicillin antibiotic.
6. Ori or the origin of replication refers to the sequence of the genome, which is accountable for the initiation of replication.
2x - 5 = 7
slove for x
2x-5=7
2x=7+5
2x=12
x=12/2
x=6
_______
what is sexual reproduction
Answer:
See explanation below...
Explanation:
Sexual reproduction is a type of reproduction that involves a complex life cycle in which a gamete with a single set of chromosomes combines with another to produce an organism composed of cells with two sets of chromosomes.
Best Regards!
Answer:
the production of new living organisms by combining genetic information from two individuals of different types (sexes). In most higher organisms, one sex (male) produces a small motile gamete which travels to fuse with a larger stationary gamete produced by the other (female).
Is lead renewable or not?
Answer:
it is not renewable.........
Answer:
Lead is not a renewable resource. It is a metal that forms naturally in the Earth, but it takes a very long time for metals to form.
reptilesimprovements over amphibians
Which of the following does NOT describe telomerase? A. shortens the telomeres in cancer cells. B. present in embryonic cells. C. It stimulates cell division. D. It is an enzyme.
Answer:
option c is ur ANS mate .......
Which medical conditions are associated with large amounts of fat and sugar in your diet? Select three options.
Answer:
gall bladder disease
hypertension
osteoarthritis
Answer:
diabetes
heart disease
obesity
Explanation:
Hãy mô tả các bước tạo thư viện cDNA từ tế bào máu heo.
Answer:
What you mean bro?
Explanation:
Which is incorrect descriptions of the genetic event initiated by the HIV reverse transcriptase (RT) upon the HIV infection?
a. RT catalyzes initial synthesis of ssDNA using viral genomic RNA as the template.
b. The first RNA template is degraded after ssDNA synthesis.
c. The whole process is completed after synthesis of dsDNA.
d. tRNAs are adopted as the first primers.
e. None of these
Answer:
e. None of these
Explanation:
The immune deficiency viruses (HIV) are retroviruses that use a reverse transcriptase (RT) enzyme to produce a single-stranded DNA (ssDNA) from an RNA template. The reverse transcription allows retroviruses to replicate their genetic material, which is integrated into the host's genome as a double-stranded linear DNA molecule in a similar way to the mechanism of insertion used by endogenous retrotransposons. The synthesis of DNA is started by cellular tRNAs (tRNA3Lys) that are packaged into the virion. After reverse transcription, the HIV DNA enters the nucleus of CD4 immune cells (also known as CD4+ T cells), and then it integrates into the genome to coopt the host's cell machinery for its own replication.
Assume that the allele for curly tail is completely dominant to the allele for straight tail for an X-linked maternal effect gene. Which of the following can be true?
a. In order for a female to be curly tailed, her father must be curly tailed.
b. A straight tailed male must have a straight tailed mother
c. mother with a straight tail cannot have progeny with curly tails
d. A male with a curly tail received a straight tail allele from his mother.
Answer:
A
Explanation:
In order for a female to be curly tailed, her father must be curly tailed.
Before using any chemical in the lab, why should one first read the Material Safety Data Sheet (MSDS)?
The MSDS provides information on safe handling of the chemical.
The MSDS explains where the chemical can be purchased.
The MSDS provides the chemical formula for the substance.
The MSDS describes how the chemical will react with other substances.
Answer:
A
Explanation:
Took test on Edge.
Material Safety Data Sheet (MSDS) contains information related to occupational safety and health. The MSDS provides knowledge on the safe handling of chemicals. Thus, option A is correct.
What is MSDS?Material Safety Data Sheet (MSDS) is the data safety sheet that states the rules and details of handling and using the laboratory chemicals that are related to health. It is of great importance as it allows the learning of chemical hazards.
Before entering the lab and using the chemicals one should read the MSDS book so to get aware of the handling and precautions that have to be taken while performing any experiments. To work safely one should know its danger and should be prepared for emergencies.
Therefore, the MSDS provides knowledge on the handling of hazardous chemicals.
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The dark bands seen under the microscope in a skeletal muscle fiber are concentrations of actin protein called l-bands . It is true or false.
Answer:
it is false
Explanation:
it appears as light bands under microscope
Answer:
false
Explanation:
because dark band seen under the microscope in a skeletal muscle fiber are concentration of actin protein are known as A bands because they are anisotropic when viewed with polarized light
_is a molecule that directs all of a cells activities
Answer:
[tex]\boxed{\mathrm{Nucleus}}[/tex]
Explanation:
The nucleus directs all cellular activities. The nucleus also contains genetic material of eukaryotic organisms.
Anyone know this??? Help!!!
Devise an experiment to test the effect of pH on the activity of biological washing powder
Answer:
I think you are nepali yeah but I don't have your question ❓ answer
During inhalation, the chest cavity _________ in volume, _________ the pressure in the lungs.
Answer:
1. reduce la presión interna
2. el aire se precipita hacia adentro y llena los pulmones.
Explanation:
Wall lizards are not seen during cold, Why?
Wall lizard are not seen because blood becomes cold inside the body.
Answer:
Lizards are cold-blooded. They use their enviornment to control their body temperature. If a lizard is cold, it will go somewhere warmer. If a lizard is hot, it will go someone to cool off.
The lizard may find somewhere in direct sunlight, bury themselves in a hole, or bury themselves under leaves to keep warm.
Which statement best describes geothermal energy? Geothermal energy can be used to fuel vehicles. Geothermal energy increases the risk of a nuclear accident. Geothermal energy is the most abundant nonrenewable resource. Geothermal energy can be used as a source of electricity.
Answer:
Geothermal energy
Explanation:
can be used as a source of electricity. hope this helps you :)
Answer:
D
Explanation:
Tell me three things that you know about controlling microbial growth - think about how you handle certain foods in you home. Why is it so important to learn about how we can control microbes
1. Cooking food properly. Undercooked foods may still contain microorganisms that are harmful.
2. washing raw foods properly. It can remove thermophilic microorganisms which can't be inhibited by temperature.
3. Hands should be clean. Handling affects the most.
Its important to learn about controlling microbes because
microbes are everywhere and many are really harmful for other living beings. so,
•To be safe from life-threatning diseases.
what is the feature of the eye and it's parts
Answer:
1. Cornea
2. Pupil
3. Iris
4. Conjunctiva Glands
5. Lacrimal Glands
Answer:
The cornea, a clear window at the front of the eye, covers the iris and the pupil. A clear lens, located behind the pupil, acts like a camera lens by focusing light onto the retina at the back of the eye. The retina is a light-sensitive inner lining at the back of the eye.
make me brainliest
Where does translation and transcription occur in prokaryotic cells? (1 point)
O nucleus
O cytoplasm
O ribosomes
ocell membrane
Answer:
Cytoplasm
Explanation:
Answer:
operon
Explanation:
Lactose (milk sugar) is a carbohydrate that is formed by combining galactose and glucose. Which term best describes this molecule?
Answer:
disaccharide
Explanation:
A disaccharide is a form of sugar that is made up of the combination of two other sugar molecules that are simple. They possess the property to dissolve easily in water. The process that occurs to join the two simple sugars includes the removal of water from the molecules. Sucrose, lactose, and maltose are the three disaccharides.
Answer:
disaccharide
Explanation:
A disaccharide is a form of sugar that is made up of the combination of two other sugar molecules that are simple. They possess the property to dissolve easily in water. The process that occurs to join the two simple sugars includes the removal of water from the molecules. Sucrose, lactose, and maltose are the three disaccharides.
Which of the following pairs of organisms
would have the MOST SIMILAR niche in
their environments.
Zebra and Lion
Squirrel and Chipmunk
Robin and Bald Eagle
Oak Tree and Mushroom
Answer:
Squirrel and Chipmunk
Answer:
C. a lion hunting for a zebra in the grassland
Explanation:
E2023
Describe your plan to preserve the biodiversity of the town's lake. Make sure to include the materials that you would need for your plan to work and how you would scale it up to test it.
Answer:
10 Ways to Protect and Conserve Biodiversity
Government legislation.
Nature preserves.
Reducing invasive species.
Habitat restoration.
Captive breeding and seed banks.
Research.
Reduce climate change.
Purchase sustainable products.
Which of the following is true about the speed of light?
O it is a constant when the light is traveling in a vacuum.
O It speeds up or slows down depending on the observer.
O It is slowest in a vacuum.
O lt varies depending on the color of the light.
Answer:
It is a constant when the light is traveling in a vacuum.
Explanation:
When neuroscientists employ the term "nucleus", they are usually referring to:_____.
a. a cluster of glial cells in the dorsal-medial CNS.
b. a neural unit composed of anatomically and functionally related neurons.
c. a group of homologous ganglia located either in the cortex or in the cerebellum.
d. cognitively synchronized clusters of apical dendrites anywhere in the PNS.
Answer:
B. A neural unit composed of anatomically and functionally related neurons.
Based on the data table below, which number would be the BEST choice for the top number of the scale on the vertical axis of a scatter plot showing this data?
Answer:
D. 70
Explanation:
From the table given, we can easily tell that distance (m) is dependent on time (s). Distance is a dependent variable, while time is an independent variable.
If both variables were to be plotted to show the relationship between them on a scatter plot, the dependent variable is usually plotted on the vertical axis (y-axis), while the independent variable would be plotted on the horizontal axis (x-axis).
Distance would be in the vertical axis, while time would be in the horizontal axis.
Therefore, the BEST choice for the top number of the scale on the vertical axis would certainly be 70, because the highest value for distance (m) on the table of values is 69.
1. Research 5 functions of the frontal lobe and explain them in detail with example.
2. Explain what you think might happen if someone damaged frontal lobe. You must mention the functions you have listed
Answer:
Solving a problem, memory, language, judgement, social and sexual behavior.
Explanation:
5 functions of the frontal lobe are given below:
1) it control the expression of emotions.
2) it is responsible in solving a problem.
3) it also control the memory and language.
4) it helps in judgement.
5) it is responsible for social and sexual behavior.
If frontal lobe is damaged, the individual may lose its memory, judgement ability. the social and sexual behavior is also disturbed. It may lose the ability to solve a problem and also have language problem.
The bacteria Listeria monocytogenes is capable of doubling every 36 hours in the refrigerator at 4°C and can grow even when temperatures are less than 2°C. Therefore, L. monocytogenes is best classified as a psychrophile.
a. True
b. False
Answer:
True
Explanation:
Listeria monocytogenes is a psychrophilic food-borne pathogen that is problematic for the food industry. Structures of Csps from psychrophilic bacteria have not yet been studied.
Listeria is not killed by freezing. Growth is arrested altogether, but normal growth will be resumed after thawing.
What physical traits were favored in the peppered moth AFTER the Industrial Revolution?
Answer: Their skin color was dark which made the moths blend in. During the Industrial Revolution, the soot from factories caused the trees to become black. The light colored moths became easier to kill because they could not blend into their environment.
Explanation: