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3 years ago

The cells directly responsible for cellular immunity are the ________ cells.

1 answer:

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The cells directly responsible for cellular immunity are the cytotoxic T cells (lymphocytes).

Cellular immunity is an immune response against infectious diseases caused by viruses and some bacteria. This mechanism does not involve antibodies, but rather cytotoxic T-lymphocytes, phagocytes and the release of cytokines in response to an antigen. Cytotoxic T cells, perform their function by killing infected cells via apoptosis.

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A forest fire caused by lightening destroys an entire forest. The population of deer was drastically reduced within the forest l

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What happens to water and dissolved minerals after they move across the epidermis of a root

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Answer:

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Explanation:

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2 years ago

What will be produced if wine is aerated and inoculated with bacteria of the genera acetobacter and gluconobacter?

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I think Acetic acid will be produced if wine is aerated and inoculated with bacteria of the genera acetobacter and gluconobacter. Acetobacter is a genus of acetic acid bacteria. This bacteria is used for the mass production of Acetic Acid, the main component in vinegar. Gluconobacter is also a genus of the acetic acid bacteria family.

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3 years ago

When a protein denatures, which type of bonding is effected?

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Answer:

When a protein is denatured, secondary and tertiary structures are altered but the peptide bonds of the primary structure between the amino acids are left intact. Since all structural levels of the protein determine its function, the protein can no longer perform its function once it has been denatured.A protein becomes denatured when its normal shape gets deformed because some of the hydrogen bonds are broken. Weak hydrogen bonds break when too much heat is applied or when they are exposed to an acid (like citric acid from lemon juice).

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2 years ago

Bacteria and other microbes can be used to "clean up" an oil spill by breaking down oil into carbon dioxide and water. Two sampl

aksik [14]

Answer:

For sample A, A=17.7 %, T=17.7 %, G=32.30%, C=32.30%

For sample B, A= 28.9%, T=28.9%, G= 21.10%, C= 21.10%

Explanation:

The composition of nitrogenous bases in DNA is calculated using the suggestions proposed by the results of the experiment performed by Erwin Chargaff.

He found that in a DNA sample the composition of purine to pyrimidine is 1:1. This indicates that the amount of purine equals pyrimidine. This can be presented as purines + pyrimidines= 100. Also, adenine binds thymine and cytosine binds guanine.

In the given question,

For sample A

A= 17.7 %, Therefore, thymine will be = 17.7 %,

A+T= 35.40%

Now, G+C=100- 35.40%

G+C= 64.60%

content of G= 64.60/2= 32.30%

content of C= 32.30%

For sample B

T=28.9%, A will be= 28.9%

A+T= 57.80%

G+C=100-57.80%

G+C= 42.20%

Thus content of G will be= 42.20/2=21.10

content of C= 21.10%

Thus,

For sample A, A=17.7 %, T=17.7 %, G=32.30%, C=32.30%

For sample B, A= 28.9%, T=28.9%, G= 21.10%, C= 21.10%

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3 years ago