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1 year ago

Destruction of lymphocytes with self-specificity is called select one:

Biology

1 answer:

spayn [35]1 year ago

3 0

Destruction of lymphocytes with self-specificity is called clonal deletion.

Clonal deletion is the removal through apoptosis of B cells and T cells that have expressed receptors for self before developing into fully immunocompetent lymphocytes. This prevents recognition and destruction of self host cells, making it a type of negative selection or central tolerance.

Clonal selection is antigenic-specific selection of a lymphocyte that activates it to produce clones of effector cells dedicated to eliminating the antigen that provoked the initial immune response. Clonal selection is the theory that specific antigen receptors exist on lymphocytes before they are presented with an antigen due to random mutations during initial maturation and proliferation.

Hence, the correct option is A

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) Imagine that you are studying a newly discovered bacteria from a hot spring in Yellowstone National Park. You examine the nitr

ikadub [295]

Answer:

Cytosine- 40%

Explanation:

DNA is the genetic material in virtually all living organisms. It is a molecule made up of long chains of nucleotides, which are its building block. Four types of nucleotides make up the DNA molecule viz: Adenine (A), Thymine (T), Guanine (G), and Cytosine (C).

According to Erwin Chargaff in his rule regarding DNA composition, he stated that in a DNA molecule, the amount of adenine must equal thymine while that of guanine must equal cytosine. In a nutshell, the total of all the base pair must equally be 100% i.e. (A + T) + (G + C) = 100%.

In this case where a newly discovered bacteria from a hot spring in Yellowstone National Park was found to contain 10% of adenine in its DNA. Since Adenine is 10%, Thymine base must also be 10% in accordance to Chargaff's rule.

Hence, 10% + 10% + (G + C) = 100%.

20% + G + C = 100%

G + C = 100 - 20

G + C = 80%

Since, G and C must be equal, then G = C = 80% ÷ 2 = 40%. This means that the percentage of cytosine will be 40%.

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2 years ago

A bacteria population triples in number each day . if there are 2,551,500 bacteria on the 7th day , how many bacteria were prese

Sedaia [141]

Well it is triples you can tell that it is a division question. So triples means by 3.
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3 years ago

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lozanna [386]

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sukhopar [10]

Answer:

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