The cells involved in innate immunity, whose absence increases the chances of developing malignant tumors, are _____.

Biology

1 answer:

Alexeev081 [22]3 years ago

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Answer:

The correct option is B (natural killer cells).

Explanation:

Natural killer cells: They are defined as the type of cytotoxic lymphocyte which are critical to the innate immune system. The NK cells play an important role in to provide rapid response to tumor formation, virus infected cells, and acting after three days of infection.

While cancer cells die, they release some antigens, than these antigens are recognized by the immune system, and later they are presented on the immune cells which are known as antigen presenting cells. So, if these cells are absent than they increase the chances of developing malignant tumors.

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If you extract the DNA of the coliphage φ X174, you willfind that its composition is 25 percent A, 33 percent T,24 percent G, an

kifflom [539]

Answer:

This composition of nucleotide given in the question do not obey the chargaff"s rule.

Explanation:

According to chargaff"s rule the total number of purine bases will be same to the total number of pyrimidine bases that is

Adenine+Guanine=Thymine+Cytosine

But here the above quation is not maintained because according to the question A+G=49%

and T+C = 51%.

Such DNA is replicated by rolling circle model.

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