Question

please answer all 4 questions asap

Question 15 3 pts Several types of innate immune cells attack antigens by: o Promoting apoptosis in cells containing the antigen o Producing antibodies that neutralize the antigen o Scaring them away o Phagocytosis and digestion internally Question 16 3 pts In a primary response, what part of the immune response responds the most quickly to a novel antigen? o Humoral adaptive immunity o Cell-mediated adaptive immunity O Innate immunity Question 17 3 pts Telomerase is frequently inactivated in cancer cells. Why might this be important in cancer progression? o This allows the cancer cells to divide indefinitely without losing their protective telomere caps This allows the cancer cells to migrate longer distances from the original tumor site This enables cancer cell survival even after detaching from other cells and the normal extracellular matrix This promotes angiogenesis Question 18 3 pts The Savannah cat is a hybrid between a domestic housecat (Felis catus) and the African serval (Leptailurus serval). Savannah cats can interbreed and produce viable offspring. What does this information tell you about Savannah cats, housecats, and servals? O Savannah cats must have an odd number of chromosomes o Savannah cats must undergo asexual reproduction The domestic housecat and the African serval must be the same species o Savannah cats must have an even number of chromosomes

Answer 1

Answer 15:
Option - Phagocytosis and digestion internally.

Innate immunity is non-specific and works by destroying the invading pathogens by phagocytosis.  

Answer 16:
Option - Innate immunity

Any novel antigens (pathogens) entering the system are immediately destroyed by response from innate immunity. They do not wait for the recognition and specific responses to the antigen.

Answer 17:
Option - This allows cancer cells to divide indefinitely without losing their protective telomere caps.

As the cell ages, the telomeres become smaller. And cells with smaller telomeres stop dividing. Cancer cells need to divide indefinitely.

Answer 18:
Option - The domestic house cat and the African serval must be the same species.

Organisms in the same species can interbreed to make a fertile progeny.