Question 1

Antigenic drift allows viruses to evade both humoral and cellular immune defenses.

Accepted Answer

Antigenic drift is a process in which a virus mutates over time, creating new strains that can be antigenically distinct from the original virus. This can allow the virus to evade recognition by the immune system, both in terms of humoral (antibody-mediated) and cellular immune responses. As a result, vaccines and immunity built up against previous strains of the virus may not provide complete protection against antigenically drifted strains.

Question 2

Explain why it is more difficult for the immune system to detect and destroy viruses than bacteria.Describe the primary mechanism used by the adaptive immune response to overcome this obstacle.

Accepted Answer

The answer of Explain why it is more difficult for...

Question 3

A single plasma cell can secrete two different antibodies that recognize different epitopes.

Accepted Answer

A single plasma cell is committed to producing antibodies of a single specificity, meaning it can only secrete antibodies that recognize the same epitope, not different ones.

Question 4

Explain how B and T lymphocytes produced a variety of cell surface receptors that can bind a wide variety of epitopes on antigens.How is this related to the clonal selection theory?

Accepted Answer

The answer of Explain how B and T lymphocytes produced...

Question 5

The constant region of an antibody molecule is only located on the light chain.

Accepted Answer

The constant region is located on both the heavy and light chains of an antibody molecule.

Question 6

Antigen presenting cells,like dendritic cells,interact with naïve T and B lymphocytes in the lymph nodes.

Accepted Answer

Antigen presenting cells, such as dendritic cells, play a crucial role in activating naïve T and B lymphocytes in the lymph nodes by presenting antigens to them.

Question 7

The IgG molecule is the most abundant immunoglobulin produced during an immune response.

Accepted Answer

IgG is the most abundant immunoglobulin produced during an immune response, accounting for approximately 75% of all antibodies in the blood.

Quiz 34: Innate and Adaptive Immune Responses to Virus Infection