T cells, also known as T lymphocytes or thymocytes. The main role of T cells in the immune system is which one of the following?

B. To directly kill virus-infected cells and activate other immune cells

A. To produce antibodies against pathogens

B. To directly kill virus-infected cells and activate other immune cells

C. To transport oxygen to infected tissues

D. To engulf and digest bacteria by phagocytosis

Everyday Science · Body Systems (Human Biology) · page 2 of 2

Everyday Science misc (168) MCQs with Answers

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11.
The synthesis of glycogen is known as _?
Correct Answer: D. Glycogenesis
One-liner
The synthesis of glycogen from glucose is known as Glycogenesis.
12.
Chemically antibodies are _?
Correct Answer: A. Proteins
One-liner
Chemically, antibodies are proteins, specifically immunoglobulins produced by plasma cells.
13.
Antibodies are not present in ?
Correct Answer: C. Saliva
One-liner
Antibodies are not present in saliva, although saliva does contain enzymes like lysozyme that provide some antimicrobial defense.
14.
When antibodies produced by B-cells kill the antigens, then it is called _?
Correct Answer: A. Humoral response
One-liner
When antibodies produced by B-cells kill antigens, it is called the humoral response.
15.
What directly triggers the activation of natural killer cells?
Correct Answer: B. Interferons
One-liner
Natural killer cells are directly activated by interferons, which are signaling proteins released by virus-infected cells.
16.
Permanent teeth is/are also known as?
Correct Answer: D. Secondary teeth
One-liner
Permanent teeth are also known as secondary teeth.
17.
T cells, also known as T lymphocytes or thymocytes. The main role of T cells in the immune system is which one of the following?
Correct Answer: B. To directly kill virus-infected cells and activate other immune cells
One-liner
The main role of T cells is to directly kill virus-infected cells and activate other immune cells.