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Which of the following are classified as killer, helper, memory, and suppressor?

A.

RBCS

B.

T cells

C.

B cells

D.

Platelets

E.

Which of the following are classified as killer, helper, memory, and suppressor?

Answer and Explanation

The Correct Answer is A

A. RBCs: 

Red blood cells (RBCs) carry oxygen and have no role in the immune response.

B. T cells:

T cells are classified into subsets like cytotoxic (killer), helper, memory, and suppressor (regulatory) T cells, each with specialized immune functions.

C. B cells:

While B cells also have memory capabilities and produce antibodies, they are not categorized into killer or suppressor types.

D. Platelets:

Platelets are involved in blood clotting, not immunity.


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Related Questions

Correct Answer is A

Explanation

A. Tonsils:

Tonsils are lymphatic tissues located in the pharyngeal region; they are partially encapsulated and help trap airborne or ingested pathogens.

B. Thyroid gland:

The thyroid is an endocrine gland that regulates metabolism, not part of the lymphatic system.

C. Thymus gland:

The thymus is fully encapsulated and located in the mediastinum; it matures T cells.

D. Spleen:

The spleen is a fully encapsulated lymphoid organ located in the left upper quadrant of the abdomen.

Correct Answer is B

Explanation

A. Digestive system through contaminated feces:

This is the port of exit for diseases spread by the fecal-oral route (e.g., cholera, hepatitis A).

B. Respiratory system by coughing or sneezing:

Droplet infections (e.g., flu, COVID-19, common cold) are primarily spread through respiratory secretions expelled via coughing or sneezing.

C. Central nervous system by contaminated cerebral spinal fluid:

While CSF can carry infections (e.g., meningitis), it is not a common port of exit.

D. Urinary system by contaminated urine:

Urinary tract infections may be transmitted this way, but not typically through droplets.

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