Biology Immunity MDCAT 2017
PMDC Verified Question 90 of 99
____ cells survive for a few days and secrete a huge number of antibodies in blood, tissue fluids or lymph.
A
Memory
B
T-lymphocytes
C
B-lymphocytes
D
Plasma clone
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Plasma clone
Concept:

Following activation by an antigen, naive B-cells undergo rapid clonal expansion and differentiation.

Formula:

None

Solution:

  • An activated B-cell differentiates into an effector cell called a plasma cell (or plasma clone).


  • These plasma cells become highly metabolic factories, surviving only for a few days to weeks, but secreting up to 2,000 antibody molecules per second into the circulation.


Why other options are incorrect:

  • Memory cells: Survive for decades to provide long-term immunity but do not secrete large volumes of antibodies themselves until reactivated.

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