Which of the following statements about the cell-mediated response is false?

a. Cyotoxic T cells touch-kill any body cells that display viral antigen-MHC complexes on their surfaces

b. A dendritic cell that engulfed a sick body cell displays antigen from that cell, becoming an antigen-presenting cell.
c. Activated cytotoxic T cells differentiate into memory cytotoxic T cells and effector helper T cells.
d. Naive helper T cells bind to antigen-MHC complexes on dendritic cells.


c

Biology & Microbiology

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Four of the five stimuli listed below are sign stimuli. Select the exception

a. a smiling human face b. the red spot on the beak of a herring gull c. the open mouth of a peeping baby bird d. a red-colored stimulus that triggers a territorial red-bellied stickleback fish to attack it e. a mother rat picking up young rats and returning them to the nest

Biology & Microbiology

In vertebrates, most of the fluid that ultimately exits the body as urine first enters the nephron tubules by the process of ________.

A. excretion B. secretion C. reabsorption D. absorption E. filtration

Biology & Microbiology

Acidic dyes are commonly used for ________ stains

A) acid-fast B) negative C) flagellar D) endospore E) Gram

Biology & Microbiology

The chromosomal abnormality Calvin Bridges observed as a characteristic of "primary exceptionals" is a result of:

A. mutation. B. nondisjunction. C. chiasmata. D. recombination. E. linkage.

Biology & Microbiology