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
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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.
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
Acidic dyes are commonly used for ________ stains
A) acid-fast B) negative C) flagellar D) endospore E) Gram
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