Which type of bacterial toxin is matched incorrectly with its description?
A) toxemia: a toxin produced during a viral infection
B) type 3 exotoxin: bind to a membrane receptor then enter the cell
C) type 2 exotoxin: disrupt and damage the host cell membrane leading to cell lysis
D) type 1 exotoxin: bind to the targeted host cell at a membrane receptor but do not enter the cell
E) endotoxin: enters the bloodstream during infection with Gram-negative bacteria
Answer: A
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a. leads to uniform characteristics in a population. b. results in new combinations of genetic traits. c. produces genetic clones. d. requires less tissue differentiation than asexual reproduction. e. only requires mitosis.
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Quaking aspen can send out underground stems for asexual reproduction. Sexual reproduction is not as common, but when it does happen, the haploid gametes have 19 chromosomes. How many chromosomes are in the cells of the underground stems?
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