At one point in human development, tissue connects the fingers, giving the hand a “webbed” appearance. Enzymes
eventually destroy the cells of the webbing and the fingers separate. These enzymes are probably localized in the ____.
a. chromosomes
b. smooth endoplasmic reticulum
c. lysosomes
d. nucleus
e. vacuoles
ANSWER: c
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Action potentials never vary in magnitude along a particular excitable membrane
Indicate whether the statement is true or false.
Termites are insects that require the protozoan Trichonympha in their gut to synthesize the enzyme cellulase to degrade the cellulose in wood. The protozoan uses the end products of the cellulose breakdown (glucose). This is a(n) ________ relationship.
A. mutualistic B. parasitic C. commensualistic D. antagonistic
Situations in which one allele for a gene is not completely dominant over another allele for that gene are called
A) polygenic inheritance. B) multiple genes. C) multiple alleles. D) incomplete dominance.
Suppose an organism can alternate between aerobic and anaerobic respiration. If it had to use anaerobic respiration exclusively, how many glucose molecules must it break down to generate the same ATP as it would in aerobic respiration?
A) 14 B) 6 C) 19 D) 1 E) 38