Sperm are stored in the ____ after they are produced
a. epididymis
b. seminiferous tubules
c. penis
d. prostate gland
e. vas deferens
A
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During penetration of E. coli by the T4 phage
A. lysozyme is used to allow entry of the phage capsid. B. the tail acts as a "hypodermic needle," injecting the phage DNA into the cell. C. the protein fibers digest a hole in the cell wall. D. the bacterial receptor molecules open a hole through the cell wall.
Human eye color is an example of a trait that varies ____
a. according to the geographical area b. periodically
c. according to humidity d. continuously e. according to seasons
Most of the water vapor in the earth’s atmosphere
comes from evaporation from a. lakes. b. rivers. c. land. d. oceans. e. plants.
Chromosome-level gene repression involves
A) supercoiling. B) physical blockage of gene regions. C) chromatin formation. D) nucleosomes. E) All of these