What phase of mitotic interphase is missing from meiotic interkinesis?
A. G0 phase
B. G1 phase
C. S phase
D. G2 phase
Answer: C. S phase
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In placental mammals such as humans the dosage compensation mechanism to essentially equalize
expression of sex-linked genes in males and females is
a. doubling the gene expression for most genes on the X chromosome in males. b. doubling the number of X chromosomes in males early in embryonic development in all cells except for precursors of sex cells. c. having all major genes on the X chromosome also present on the Y chromosome. d. halving the gene expression for most genes on each X chromosome in females. e. inactivation of one of the two X chromosomes in most body cells of females.
Nitrogen fixation is the process by which gaseous nitrogen is converted to nitrate
____________________ Indicate whether the statement is true or false.
Darker bodies located in the nucleus of some cells are called
A. mitochondria. B. Golgi bodies. C. nucleoli. D. nucleus.
The structure(s) critical to the function of a chemical synapse include
A. vesicles. B. neurotransmitters. C. gap junctions. D. voltage-gated Ca2+ channels. E. electrical signals.