In prophase
A. cytokinesis occurs.
B. DNA is synthesized.
C. the chromosomes replicate.
D. the chromosomes condense, shorten, and thicken.
E. the spindle fibers disappear.
D
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Voluntary movements such as raising your hand are produced by the contraction of __ muscle cells.
Fill in the blank(s) with the appropriate word(s).
Ribosomes are composed of protein and
A) rRNA. B) mRNA. C) tRNA. D) DNA. E) mDNA.
What process lowers blood plasma levels of cholesterol-containing lipoproteins?
A. second messenger-activated, sterol transgenesis B. hydrophobic phagocytosis C. simple, transcellular membrane diffusion D. Na+ gradient-dependent, secondary active transport E. clathrin-dependent, receptor-mediated endocytosis
The structure that anchors the inferior end of the spinal cord to the coccyx is the
A) conus medullaris. B) cauda equina. C) filum terminale. D) lumbar enlargement. E) posterior median sulcus.