Cyclins modulate the progression of cells through the cell cycle by directly
A) activating G proteins.
B) phosphorylating growth factor receptors.
C) activating protein kinases that are critical regulators of cell division.
D) degrading histones.
E) turning on genes necessary for DNA replication.
Answer: C
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In lineages that moved onto land, gills were replaced by lungs; kidneys became better at conserving __________, and
the circulatory system became more efficient. Fill in the blank(s) with the appropriate word(s).
The process illustrated in the figure is a step in
a. the production of recombinant DNA. b. probing for transferred genes. c. DNA fingerprinting. d. sequencing DNA. e. producing radioactive probes.
Hormones are a class of signaling molecule carried by the ___________________ to target cells. Fill in the blank(s) with the appropriate word(s)