Which types of hormones can enter cells and turn specific genes on and off?
a. steroid and peptide hormones
b. steroid and thyroid hormones
c. thyroid and peptide hormones
d. peptide and phospholipid hormones
e. steroid and phospholipid hormones
b
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The skin gills of sea stars are structures
a. for the exchange of gases and excretion of ammonia. b. of defense. c. for movement. d. that produce the skeletal elements.
The number of copies of a DNA sequence produced by the polymerase chain reaction depends on the
number of cycles of the reaction. Indicate whether the statement is true or false.
The ____ is involved in forming the lateral meristems that produce secondary growth in woody roots
a. endodermis b. periderm c. cortex d. vascular cambium e. pericycle
Selfishness should be seen more often between unrelated individuals unless 1) there are repeated opportunities to be a donor or recipient, 2) the cost to be a donor is relatively low, and 3):
a) kin selection is a factor. b) altruistic donors are not recognizable. c) cheaters are recognizable and punished for cheating. d) the benefits to the recipient are lower than the costs of the donor. e) two individuals are secretly related, but they don't know it.