Each of the following is a second messenger except
A) cyclic adenosine monophosphate.
B) inositol trisphosphate.
C) diacylglycerol.
D) epinephrine.
E) calcium ions.
Answer: D
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12C, 13C, and 14C are all isotopes of carbon. They differ in their
a. overall charges. b. number of electrons. c. number of protons. d. number of neutrons. e. electron energy shells.
A typical amniote has ____, but fish do not
a. a backbone b. waterproof skin c. gills d. external fertilization e. a cartilaginous skeleton
The cow Bos primigenius (which is bred for meat and milk) has a smaller brain and larger eyes than closely related wild species of ungulates. These traits most likely arose by _____
A) natural selection, because these traits evolved in the population over time B) natural selection, because these traits were not consciously selected by humans C) artificial selection, because changes in these traits co-occurred with human selection for high milk output and high muscle content D) artificial selection, because these animals differ from their close relatives and common ancestor
During which phase of mitosis do the centromeres line up along the cell equator?
A) Anaphase B) Prophase C) Metaphase D) Telophase