The number and timing of _____ dictate if an action potential will occur.
a. Synapses
b. Postsynaptic potentials
c. Excitatory postsynaptic potentials
d. Inhibitory postsynaptic potentials
Answer: c. Excitatory postsynaptic potentials
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Which of the following is a reason for the occurrence of a lag phase in a bacterial growth curve?
A. The medium may be different from the previous growth medium so that the cells must synthesize new enzymes to use different nutrients. B. The cells may be old and depleted of ATP, essential cofactors, and ribosomes that must be synthesized before growth can begin. C. The organisms may have been injured and require time to recover. D. All of these are potential reasons.
The first eukaryotic fossils are dated to about
a. 3.8 billion years ago. b. 2.1 billion years ago. c. 1.5 billion years ago. d. 750 million years ago. e. 201 million years ago.
Somatic sensations include all of the following EXCEPT
a. heat and cold b. pressure and touch c. pain d. limb movements and the position of the body in space e. sound
The Southern Blot technique enables detection of specific sequences
A. of sugars in polysaccharides. B. in RNA. C. of amino acids in proteins. D. in DNA.