Some drugs mimic a neurotransmitter's effect on a postsynaptic cell. For example, morphine and heroin bind to receptors for:
a. acetylcholine.
b. dopamine
c. adenosine
d. serotonin
e. endorphins
e
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Which of the following statements best explains why microbial geneticists initially focused on regulation of gene expression at the transcriptional, rather than the translational, level?
A. The process of transcription was best understood by researchers at the time. B. The process of synthesizing an mRNA transcript is much less complex than translation of mRNA into protein. C. Cellular regulation of transcription is common to all prokaryotic cells. D. By regulating the first step of protein synthesis, cells conserve the greatest amount of energy.
Explain what happens at the molecular level when a salt such as NaCl dissolves in water
What will be an ideal response?
Which of the following is a disadvantage of an
exoskeleton? a. It must be shed for its owner to grow. b. It does not provide as efficient a muscle anchorage as an endoskeleton. c. It allows for excess water loss. d. It is not flexible enough to allow a full range of movement. e. It is not able to absorb pigments for sufficient camouflage.
Which of the following is an increase in blood flow?
a. Ischemia b. Hyperemia c. Septicemia d. Leukocytosis