Under which of the following situations would receptor down-regulation most likely occur?
a. The concentration of a neurotransmitter is too low.
b. The concentration of a hormone is too high.
c. The number of receptors in the plasma membrane is too low.
d. The number of G proteins is too high.
e. The cell is unable to manufacture cyclic AM
B
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Species of the genus Gardnerella ________.
A. are motile spore-forming cocci B. are thought to be a major cause of bacterial vaginitis C. are normal flora found on the skin of humans D. All of the choices are correct.
Blood samples are taken from the heel of newborn babies to test for a mutation in the PKU gene, which, if left untreated and in severe cases, can lead to mental retardation, reduced skin pigmentation, and seizures. Which concept is being illustrated by
this example? A) incomplete dominance B) polygenic inheritance C) pleiotropy D) codominance
Describe the mechanism of feedback inhibition and the role this process plays in controlling enzyme activity
What will be an ideal response?
Which of the following is not an effect of global warming?
A. wetter coastal regions B. expansion of forests in the temperate zones C. melting of glaciers D. rise in sea level E. flooding of coastal agricultural land