The general types of membrane proteins are:
A. single pass proteins, multipass proteins, and peripheral proteins
B. multipass proteins, lipid anchored proteins, and single pass proteins
C. multipass proteins, lipid anchored proteins, and peripheral proteins
D. peripheral proteins, integral proteins, and lipid anchored proteins.
E. peripheral proteins, integral proteins, and enzymes
Ans: D. peripheral proteins, integral proteins, and lipid anchored proteins.
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Oxytocin and cholecystokinin are transported through the bloodstream and arrive at the uterus at the same time. Oxytocin causes the uterus to contract, whereas cholecystokinin has no effect. Why?
A. The uterus has receptors for oxytocin, but not for cholecystokinin. B. Oxytocin blocks the activity of cholecystokinin. C. Oxytocin alters gene expression patterns, whereas cholecystokinin does not. D. Oxytocin is able to diffuse through the plasma membrane of uterine cells, whereas cholecystokinin cannot. E. Oxytocin is at a higher concentration in the bloodstream than cholecystokinin.
Point mutations in the DNA sequence don't cause:
A. silent mutations. B. missense mutations. C. nonsense mutations. D. frameshift mutations. E. transversion mutations.
Many scientists feel that we are headed toward another mass extinction because of man's actions and our effect on the ecosystem Earth. What have we learned from previous mass extinctions that may provide an idea of the consequences of such a mass extinction? What should man do to try to prevent such an occurrence?
What will be an ideal response?
A PillCam traveling from the pharynx to the stomach will first pass through the ________
A) esophagus B) sphincter C) tonsil D) uvula