All of the following may influence the rate of simple diffusion across a selectively permeable membrane EXCEPT the
A) concentration gradient.
B) size of the molecule.
C) lipid solubility of the molecule.
D) size of the cell.
E) temperature.
D
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One of the greatest advantages of sexual reproduction is the generation of variability
Indicate whether the statement is true or false.
Photorespiration
A. uses a 3-carbon sugar precursor to produce oxygen. B. tends to occur under dry and hot conditions. C. uses the enzyme PEP carboxylase rather than rubisco to produce 3-phosphoglycerate. D. occurs in C4 plants. E. requires CO2.
Many ribosome-inactivating proteins are not a
problem for humans because
a. we have enzymes to detoxify them. b. they are very rare in nature. c. they are sequestered by white blood cells. d. they are rapidly metabolized. e. they do not cross cell membranes very well
Hazardous waste is defined as waste that:
A.causes death in people or animals .B.cannot be decontaminated. C.is disposed of in open dumps. D.presents a health risk of some type.