Which of the following is not true of enzyme behavior?
1.Enzyme shape may change during catalysis.
2.Enzymes cannot make something happen that would not happen on its own.
3.All enzymes have an active site where substrates are temporarily bound.
4.Each enzyme can catalyze a wide variety of different reactions.
5.Enzymes speed up reactions.
4
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The bacteria that appear to maintain balance between the members of the normal microbiota and play a vital role in limiting colonization by pathogens are
A. staphylococci. B. diptheroids. C. Candida spp. D. Malassezia spp.
Why does blood flow through capillaries at a much slower rate than through the aorta?
a. Capillaries are much narrower than the aorta and provide much more friction which reduces flow to nearly zero. b. Blood flow through capillaries is reduced dramatically due to the effect of gravity on individual red blood cells. c. The combined diameter of all capillaries is larger than the aorta, which results in a commensurate reduction in flow velocity. d. Blood flowing through capillaries is deoxygenated, providing less energy for precapillary sphincters to pump blood.
These white blood cells are in interstitial fluid,
phagocytize almost everything except uninjured body cells, and secrete cytokine which alerts the adaptive immune system to threats. These white blood cells are
a. neutrophils. b. macrophages. c. T lymphocytes. d. dendritic cells. e. eosinophils
A DNA molecule is made up of:
a. lipids b. proteins c. nucleotides d. fatty acids e. carbohydrates