Answer the question using the accompanying figure. In the diagram of a root tip, the structure labeled "1" is the ____
a. quiescent center
b. zone of cell division
c. zone of elongation
d. root cap
e. zone of maturation
ANSWER: e
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The production of cyclic AMP in Dictyostelium results in
a. sexual reproduction. b. cell division. c. swimming. d. spore production. e. aggregation of cells.
What would be the net ?G for the coupling of these two reactions?
For a particular cell at 25°C, the concentration of sucrose is 10 mM on the inside of the cell and 0.5 mM on the outside, whereas the concentration of sodium ions (Na+) is 0.5 mM on the inside of the cell and 10 mM on the outside. The membrane potential is -150 mV. Constants: R = 1.987 cal/mol-K; T = 25°C = 298 K; F = 23,062 cal/mole-volt A) +7.007 kcal/mol B) +3.459 kcal/mol C) ?1.774 kcal/mol D) ?3.459 kcal/mol E) ?7.007 kcal/mol
Viruses are characterized by all of the following except
A. being specific to the hosts they infect. B. being acellular. C. being capable of independent reproduction. D. being found in every organism investigated so far.
After consuming an antacid like Rolaids, ________.
A. HCl production would decrease B. the stomach would absorb water C. the pH of the stomach fluid would decrease D. the pH of the stomach fluid would increase