Although glucose molecules constantly diffuse into a red blood cell along their concentration gradient, equilibrium is never reached and a steep concentration gradient is continually maintained. What causes this?
a. The active transport of glucose
b. The very fast turnover rate of glucose metabolism
c. The ability of the cell to engulf glucose by pinocytosis
d. The continuous excretion of glucose from other parts of the cell
e. The rapid and continuous addition of phosphates onto the glucose molecules
e
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Histones and DNA have a strong attraction for each other because
A) DNA is positively charged and histones are negatively charged. B) both DNA and proteins are hydrophobic. C) DNA is negatively charged and histones are positively charged. D) like substances share common charges.
Lichens are
a. parasitic interactions between a fungus and an alga. b. only found growing on living matter. c. symbiotic associations between a fungus and an alga. d. capable of causing some obscure diseases. e. insensitive to changes in the environment.
Which of the following causes the unwinding of the DNA double helix?
a. DNA polymerase b. DNA helicase c. RNA primer d. primosome e. RNA polymerase
The PCR technique requires a DNA polymerase from an organism that can endure high heat, such as Thermus aquaticus. What step of the protocol makes the heat-stability most necessary?
A. Synthesis B. Denaturation C. Primer annealing D. Antibody binding