Chemical equilibrium is relatively rare in living cells. An example of a reaction at chemical equilibrium in a cell would be _____
A) one in which the free energy at equilibrium is higher than the energy content at any point away from equilibrium
B) one in which the entropy change in the reaction is just balanced by an opposite entropy change in the cell's surroundings
C) an endergonic reaction in an active metabolic pathway where the energy for that reaction is supplied only by heat from the environment
D) a chemical reaction in which both the reactants and products are not being produced or used in any active metabolic pathway at that time in the cell
D
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Which of the following is produced by adding 1% to 5% agar to nutrient broth that is then boiled and cooled?
A. A contaminated medium B. A liquid medium C. A pure culture D. A mixed culture E. A solid medium
Four of the five answers listed below are chromosomal abnormalities. Select the exception
a. translocation b. elongation c. duplication d. deletion e. inversion
Besides the ability of some cancer cells to overproliferate, what else could logically result in a tumor?
A) changes in the order of cell cycle stages B) lack of appropriate cell death C) inability to form spindles D) inability of chromosomes to meet at the metaphase plate
Which of the following does not occur during early cleavage of a frog zygote?
A) The developing cell undergoes mitosis. B) The nuclear-to-cytoplasmic ratio of the two resulting cells increases. C) The ratio of surface area to volume of the two resulting cells increases. D) The embryo grows significantly in mass. E) The developing cell undergoes cytokinesis.