Upon the initial infection of a host cell by bacteriophage ?, the first two proteins produced from expression of the phage genome are:
A. cI and cII.
B. N and cI.
C. N and Cro.
D. Cro and cI.
C
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At which developmental stage should one be able to first distinguish a diploblastic embryo from a triploblastic embryo?
A) fertilization B) cleavage C) gastrulation D) coelom formation E) metamorphosis
After the drought of 1977, researchers on the island of Daphne Major hypothesized that medium ground finches that had large, deep beaks, survived better than those with smaller beaks because they could more easily crack and eat the tough Tribulus cistoid
es fruits. If this hypothesis is correct, what would you expect to observe if a population of these medium ground finches colonizes a nearby island where Tribulus cistoides is the most abundant food for the next 1000 years? Assume that (1) even the survivors of the 1977 drought sometimes had difficulty cracking the tough T. cistoides fruits and would eat other seeds when offered a choice; and (2) food availability is the primary limit on finch fitness on this new island. A) evolution of yet larger, deeper beaks over time B) evolution of smaller, pointier beaks over time C) random fluctuations in beak size and shape D) no change in beak size and shape
The nucleus of a neuron is found in the
a. axon. b. cell body. c. dendrites. d. myelin sheath. e. neuroglia.
During the Krebs cycle,
a. substrate-level phosphorylation occurs. b. oxaloacetate is regenerated. c. electrons and H+ are transferred to coenzymes NAD+ and FAD. d. molecules of carbon dioxide are formed. e. all of these occur.