What must pyruvic acid be converted to before it can enter the citric acid cycle?
A) acetyl CoA
B) lactic acid
C) ethyl alcohol
D) citric acid
A
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Which objective would be best to use a Southern blot rather than a Northern blot?
A) Determine if a gene is present in a genome. B) Discover gene function. C) Identify regulatory gene-protein interactions. D) Quantify expression profiles of a gene.
Many snake venoms contain an acetylcholinesterase inhibitor. Predict what effect the presence of this toxin would have on muscles
A. There would be no effect. Acetylcholine is the ligand. B. Muscles would be prevented from contracting. C. Muscles would lose their ability to contract due to the loss of membrane potential. D. Muscles would contract uncontrollably.
During the initiation of nitrogen-fixation nodules, a host plant with genetic mutations releases altered forms of flavonoids. What is the likely consequence of this?
A. Infection threads will grow in the wrong direction. B. More nodules will form than necessary. C. The bacteria will not produce any Nod factors. D. Nodules will be misshapen. E. The bacterial will produce higher levels of Nod factors.
If the gene pools of allopatric populations did not differentiate much during geographical separation, then upon
reestablishing contact, the populations may interbreed and merge into one. This phenomenon is called ____.
a. species clustering b. divergence c. hybridization d. species fusion
e. convergence