What first happens to the two-carbon molecule, acetyl CoA, as it enters the Krebs cycle?
A. It joins with pyruvate to form a four-carbon sugar.
B. It joins with another acetyl CoA molecule to form a six-carbon sugar.
C. It is reduced to form carbon dioxide.
D. It is activated with a phosphate from ATP.
E. It is combined with a four-carbon sugar to form a six-carbon sugar.
E. It is combined with a four-carbon sugar to form a six-carbon sugar.
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Geraldo isolated an E. coli strain in which a mutation has hampered the capacity of the cAMP activator to bind the promoter of the lactose operon. How will this mutation affect transcription of the lactose operon when the E. coli cells are exposed to the following conditions?
a. Lactose and glucose are both available. b. Lactose is available but glucose is not. c. Both lactose and glucose are absent.
Leukemia is a type of cancer that involves the uncontrolled division of ____________________ cells. Fill in the blank(s) with the appropriate word(s)
Chemical defenses are found in all of the following except
A. Batesian mimics. B. snakes, spiders, and fishes. C. marine animals. D. plants. E. insects.
Which type of reproduction is most commonly found among the fungi?
A. sexual reproduction between two different mating types and production of haploid spores B. sexual reproduction in which two haploid cells fuse, forming a dikaryotic cell whose nuclei fuse (karyogamy) and then produce haploid spores C. asexual reproduction in which the haploid parent forms haploid spores D. asexual reproduction in which the haploid parent produces diploid spores