Which is NOT ordinarily capable of being reduced at
any time?
a. NAD+
b. FAD
c. oxygen, O2
d. water
e. all of these
Answer: d
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The production of pollen, seeds, and flowers attributed to the widespread distribution of angiosperms. Why is the production of pollen an advantage?
A. It allows fertilization in the absence of water. B. It allows fertilization in moist areas. C. It promotes pollination. D. It is necessary for sexual reproduction. E. It protects and nourishes the embryo.
Agar is produced by
a. brown algae. b. red algae. c. phycobilins. d. foraminiferans. e. brown and red algae.
A physical or chemical agent that changes the nucleotide sequence of DNA is called a(n)
A) terminator. B) prion. C) mutagen. D) anticodon.
In general, the organization of genes in bacteria is different from that in eukaryotes. In E. coli, approximately 27 percent of all genes are organized into contiguous, functionally related units containing multiple genes under coordinated control that
are transcribed as a single unit. Such contiguous gene families are called ________. A) operons B) transcriptomes C) proteomes D) pseudogenes E) contigs