Growth factors stimulate
A) the cell to skip the S and G1 phases of interphase and undergo mitosis directly.
B) cells to divide.
C) the cell to ignore the checkpoints of the cell cycle.
D) Cdks to synthesize enzymes that digest cyclins.
B
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The fungus Drechslerella anchonia, a carnivorous fungus that forms sacs containing eight spores, belongs to the phylum
A. Chytridiomycota. B. Deuteromycota. C. Zygomycota. D. Basidiomycota. E. Ascomycota.
Both existing mammals and extinct mammal-like
groups are a. synapsids. b. archosaurs. c. sauropsids. d. anapsids. e. pleiosaurs.
Because it is polyploid, the organism with the highest number of genes is
A. yeast. B. human. C. raccoon. D. pufferfish.
In a plasmid vector, the purpose of the lacZ gene is
a. to allow replication of the plasmid. b. to allow selection of transformed bacterial cells. c. to allow the plasmid to be cut once for cloning a fragment. d. to protect the plasmid from digestion by exonucleases. e. as an indicator that the plasmid is recombinant, containing a DNA insert.