What is the general function of enzymes within a cell?
A) to promote the synthesis of monomers
B) to induce chemical reactions
C) to stop chemical reactions
D) to speed up chemical reactions
Answer: D
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Attenuated agents are
A. dead viruses. B. toxins. C. weakened but replicating microbes. D. parts of an organism.
WT yeast (TRP+) can synthesize the amino acid tryptophan and can grow on media plates lacking tryptophan
In contrast, mutant alleles (trp?) block tryptophan synthesis and result in an inability of mutant strains to grow on media lacking tryptophan. A diploid yeast was made through the cross MATa ADE+ × MAT? ade?. Meiosis was induced in the diploid strain to produce an ascus with four haploid spores, which were separated and grown on plates lacking tryptophan. How many spores are expected to grow into colonies on the plate? A) 0 B) 1 C) 2 D) 3 E) 4
Each pollen grain produces two cells, one of which may develop into a(n):
a. polar nucleus. b. pollen tube. c. anther. d. compound pistil. e. filament.
The formation of offspring carrying genetic information from a single parent is called
A) asexual reproduction. B) sexual reproduction. C) regeneration. D) spontaneous generation. E) All of these