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
C
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The parts of the graph indicated at points C, D, and E represent
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A) depolarization.
B) hyperpolarization.
C) the refractory period.
D) repolarization.
E) sodium channel activity.
The excretory structures of annelids are referred to as
A. flame cells. B. kidneys. C. protonephridia. D. metanephridia. E. malpighian tubules.
A mutation that adds one or two bases to a gene disrupts the
A) replicating frame. B) intron index. C) genetic code. D) reading frame.
Muscle fibers are ____ when you are looking at something far away
Fill in the blank(s) with the appropriate word(s).