By their experimentation using the Neurospora fungus, Beadle and Tatum were able to propose the far-reaching hypothesis that ________
A) prototrophs will grow only if provided with nutritional supplements
B) the role of a specific gene is to produce a specific enzyme
C) genetic recombination occurred in Neurospora
D) more than one codon can specify a given amino acid
E) several different enzymes may be involved in the same step in a biochemical pathway
Answer: B
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Two species of salamander have similar ranges, but one breeds from January to March, while the second one breeds from March to May. This is an example of
A. mechanical isolation. B. temporal isolation. C. habitat isolation. D. behavioral isolation. E. gametic isolation.
At __________, the fusion of two gametes produces
a __________. Fill in the blank(s) with the appropriate word(s).
In which of the following processes do the chromosome and its homologous partner exchange corresponding pieces of DNA?
A. Crossing over B. Gametes C. Alleles D. Haploid E. Germ cell
The (leading/lagging/replicating) strand is the DNA strand that is synthesized continuously during DNA replication
What will be an ideal response?