The distinctive mating signals that have evolved as part of an animal's courtship illustrate what type of reproductive
isolating mechanism?
a. gametic isolation
b. temporal isolation
c. behavioral isolation
d. mechanical isolation
e. communicative isolation
c
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Which of the following statements is true regarding secondary growth in vascular plants? Select all correct choices
A. Secondary growth depends only on the vascular cambium. B. Secondary growth depends only on the cork cambium. C. Secondary growth depends on both the vascular and cork cambia. D. Secondary growth causes a plant to grow in diameter (not height). E. Secondary growth causes a plant to grow in height (not diameter).
Virulence may be measured experimentally at the host level by the ________, which measures the number of pathogens that kills 50% of an experimental group of hosts within a specified amount of time.
Fill in the blank(s) with the appropriate word(s).
Codons are three-base sequences that specify the addition of a single amino acid. How do eukaryotic codons and prokaryotic codons compare?
A) Prokaryotic codons usually contain different bases than those of eukaryotes. B) Prokaryotic codons usually specify different amino acids than those of eukaryotes. C) The translation of codons is mediated by tRNAs in eukaryotes, but translation requires no intermediate molecules such as tRNAs in prokaryotes. D) Codons are a nearly universal language among all organisms.
Which of the following statements about the Hershey-Chase experiment is false?
A) The virus-infected bacteria showed radioactive phosphorus. B) Protein was labeled with radioactive sulfur. C) The virus-infected bacteria contained radioactive sulfur. D) DNA was labeled with radioactive phosphorus.