Starting from the wild mustard Brassica oleracea, breeders have created the strains known as Brussels sprouts, broccoli, kale, and cabbage. Therefore, which of the following statements is correct?
A) In this wild mustard, there is enough heritable variation to permit these different varieties.
B) Heritable variation is low in wild mustard—otherwise this wild strain would have different characteristics.
C) Natural selection is rare in wild populations of wild mustard.
D) In wild mustard, most of the variation is due to differences in soil or other aspects of the environment.
A
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After 30 cycles of PCR cloning of a segment
of DNA, how many copies of that segment will there be?
a. 1000 b. 10,000 c. 100,000 d. 1,000,000 e. 1,000,000,000
Paralytic shellfish poisoning occurs when ________ are eaten by humans or marine mammals
A) euglenids B) diplomonads C) diatoms D) excavates E) dinoflagellates
Several chemical properties make water uniquely suited for its role as a central "molecule of life." Which of the following is FALSE?
A. Hydrogen bonding leads to high cohesiveness between water molecules. B. Water resists temperature changes. C. Water is always polar. D. The structure of a water molecule is stabilized by hydrogen bonds. E. Water is a good solvent of polar molecules and ions.
In the Hardy-Weinberg equation, the letters p and q represent
A. frequencies of alleles in a population. B. the number of individuals of different phenotypes in a population. C. the number of individuals of different genotypes in a population. D. the frequencies of individuals of different genotypes in a population. E. the square of individuals of different genotypes in a population.