Resident biota (normal flora) of human beings include members of the
A) bacteria.
B) arthropods.
C) fungi.
D) all of the above.
Answer: D) all of the above.
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The target of a site-specific recombinase consists of:
A. one short, asymmetric core sequence; two inverted-repeat binding sites; and one cleavage site. B. one short, asymmetric core sequence; two direct-repeat binding sites; and one cleavage site. C. two short, asymmetric core sequences; two inverted-repeat binding sites; and one cleavage site. D. one short, palindromic core sequence; two inverted-repeat binding sites; and one cleavage site. E. one short, palindromic core sequence; two direct-repeat binding sites; and one cleavage site.
Geneticists designate heritability as "narrow" or "broad" to account for the fact that
A) genes contribute to different degrees. Typically, recessive alleles are rare and can have a large impact and dominant alleles tend to be common with minor but additive effects. B) genes contribute to different degrees. Typically, dominant alleles are rare and have a small impact and recessive alleles tend to be common, each with major effects. C) genes contribute to different degrees. Typically, dominant alleles are rare and can have a large impact and recessive alleles tend to be common with minor but additive effects. D) dominant and recessive alleles have equal impact, but dominant alleles are more common than recessive alleles.
Which group of algae are a commercial source of agar and carrageenan?
a. red algae b. brown algae c. dinoflagellates d. euglenoids e. green algae
Biologists are studying two species whose DNA is known to differ by 10%. Which information would be least important in calibrating a molecular clock to determine how rapidly evolution has proceeded with these two species?
A) the fossil record of these two species B) a geological event that separated the species at a particular time C) the function of each of these regions of DNA D) the time of divergence of closely related species