A gene that produces multiple effects is called
a. a multiple allele.
b. an autosome.
c. an epistatic gene.
d. a pleiotropic gene.
e. an incompletely dominant gene.
D
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Ecologists are concerned about amphibian populations because
A. their loss would be an aesthetic loss to the planet. B. of the possibility of numerous medicinal uses. C. they are keystone species in many areas—their loss will cause other populations to crash. D. amphibians are very sensitive to environmental change—they may be indicating serious problems. E. they are increasing to the point of competing with indigenous species.
Researchers discovered an enzyme in HIV called protease. Once the enzyme's structure was known, researchers began looking for drugs that would fit into the active site and block it
HIV is the virus that causes AIDS. In the mid-1990s, A) vaccination B) denaturation C) allosteric regulation D) competitive inhibition
Transcription factors generally "read" DNA sequences through amino acid–nucleotide contacts in the major groove because:
A. there are no minor groove hydrogen bond acceptors available at A–T base pairs. B. the minor groove displays only methyl functional groups for recognition. C. there are more hydrogen bond donors and acceptors in the major groove. D. all minor groove functional groups are the same.
The atomic number of an element is the number of
A. protons in the orbitals. B. electrons in the nucleus. C. neutrons in the orbitals. D. protons in the nucleus. E. neutrons in the nucleus.