As part of their normal function, many proteins bind to DNA briefly and then release it again. Which types of bonds might be involved in these transient protein-DNA interactions?
a. ionic
b. covalent
c. van der Waals forces
d. hydrogen
e. all of the above
f. a, c, and d
g. a, b, and c
Answer: f. a, c, and d
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(a) bones to bones. (b) skeletal muscles to bones. (c) ligaments to bones. (d) skeletal muscles to tendons.
When testosterone levels in a male are high
A. GnRH production is inhibited. B. FSH release is stimulated. C. LH release is inhibited. D. GnRH release is stimulated. E. both GnRH production and LH release are inhibited.
Morphological characteristics are widely used for taxonomic classifications because they are ____
a. the most likely indicators of evolutionary relationships b. the most likely to represent reproductive isolation among groups c. easy to assess in living, preserved, or fossilized specimens
d. always the exact phenotypic expression of genotypes e. indicative of genetic relatedness
Black bread mold is __________, which means that it is self-sterile
a. heterozygous b. heterothallic c. hetertrophic d. mycotoxic e. coenocytic