The two strands of a DNA molecule are held together by ________
a. phosphodiester linkages
b. covalent bonds
c. peptide bonds
d. hydrogen bonds
d
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Four of the five structures listed below produce
components of semen. Select the exception. a. epididymis b. prostate c. seminal vesicle d. bulbourethral gland e. testes
The first successful outcome of gene therapy was in a case of a young girl suffering from
____________________ who was supplied with copies of the ADR gene. Fill in the blank(s) with the appropriate word(s).
How do phospholipids interact with water molecules?
A) The polar heads avoid water; the nonpolar tails attract water (because water is polar and opposites attract). B) Phospholipids do not interact with water because water is polar and lipids are nonpolar. C) The polar heads interact with water; the nonpolar tails do not. D) Phospholipids dissolve in water.
Analogous features are problematic when constructing evolutionary tree because they are
a) based on DNA instead of comparative anatomy b) based on comparative anatomy instead of embryology c) monophyletic instead of convergent d) the result of common ancestry instead of natural selection e) the result of natural selection instead of common ancestry