. A bell-shaped curve of phenotypic variation is indicative of
a. incomplete dominance.
b. continuous variation.
c. multiple alleles.
d. epistasis.
e. environmental variables on phenotypes.
ANSWER: b
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In tigers, a recessive allele causes a white tiger (absence of fur pigmentation). If one phenotypically normal tiger that is heterozygous is mated to another that is phenotypically white, what percentage of their offspring is expected to be white?
A) 50% B) 75% C) 0% D) 100% E) 25%
With one exception, species of the genus Haemophilus require which of the following media ingredients for in vitro growth?
a. Vitamin K and hemin b. Hemin and nicotine adenine dinucleotide (NAD) c. Vitamin K and NAD d. Hemin and cysteine
During the day in most plants
a. carbon dioxide accumulates in leaf cells. b. turgor pressure in the guard cells decreases. c. water and potassium move into the guard cells. d. the guard cells wilt. e. water is conserved.
Disulfide bonds are often found to stabilize which of the following levels of protein structure?
A) primary B) secondary C) tertiary D) primary, secondary, and tertiary E) None of these structures involve disulfide bonds.