Plant hormones known as __________ stimulate mitosis
a. gametophytes
b. kinesin and dynein
c. cytokinins
d. colchicines
e. kinetochores
C
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If all offspring of a cross have the same
heterozygous genotype, the parents of the cross would most likely be
a. homozygous dominant and homozygous recessive. b. both heterozygous. c. heterozygous and homozygous recessive. d. homozygous dominant and heterozygous. e. both homozygous dominant.
In a tube-within-a-tube body plan, what forms the outer tube?
a. the body wall b. the wall of the gastrovascular cavity c. the vacuolar membrane d. the intestinal wall e. the gizzard wall.
Which of the following can produce a population of individuals with a relatively high frequency of a harmful or rare allele?
a. mutation b. natural selection c. the founder effect d. artificial selection e. migration between large populations
Which biome has the shortest growing season?
a. tundra b. taiga c. grassland d. desert e. tropical rain forest