The protostomes are divided into two monophyletic groups, the
A. Lophotrochozoa and Ecdysozoa
B. Protostomia and Deuterostomia
C. Chordata and Hemichordata
D. Eumetazoa and Protozoa
A
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J.D., a black Labrador retriever, is heterozygous (Bb) for coat color, where B is black and b is brown. J.D. therefore has a black coat. Bb is J.D.'s
A) genotype. B) hemizygous state. C) gene conversion. D) phenotype. E) homozygous state.
A seed is a _____
a. female gametophyte c. mature pollen grain b. mature ovule d. modified microspore
The most common control mechanism to prevent overproduction or underproduction of hormones is
a. positive feedback. b. opposing interaction. c. negative feedback. d. synergistic interaction. e. permissive interaction.
The "stress hormone" involved in stomatal closure during water stress is:
a. abscisic acid. b. auxin. c. cytokinin. d. ethylene. e. gibberellin