Members of which phylum are called acorn worms?
a. Hemichordata
b. Echinodermata
c. Arthropoda
d. Cnidaria
Ans: a. Hemichordata
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Analysis of many Drosophila maternal effect genes reveals that many are involved in:
a. female morphogenesis. b. programmed cell death. c. forming specific segments in the embryo. d. nonspecific differentiation. e. determining the polarity of the embryo.
All of the following statements about neurotransmitters are generally true EXCEPT:
(A) They may cause depolarization or hyperpolarization of the postsynaptic membrane. (B) They are actively transported across the synaptic cleft. (C) They are released from membrane-bound packets called vesicles. (D) They may be enzymatically degraded at the postsynaptic membrane. (E) They bind to specific receptors on the postsynaptic membrane.
Which of the following is associated with the terms cuticle, guard cells, stomata, and trichomes?
a. ground tissue b. meristem c. vascular tissue d. dermal tissue
Which part of the seed produces hydrolytic enzymes that break down the starchy endosperm during seed germination?
A. Amyloplasts B. Coleorhiza C. Aleurone layer D. Scutellum E. Plumule