Members of which phylum are called acorn worms?

a. Hemichordata
b. Echinodermata
c. Arthropoda
d. Cnidaria


Ans: a. Hemichordata

Biology & Microbiology

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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.

Biology & Microbiology

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.

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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

Biology & Microbiology

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

Biology & Microbiology