In an amphibian embryo, a band of cells called the neural crest
A) rolls up to form the neural tube.
B) develops into the main sections of the brain.
C) produces cells that migrate to form teeth, skull bones, and other structures in the embryo.
D) has been shown by experiments to be the organizer region of the developing embryo.
E) induces the formation of the notochord.
Answer: C) produces cells that migrate to form teeth, skull bones, and other structures in the embryo.
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In your Drosophila laboratory, you find a larva that is missing segments Lb, T1, T2, and T3. This larva probably has a mutation in a ___________ gene.
A. pair-rule B. gap C. maternal effect D. segment-polarity E. gap or segment-polarity
Which of the following is not a characteristic of cancerous cells?
A) immortality B) contact inhibition C) unusual shapes and sizes D) All of the above are characteristics of cancerous cells.
Parietal cells secrete:a
chyme and HCl. b. pepsin and chyme. c. pepsinogen and HCl. d. HCl and intrinsic factor. e. mucus and intrinsic factor.
Which is an example of acquisition of artificial passive immunity?
A) a baby who received antibodies from the mother?s breast milk B) a fetus protected from disease by its mother?s antibodies C) a person who received tetanus antiserum after stepping on a rusty nail D) a person who acquired the chickenpox E) a person who received his or her yearly influenza vaccine