Which one of the following is characteristic of N. meningitidis but not N. gonorrhoeae?
A. Ferments glucose
B. Contains a polysaccharide capsule
C. Is oxidase-positive
D. Most isolates show resistance to penicillin
E. No effective vaccines are available
Ans: B. Contains a polysaccharide capsule
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The early cell divisions of human development differ from other mitotic cell divisions in that:
A. cells do not replicate all chromosomes prior to dividing; this helps the cells differentiate. B. cells do not grow in size; they subdivide the cytoplasm of the fertilized egg. C. cells move as they divide. D. they are unequal; some daughter cells are much larger than others. E. All of these choices are correct.
The ability to determine where a sound is coming from depends primarily on
A. differences in sound intensity in the two ears. B. differences in time of sound arrival to the two ears. C. differences in sound frequency received at the two ears. D. differences in both frequency and intensity at the two ears. E. None of these choices are correct.
Which factor is important for maintaining the different germ cell layers in the developing embryo? [Hint: without this molecule the embryo would be a ball of cells with no distinct germ cell layers.]
A. activin B. noggin C. Spemann's organizer D. Hox gene E. cadherins
Otto Loewi demonstrated that neurons transmit signals across synapses by ____
a. electrical signals b. calcium channels c. acetylcholine d. chemical signals e. proteins