Select all of the X-linked conditions from the choices.
a. Fragile X syndrome
b. Down syndrome
c. muscular dystrophy
d. color-blindness
Ans:
a. Fragile X syndrome
c. muscular dystrophy
d. color-blindness
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Which of the following organisms is
responsible for the production of cheese, yogurt, and sour cream?
a. Lactobacillus b. Saccrharomyces c. Clostridium d. E. coli e. more than one of these
One characteristic that makes Caenorhabditis elegans attractive for developmental studies is:
a. its small, transparent body. b. the extensive number of genes shared with humans. c. the developmental defects that occur in this organism. d. the close evolutionary relationship between this mammal and humans. e. the presence of zygotic segmentation genes, similar to those found in humans.
How do we perceive the pitch of sounds?
A) The hammer, anvil, and stirrup vibrate at different speeds. B) Different parts of the basilar membrane vibrate in response to different frequencies of sound. C) Rods vibrate in response to high-frequency sounds and cones respond to low-frequency sounds. D) The tympanic membrane vibrates more strongly at high frequencies. E) The pinna swivels in different directions in response to sounds of different frequency.
All of the following pertain to patients with AIDS, except
A) That have CD4 T-cell counts below 200 cells/mm3 of blood. B) The highest number of cases worldwide is in the United States. C) They get repeated, life-threatening opportunistic infections. D) They can get unusual cancers and neurological disorders. E) They have a profound immunodeficiency.