In healthy adult humans, normal systolic pressure is ____ mm Hg and normal diastolic pressure is ____ mm Hg
a. 20 to 50; 5 to 20
b. 60 to 80; 90 to 120
c. 90 to 120; 60 to 80
d. 90 to 120; 130 to 150
e. 130 to 150; 90 to 120
ANSWER: c
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What effect does light have on retinal?
a. causes retinal to vibrate and warm up b. induces retinal to emit a high-energy photon c. transforms it from cis retinal to trans retinal d. decomposes retinal into rhodopsin and an opsin
In pedigree charts, autosomal dominant disorders are expressed in heterozygotes. Therefore, the disorders are typically
A. occur every third generation. B. appear in every generation. C. appear only in males. D. appear only in females. E. seem to disappear in one generation, only to reappear in the next generation.
Action potentials
a. can move up or down an axon, away from or towards the cell body. b. move in a one way direction towards the cell body . c. move in a one way direction away from the cell body. d. can jump from cell to cell. e. do none of these.
Two healthy parents (asymptomatic) have a child with Tay-Sachs disease. Which of the following best explains this phenomenon and its possible screening?
The phenomenon occurred because the parents are both carriers of the gene for the disease, but with screening of the parents combined with genetic counseling and embryo testing, the phenomenon could have dramatically been reduced. The phenomenon occurred because both parents were gene carriers, but there is no testing available at this point for a disease such as Tay Sachs. The phenomenon occurred because the dominant Tay-Sachs gene was active in the child, but not in the parents. This phenomenon is not possible, since both parents are asymptomatic. The phenomenon occurred due to a point mutation that occurred during fertilization, but testing could have informed the parents of the disease in their unborn child.