Cataracts occur when the lens becomes opaque. Which symptoms most likely would be present in a patient with this
condition?
a. increased intraocular pressure
b. enlarged pupil
c. eye pain
d. blurred vision
e. headache
ANSWER: d
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If rice could be bioengineered to contain more carotene, which is a precursor to vitamin A, what worldwide health problem could be improved?
a. AIDS b. malaria c. rickets d. goiter e. blindness
In a typical mammalian cell, the concentration of _______ is higher on the inside, and the concentration of _______ is higher on the outside.
a. Na+ and Cl-; K+ b. Na+; K+ and Cl- c. K+; Na+ and Cl- d. K+ and Cl-; Na+
A new virus is discovered that causes cells to lyse. Which of the following types of assay would be useful for diagnosing infection with this virus?
A) agglutination B) complement fixation test C) viral hemagglutination D) both agglutination and complement fixation tests E) viral neutralization
In rabbits, spotted coat (S) is dominant to solid color (s) and black (B) is dominant to brown (b). A true-breeding black spotted rabbit is mated to a true-breeding brown solid rabbit to produce a heterozygous F1 generation. Two F1 individuals are mated, and you do not see a 9:3:3:1 (black spotted: black solid: brown spotted: brown solid) ratio of offspring, but instead see that almost all offspring are a non-recombinant phenotype. This tells you that
A. that the genes for fur pattern (spotted vs. nonspotted) and fur color are on the same chromosome. B. that the genes for fur pattern (spotted vs. nonspotted) and fur color assort independently. C. that fur pattern (spotted vs. nonspotted) and fur color are maternally inherited. D. that the genes for fur pattern (spotted vs. nonspotted) and fur color are on the X-chromosome and Y-chromosome, respectively. E. that the genes for fur pattern (spotted vs. nonspotted) and fur color are on different chromosomes.