The polynucleotide chain of DNA has polarity: the 5¢ end has a bound ____, while the 3¢ end has a bound ____
a. deoxyribose sugar, ribose sugar
b. adenine, thymine
c. cytosine, guanine
d. hydroxyl group, phosphate group
e. phosphate group, hydroxyl group
ANSWER: e
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Why has Atlantic cod evolved to mature at a younger age and smaller size?
a. DNA damage from radiation released accidentally from nuclear power plants b. unknown causes c. food competition from other predatory fish d. intraspecies competition e. overexploitation by fishing
Which animals are radially symmetrical?
a. annelids b. arthropods c. cnidarians d. roundworms e. flatworms
The first fossil evidence of vascular tissue is seen in the
A. tree ferns. B. rhyniophytes. C. bryophytes. D. green algae. E. tracheophytes.
Microsatellites are short sequences of DNA that consist of several two- or three- nucleotide motifs repeated in tandem (e.g., AATAATAAT or GAGAGAGAGAGA). Each allele consists of a different number of repeats. Microsatellites are typically not under selection, and they are inherited through Mendelian inheritance. Given this information, which of the following questions might you answer with the use of microsatellites?
A) whether a gene is dominant or recessive B) whether your child will be blonde- or brown-haired C) whether two puppies were sired by the same father D) whether your canary died of a viral or bacterial infection E) whether a human fetus is male or female