Each DNA strand serves as a _____during DNA synthesis
a. replicate
b. substitute
c. template
d. source of nucleotides
e. primer
ANSWER: c
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Most human embryos that are aneuploid
A. result in Down's syndrome. B. result in sterility. C. are spontaneously aborted in the first trimester. D. can develop and survive to adulthood. E. are usually the result of increased nondisjunction in the gametes of older men.
The most common type of joint in the human body is a ____
a. synovial joint b. fibrous joint c. membranous joint d. cartilaginous joint e. hinge joint
It was important that Mendel examined not just the F1 generation in his breeding experiments, but the F2 generation as well, because
A) he obtained very few F1 progeny, making statistical analysis difficult. B) parental traits that were not observed in the F1 reappeared in the F2. C) analysis of the F1 progeny would have allowed him to discover the law of segregation, but not the law of independent assortment. D) the dominant phenotypes were visible in the F2 generation, but not in the F1. E) many of the F1 progeny died.
Fleas and springtails both lack wings
a. Because they never evolved wings and are both primitive insects b. Because they are both parasites and lost wings from winged ancestors c. Fleas are primitive but springtails lost wings when they gained their springtails d. Springtails never had wings but fleas are derived from winged fly-like ancestors and secondarily lost wings when they became parasites e. None of the choices are correct