The most important finding from the fossil record which supports the theory of evolution is:
a. that life has evolved over time.
b. that life evolved in the ocean.
c. that most species are extinct.
d. that ancient species differed from those alive today.
e. the inaccuracy of the fossil record.
A
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What was an early selective advantage of a coelom in animals? A coelom _____
A) contributed to a hydrostatic skeleton, allowing greater range of motion B) was a more efficient digestive system C) allowed cephalization and the formation of a cerebral ganglion D) allowed asexual and sexual reproduction
In gene expression, ________
A) DNA directs the synthesis of a polypeptide that directs the synthesis of RNA B) RNA determines the sequence of DNA, which directs the synthesis of polypeptides C) DNA directs the synthesis of RNA that directs the synthesis of a polypeptide D) polypeptides direct the synthesis for both RNA and DNA
Following double fertilization, the ovule develops into __________, and the ovary develops into
__________. a. a cotyledon; an embryo b. an embryo; a seed c. a seed; a fruit d. a fruit; a seed e. an endosperm; an embryo
If two alleles exist for a characteristic (A and a) and allele 'a' is lethal in homozygous individuals,
A. the frequency of the 'a' allele will remain constant. B. the 'a' allele will be eliminated from the population. C. the ‘a' allele is not likely to be eliminated from the population. D. the frequency of the 'a' allele will increase.