Evolutionary adaptations for survival on land produced tetrapods, which later evolved into
A) amphibians only.
B) amphibians, reptiles, and mammals.
C) reptiles only.
D) birds only.
Answer: B
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Recent studies have shown that xeroderma pigmentosum (an error in the nucleotide excision repair process) can result from mutations in one of seven genes. What can you infer from this finding?
A) There are seven genes that produce the same protein. B) These seven genes are the most easily damaged by ultraviolet light. C) There are several proteins involved in the nucleotide excision repair process. D) These mutations have resulted from translocation of gene segments.
When does a species become classified as endangered?
a. when less than 100 remain b. when less than 500 remain c. when less than 1000 remain d. There are no definitive guidelines for classifying a species as endangered
Sexual dimorphism, as seen in the crayfish, is
a. the presence of male and female individuals. b. the production of eggs and sperm by the same individual. c. another term for copulation. d. the presence of observable differences between males and females.
In the United States it is currently legal for a company to patent genes.
Answer the following statement true (T) or false (F)