Animals that obtain most of their heat from the environment are (select all correct choices):
A. ectotherms.
B. cold-blooded.
C. more likely to use behavioral means to
regulate body temperature than physiological
means.
D. unable to maintain a constant core body
temperature.
E. most active in the night in order to
generate as much heat as possible.
A,B,C,D
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Cells sometimes use methylation: (Select all correct choices)
A. to prevent the expression of genes in transposable elements. B. to prevent the expression of genes from viruses that have been integrated into the genome. C. to prevent the expression of harmful (mutant) genes such as those responsible for cystic fibrosis.
_____ is the original source of new alleles
a. Mutation b. Natural selection c. Genetic drift d. Gene flow e. All are original sources of new alleles
Proteasomes direct the destruction of defective DNA
__________________ Indicate whether the statement is true or false.
Physical deterrents on plants discourage the interspecific interaction called ________.
Fill in the blank(s) with the appropriate word(s).