This animal has radial symmetry, a
gastrovascular cavity, and the same opening is
for the entry of food and expulsion of waste. It
is ___.
a. a cnidarian
b. a flatworm
c. an annelid
d. a mollusk
e. more than one of these
A
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Which base is not found in DNA?
A. Cytosine B. Guanine C. Thymidine D. Adenine E. Uracil
In human populations, Hardy-Weinberg equilibrium is seen
A) in small, isolated communities. B) in populations with many immigrants. C) in communities founded by a small number of people. D) infrequently and in large communities with random mating.
What may be a result of the denaturation of proteins?
a. formation of hydrogen bonds b. loss of three-dimensional structure c. removal of R groups from amino acids d. no change in enzyme activity e. formation of covalent bonds
Memory cells "remember" the antigen and make a faster and greater response the next time the antigen is encountered.
a. true b. false