Damaged DNA is usually repaired by
a. enzymes
b. purines
c. ribosomes
d. nucleotides
Ans: a. enzymes
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Which one of the following amino acids is capable of forming a disulfide linkage?
A. tyrosine B. cysteine C. arginine D. methionine E. isoleucine
Fish that mimic the morphology and behavior of cleaner wrasses are:
a. groupers. b. pipefishes. c. stonefish. d. blennies. e. butterfly fish.
Child birth is regulated by a _____ feedback mechanism.
Fill in the blank(s) with the appropriate word(s)
Echinoderms are classified as Bilateria, but although they start out as bilateral larvae, they change into radially symmetrical adults. You might hypothesize that their genes controlling the development of radial symmetry are
A. similar to a common set of genes controlling body form in Ctenophora and Lophotrochozoa. B. similar to genes controlling body form in Ctenophora. C. different from those controlling development of symmetry in all other radially symmetrical animals. D. similar to genes controlling body form in Lophotrochozoa. E. similar to genes controlling body form in Porifera.