To turn genes off, a regulatory protein called a(n) ________ is bound to a regulatory site so that RNA polymerase is blocked.
A. translator
B. operon
C. signal molecule
D. repressor
Answer: D
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Who demonstrated the crossover of homologous chromosomes in experiments on corn plants?
a. Frans Janssen and Curt Stern b. Thomas Hunt Morgan and Alfred Sturtevant c. Harriet Creighton and Barbara McClintock d. Walter Sutton and Theodor Boveri
A(n) ________ is a group of three bases on tRNA that is complementary to a specific mRNA codon.
A. poly-A tail B. anticodon C. codon D. cap
When a triplet of bases in the coding sequence of DNA is "GCA," the corresponding codon for the mRNA that is transcribed from it is:
a. CGU. b. CGT. c. GCA. d. TGC. e. UGC.
Which of the following would be a characteristic of a K-selected species?
A) Individuals tend to die at all ages in the life span. B) Most die at relatively young ages. C) All K-selected species live very long life spans. D) Most K-selected species live until older age.