In the lac operon, the protein that binds to the operator to prevent transcription is
A. the repressor.
B. RNA polymerase.
C. DNA polymerase.
D. the promoter.
E. lactose.
A. the repressor
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In order to test a hypothesis, a scientist would measure which of the following during an experiment?
a. the independent variable b. the dependent variable c. the standard variable d. the constant
Which of the following statements describes the function of a chloroplast?
a. It stores water. b. It aids in intracellular digestion. c. It converts light energy into chemical energy. d. It manufactures proteins. e. It converts chemical energy into heat energy.
A defining characteristic of eukaryotic organisms is that they
A. use the leucine zipper primarily for the production of the amino acid tryptophan. B. carry out protein synthesis only in the presence of the cAMP molecule. C. have only operons to assist in gene expression. D. have their transcription occurring in the nucleus and translation in the cytoplasm. E. have their transcription occurring in the cytoplasm and translation in the nucleus.
Asexual reproduction in ascomycetes takes place by means of
A. ascogonia. B. zygospores. C. motile gametes. D. conidia. E. ascospores.