Gram-positive bacteria have ____ and appear ____ under the microscope after Gram staining.
A. thick cell walls; pink
B. thick cell walls; purple
C. thin cell walls; pink
D. thin cell walls; purple
E. thin cell walls; blue
Answer: B
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What is the function of the general transcription factor TFIID?
A. TFIID recognizes the enhancer. B. TFIID recognizes the TATA box. C. TFIID recognizes the silencer. D. TFIID transcribes mRNA. E. TFIID is a silencer.
Frameshift mutations may involve
a. substitution of nucleotides. b. substitution of codons. c. substitution of amino acids. d. addition or deletion of one or more base pairs. e. none of these
Figure 30.11
The plant movement in the accompanying figure is caused by ____.
A. auxin differences in two sides of the stems B. gibberellin released in one side of the leaf C. abscisic acid in two sides of the stems D. salicylic acid in two sides of the roots E. cytokinin differences in two sides of the stem
Cells with a relatively simple cell morphology that do not have a true membrane-delimited nucleus are called ________.
A. urkaryotes B. prokaryotes C. nokaryotes D. eukaryotes