Which of the following is nottrue of the regulation of the trp operon?
A. Transcription attenuation relies on the fact that bacteria lack a nucleus.
B. The level of tryptophan in the cell regulates the rate of transcription after transcription begins.
C. The level of tryptophan in the cell regulates the rate of transcription before transcription begins.
D. RNA polymerase is recruited to the promoter when tryptophan levels are high.
D
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The "9 + 2" pattern of the axoneme is nine ________ of microtubules and two additional microtubules in the center called the ________.
A) outer doublets; central pair B) basal bodies; inner two C) central tubules; double pair D) circular structures; middle two E) triplet groups; basal bodies
In which phase of mitosis do chromosomes arrive at opposite sides of the cell?
a. anaphase b. prophase c. metaphase d. telophase e. interphase
The Archaea and Bacteria are similar in that all
A. live in extreme environments. B. carry on photosynthesis. C. lack a nucleus. D. carry on aerobic respiration.
What roles do plasmids play in biotechnology?
A) Plasmids are used to break open the cell wall of bacterial cells. B) Plasmids are used to provide nutrients to bacterial cells. C) Plasmids are used to infect and destroy bacterial cells. D) Plasmids are used as a vector to transfer genes between organisms.