Which of the following is true of the mechanism of transcription attenuation of the trp operon?
A. The leader peptide mechanism is analogous to a repressor protein.
B. The ribosome stalls at the adjacent Trp codons when the levels of tryptophan in the cell are high.
C. The stalling of the ribosome at region 1 of the leader sequence inhibits the formation of the terminator structure.
D. When sequences 2 and 3 of the leader sequence associate, transcription is terminated prematurely.
C
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Which of the following is the correct order of steps of gas transport and exchange?
A. ventilation, diffusion across the respiratory surface, circulation, diffusion between blood and cells B. diffusion across the respiratory surface, ventilation, diffusion between blood and cells, circulation C. ventilation, circulation, diffusion across the respiratory surface, diffusion between blood and cells D. circulation, diffusion across the respiratory surface, ventilation, diffusion between blood and cells E. diffusion between blood and cells, circulation, ventilation, diffusion across the respiratory surface
The advantage to a species of using a pheromone for communication rather than calling or gesturing is that it _____
a. conveys more information b. is more easily understood c. is more energy efficient d. is more variable e. conveys immediate information
In one butterfly species, the colors of individuals range from white to black, with many shades of gray in between
If the butterflies in a mountain population become more and more similar in color over several generations (e.g., if most butterflies are the same shade of gray), what kind of evolutionary force is likely acting on the population? A) Artificial selection B) Stabilizing selection C) Directional selection D) Disruptive selection
Which nervous system is associated with rest and arousal?
-the Central Nervous System -the Autonomic Nervous System -the Somatic Nervous System -the Automatic Nervous System