David Pribnow studied the base sequences of promoters in bacteria and bacterial viruses. He found two conserved regions in these promoters (the -10 box and the -35 box). These two regions of the promoter _____
A) signal the initiation site
B) bind the sigma subunit that is associated with RNA polymerase
C) attach the correct nucleotide triphosphate to the template DNA strand
D) separate the two DNA strands
Answer: B
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Each cell is able to maintain an internal environment within a range that favors survival. This condition is called
a. metabolism. b. homeostasis. c. physiology. d. adaptation. e. evolution.
A student is designing an experiment to show the effects of the movement of water across a selectively permeable membrane. He places a highly concentrated saltwater solution into a bag that is permeable only to water
He then submerges the bag into a beaker of pure water. Which one of the following can be expected? A) The net flow of water will be from the bag to the surrounding water. B) The pH of the contents of the bag will increase over time. C) The volume of the bag will decrease over time. D) The net flow of water will be from the beaker into the bag, causing the contents of the bag to increase in volume. E) In this situation, the flow of water into the bag will never equal the flow of water out of the bag.
Which of the following choices lists the organs of the human alimentary canal in the CORRECT order?
A) pharynx, oral cavity, esophagus, stomach, large intestine B) oral cavity, pharynx, esophagus, stomach, small intestine, large intestine C) esophagus, pharynx, stomach, large intestine, small intestine D) oral cavity, esophagus, stomach, large intestine, small intestine
In the runaway selection simulation, what is not necessary for a trait like turning bias to evolve by sexual selection?
A. variation in turning bias B. preference for size C. at least 2 individuals to compare D. preference for turning bias