The large intestine concentrates undigested material by
A. ingestion of excess salts and water by intestinal bacteria.
B. absorption of salts and water across the epithelial surface of the lumen.
C. storing excess salts and water in the cecum.
D. transporting excess salts and water back to the small intestine for absorption.
Answer: B
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One disadvantage of hydroelectric energy as a renewable power source is that ____
a. it causes disease-causing organisms to remain in the stream b. it contributes to acid rain c. it produces greenhouse gases d. its dams block salmon from returning to streams to breed e. it pollutes streams downriver from the dams
Within the transcription bubble, the 9 most recently added nucleotides in the newly synthesized RNA strand temporarily form a helix with the template DNA strand. How might transcription be affected if helix formation did not occur?
A. Rewinding the DNA molecule would be inhibited. B. Unwinding the DNA molecule would be inhibited. C. The position of the 5' end of the RNA would be unstable, inhibiting elongation. D. The position of the 5' end of the RNA would be unstable, stimulating elongation. E. The position of the 3' end of the RNA would be unstable, inhibiting elongation.
Which of the following is the reason why the sub-Saharan population projections for the year 2025 have been scaled back from 1.33 billion to 1.05 billion people?
A. famine B. drought C. AIDS D. tuberculosis E. malaria
The key specializations that occurred in the evolution of mammals include all of the following except
A. reduction in brain size. B. warm-bloodedness. C. digestive tract specialization. D. the presence of a placenta in most. E. different teeth suited to their diet.