In gram-positive Bacteria, the cell walls are composed mainly of thick ________ layers
A) protein
B) poly-?-hydroxybutryic acid (PHB)
C) lipopolysaccharides (LPS)
D) peptidoglycan
Answer: D
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How did Bayliss and Starling demonstrate that the small intestine secretes chemical signals that stimulate the pancreas to respond to acid?
B. They exposed a dog's small intestine to a cell extract made from a second dog's small intestine that had been exposed to acid. C. They cut out a piece of the small intestine and exposed it to acid. D. They injected pancreatic secretions from a dog previously exposed to acid into the small intestine of a second dog. E. They injected acid into the pancreas after removing all of its innervation.
Your alarm clock goes off once again, and it is 7 a.m. Which of the following events leads you to hit
the snooze button?
a. The number of alpha waves emitted by the brain increases. b. The number of theta waves emitted by the brain increases. c. The reticular formation sends stimuli to the cerebral cortex. d. The cortex of the cerebellum is stimulated. e. The limbic system is stimulated.
Crossing over
A) is followed immediately by separation of each of the chromatids. B) prevents genetic recombination. C) results in only one exchange per homologue. D) increases variability in gametes. E) occurs between sister chromatids.
When sperm enter the epididymis, they ________
A) come from the vas deferens B) are mature C) are ready to fertilize an egg D) are incapable of moving on their own