How did Bayliss and Starling demonstrate that the small intestine secretes chemical signals that stimulate the pancreas to respond to acid?
A. They injected acid into a dog's small intestine after dissecting away all the nerves.
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.
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.
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The stroma is located in the mitochondrion and is the place where the light reactions of photosynthesis take place.
a. true b. false
Which of the following statements is true regarding the involvement of sexual selection on male function (pollen donation) leading to sexual dimorphism in flowers?
A) Female flowers typically receive far more pollen than is needed to fertilize their seeds. B) Delph and colleagues (1996 ) found that out of 42 animal-pollinated plant species, 29% of females had the largest reproductive parts, but males had the largest perianths. C) Studying wild radishes, Stanton and colleagues (1996 ) found that reproductive success through pollen donation was limited by pollinator visits, whereas reproductive success through seed production was not. D) All of the above statements are true.
A covalent bond involves the sharing of
a. electrons. b. protons. c. pairs of protons. d. at least three electrons. e. pairs of electrons.
Which of the following items that are commonly added during food preparation can be considered a preservative?
A) apple juice B) meat broth C) garlic D) yeast E) whey