Which pancreatic secretion works in conjunction with bile?
a. protein digesting enzymes
b. secretin
c. carbohydrate digesting enzymes
d. fat digesting enzymes
e. bicarbonate
ANSWER: d
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The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. Which of the following is the most likely explanation for these data?
A. Natural selection in an aquatic environment resulted in significant changes to whale forelimb anatomy. B. Forelimb evolution was adaptive in people and bats, but not in whales. C. Genes mutate faster in whales than in humans or bats. D. Whales are not properly classified as mammals. E. Humans and bats evolved by natural selection, and whales evolved by Lamarckian mechanisms.
In cells that are constantly involved in secretion, an equivalent amount of membrane must be returned
to the interior of the cell for each vesicle that fuses with the plasma membrane; if this does not occur, then what would happen? a. The ratio of cell surface would decrease, compared to cell volume. b. The cell surface would shrivel. c. The surface area would remain constant. d. The number of membrane receptor proteins would decrease. e. The cell surface will keep expand
Which is the correct pathway of a protein through a cell as it is being made?
A) Nucleus, ribosome, Golgi apparatus B) Golgi apparatus, ribosome, rough endoplasmic reticulum C) Nucleus, smooth endoplasmic reticulum, Golgi apparatus D) Golgi apparatus, ribosome, mitochondria