The two erythrocyte proteins, glycophorin and band 3, are examples of
a. peripheral proteins.
b. transmembrane proteins.
c. cytoskeletal proteins.
d. ?-barrel proteins.
Ans: b. transmembrane proteins.
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There was a mass extinction of plants and animals at the end of the Permian period. Which of the following would be a reasonable prediction for the fungal fossil record?
A. There should be a massive increase in saprophytic fossils during the extinction, and then a massive decline shortly after the extinction was complete. B. There should be a slow increase in all fungal fossils during the time that plant and animal species declined, with their numbers staying relatively high afterward since there was little competition from other species. C. There should be a massive decrease in all fungal fossilsat the same time that plant and animal species started to decline, and the number of these fossils should remain low throughout the extinction period D. There should be a massive increase in mycorrhizal fossils during the extinction and afterward.
Microtubules are typically _______ in diameter.
a. 7 nm b. 10-12 nm c. 25 nm d. 35 nm e. 55 nm
Tobacco mosaic virus can be transmitted between individual plants by biting insects.
Answer the following statement true (T) or false (F)
The most commonly used practical form of energy used in cells is adenosine diphosphate.
Answer the following statement true (T) or false (F)