The United States gets ________ of its commercial energy from nonrenewable sources.
A. none
B. most
C. almost all
D. all
C. almost all
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How does the sodium channel selectivity filter differentiate Na+ and K+ ions? Choose the correct option
A) K+ ions have the wrong charge. B) The K+ ions are stripped of all their water molecules but the Na+ ions are not. C) Sodium channel admits a Na+ water complex with the water serving as a molecular chaperone through the channel. D) K+ is excluded by voltage gating.
Which of the following bones is NOT part of the appendicular skeleton?
A) femur B) humerus C) clavicle D) sternum
In contrast to immunoglobulins, ?:? T-cell receptors recognize epitopes present on _______ antigens:
a. carbohydrate b. lipid c. protein d. carbohydrate and lipid e. carbohydrate, lipid, and protein.
Americans of college age (19 to 29) typically
A) get more sleep than the average American adult. B) get less sleep than the average American adult. C) get an equitable amount of sleep compared to the average American adult. D) None of the answers is correct. There are no generalizations for this age group regarding sleep patterns.