In the absence of a specific carrier protein, the molecule least likely to cross the membrane is one that is ________
a. small and nonpolar
b. small and polar
c. large and polar
d. large and nonpolar
c
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Which one of the following types of fatty acids would be likely to have the lowest melting temperature?
A. long tails and low saturation B. long tails and high saturation C. short tails and low saturation D. short tails and high saturation E. All fatty acids have the same melting temperature regardless of tail length or level of saturation.
Cells with ____ are able to harvest the greatest amount of energy from electrons
a. double membranes b. photosystems c. cytochromes d. chloroplasts e. nuclei
Which of these is true for most water-soluble
hormones? a. They must be transported by specific carriers in the blood. b. They have no trouble entering their target cells. c. They find and react with surface receptor molecules. d. They never elicit the production of a second messenger. e. They trigger gene transcription.
The pulmonary artery carries blood away from the
a. aorta. b. right atrium. c. right ventricle. d. left atrium. e. left ventricle.