The cell membrane is a highly selective barrier that controls the movement of substances in and out of the cell. in fact, polar molecules are unable to go across unless a. they are broken down into smaller pieces. b. they are enclosed in water-filled vesicles. c. they pass through channels in the cell membrane. d. they react with other substances to become nonpolar.
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Biology, 22.06.2019 05:00, shainaanderson24
Aristotle classified animals according to their a. habitat and mating behavior c. mating behavior and relatedness b. habitat and physical differences d. physical differences and mating behavior
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Biology, 22.06.2019 10:10, kdfawesome5582
Which example describes a mutualistic relationship between organisms? young wasps prey on caterpillars. crabs eat the remains of dead fish. tapeworms feed on food in the intestines of cats ants protect a tree on which they feed.
Answers: 2
The cell membrane is a highly selective barrier that controls the movement of substances in and out...
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