Which of the following particles could diffuse easily through a cell membrane?
a. Oxygen
b. Sodium ion
c. Hydrogen ion
d. Glucose
Ans: a. Oxygen
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Fate maps have been produced for which of the following
a. humans only b. chickens only c. Xenopus only d. chickens, Xenopus, and Drosophila e. humans, chickens, Xenopus, and Drosophila
Rarely, a chromosome’s structure becomes altered
when part of it undergoes __________, __________, __________, or __________. Fill in the blank(s) with the appropriate word(s).
What term describes distribution patterns of living things around the world?
What will be an ideal response?
New World monkeys evolved approximately 30 million years ago. These animals are easy to identify because they
A. have flattened noses and prehensile tails. B. have prehensile tails and hair. C. have opposable thumbs and protruding noses. D. have opposable thumbs and binocular vision. E. have protruding noses and prehensile tails.