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

Biology & Microbiology

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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

Biology & Microbiology

Rarely, a chromosome’s structure becomes altered

when part of it undergoes __________, __________, __________, or __________. Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

What term describes distribution patterns of living things around the world?

What will be an ideal response?

Biology & Microbiology

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.

Biology & Microbiology