Biological membranes are held together mainly by ____
a. hydrogen bonds between lipid molecules
b. hydration layers over lipid molecules
c. exclusion of the nonpolar regions of lipids by water
d. hydrogen bonds between water molecules
e. surface tension at the interface between layers of water molecules
ANSWER: c
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In mitosis, the main difference between plant and animal cells is that
A. plants do not undergo cytokinesis. B. plants produce a cell plate to segregate the daughter nuclei, while animals form a cleavage furrow. C. plants have a central vacuole, while animal cells do not. D. plants produce a cell membrane in cytokinesis, while animals form a cell plate. E. in plants, kinetochore microtubules shorten and draw chromosomes toward the poles; in animals, polar microtubules lengthen to push chromatids apart.
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Molluscs that live in a tusk-like shell that is open at both ends belong to the class:
a. Polyplacophora. b. Scaphopoda. c. Cephalopoda. d. Gastropoda. e. Bivalvia.
Which is a unique adaptation in insects not found in any other arthropod?
a. wings b. cephalization c. segmentation d. hard exoskeletons e. specialized mouthparts