Which organisms do not have centrioles?
A. plants and fungi
B. plants and animals
C. animals and protists
D. fungi and protists
Answer: A
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Why don't ants that protect the Acacia tree scare off bees trying to pollinate the tree's flowers?
A. They can't climb to the tops of the tree. B. The bees are too big. C. The bees fly in and out quickly. D. The open flowers contain a chemical that is an ant deterrent. E. Parasitoid wasps protect the bees from attack.
Why are lipids and proteins free to move laterally in membranes?
A) The interior of the membrane is filled with liquid water. B) Lipids and proteins repulse each other in the membrane. C) Hydrophilic portions of the lipids are in the interior of the membrane. D) There are only weak hydrophobic interactions in the interior of the membrane.
Of the 23 pairs of human chromosomes, 22 pairs are homologous and are found in both males and females. These are called ________.
A. recombinant chromosomes B. somatic chromosomes C. autosomes D. bivalents
Cadherins and other cell-adhesion molecules that guide cell migration are
A) steroid hormones. B) glycoproteins. C) fatty acids. D) prostacyclins. E) ribonucleic acids.