The feature that most clearly separates eukaryotes from prokaryotes is the presence in eukaryotic cells of
a. ribosomes.
b. oxidative phosphorylation.
c. DNA molecules.
d. a nucleus.
Ans: d. a nucleus.
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At the current rate of description, how long will it take to compile a complete catalog of life on Earth?
a. 5 years b. 50 years c. 500 years d. 5000 years
The change in frequency of traits in a population is known as _____________
Fill in the blank(s) with the appropriate word(s).
The proteins necessary for the use of lactose in E. coli are collectively called the
A. lac suppressor. B. lac transcriptional operator. C. lac promoter. D. lac regulator. E. lac operon.
Manta rays, sting rays, and eagle rays are similar to lampreys in that they have cartilaginous skeletons. How are they different from lampreys?
A. They have closed circulatory systems. B. They have jaws. C. They have gills. D. They have bony fin lobes.