How does the large amount of genetic variation observed in prokaryotes arise?
A.) The mutation rate in prokaryotes is much higher than in eukaryotes.
B.) They have extremely short generation times and large populations.
C.) They can exchange DNA with many types of prokaryotes by way of horizontal gene transfer.
D.) They have a relatively small genome.
E.) The second and third answers are correct.
Answer:
B.) They have extremely short generation times and large populations.
C.) They can exchange DNA with many types of prokaryotes by way of horizontal gene transfer.
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Which statement best describes the gametes of most animals?
a. A sperm is large and motile; an egg is small and nonmotile. b. A sperm is small and nonmotile; an egg is large and motile. c. A sperm is large and nonmotile; an egg is small and motile. d. A sperm is small and motile; an egg is large and nonmotile. e. The sperm and egg are about the same size, but only the sperm is motile.
Which of the following connects bones to muscles?
a) ligaments b) tendons c) synovium d) suture
Atoms that share electrons have what type of bonds?
A. colloidal B. ionic C. covalent D. hydrogen E. neutral
All of the following are phenols or phenolics, except
A. hexachlorophene. B. triclosan. C. chloramines. D. lysol. E. cresols.