Pathogenic strains of Escherichia coli usually express
A) capsules.
B) colonization factor antigens (CFA).
C) plaques.
D) slime layers.
Answer: B
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Alpha helices are coils with how many amino acids per complete turn?
A. 2.5 B. 3.6 C. 4.8 D. 10 E. 20
The movement of water through a membrane, from an area of high concentration to an area of low concentration, is known as
A) active transport. B) facilitated transport. C) passive transport. D) osmosis. E) photolysis.
If the ciliary muscle of the eye is damaged, then
a. color vision will be lost. b. the amount of light entering the eye cannot be regulated. c. proper focusing will be impossible. d. only peripheral vision is available. e. "night blindness" will become more evident.
If red flowers (R) is dominant over white flowers (r), plants with rr ____
a. are heterozygous b. are homozygous recessive c. have red flowers d. have white flowers e. have pink flowers