Which of the following is a common function of membrane proteins? Select all correct choices
A. catalysis
B. attachment
C. transport
D. signal reception
Answer Key: A,B,C,D
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Avery, MacLeod, and McCarty (1944) demonstrated that DNA was the molecule of heredity by treating heat-killed Streptococcus pneumoniae S (smooth) strain with DNase, thereby preventing transfer of the "transforming substance" from the killed S strain to the live R (rough) strain when the two were mixed together and injected into mice. Another way that one could demonstrate transformation in
bacteria would be to extract DNA from A) an R strain and mix with cells of an S strain. B) both S and R strains and mix to allow recombination to take place. C) an ampicillin-sensitive strain and mix with cells of an ampicillin-resistant strain. D) an S strain and mix with cells of an R strain. E) none of the above
Today, evolutionary biologists view speciation as a ____, and instead study the ____ of speciation using classical and genomic approaches.
a. single event; products b. process; products c. product; process d. product; events e. single event; process
Which of these is NOT a characteristic of sponges?
a) Amoebocyte cells transport food and make skeletal fibers and gametes. b) Flagellated choanocytes move water. c) Water enters through a single cavity, the osculum. d) sessile filter feeders e) body wall has two cell layers
Which of the following best explains why bees aren't attracted to red flowers?
A. Red flowers are imperfect and do not produce pollen. B. Bees perceive red as a warning signal. C. Bees can't see red. D. Red flowers usually are odorless. E. Red flowers do not produce nectar.