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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology