Which of the following is used by earthworms and some amphibians for respiration?
a. gills
b. pulmonary ventilation
c. skin
d. diffusion
c. skin
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Photosynthesis takes place in
a. flowers only. b. leaves only. c. roots only. d. any green part of the plant
Incidental catch refers to:
a. catch above a given quota. b. illegal fish catch. c. catch of noncommercial fish species. d. catch of endangered species. e. all the fish caught on a particular day.
A fat molecule has ____ fatty acids
a. 1 b. 2 c. 3 d. 4 e. 5
A population of T cells was stimulated to proliferate in response to a particular antigen. A sample of 1000 stimulated cells was analyzed by fluorescence-activated cell sorting (FACS) for total DNA content
Of the 1000 cells, 400 had a 2n amount of DNA, 200 had a 4n amount of DNA, and the remaining 400 cells had between a 2n and 4n amount of DNA. Additional immunofluorescence analysis revealed that 200 of the cells were in various stages of M phase and that M phase lasted 2 hours. What is the total length of the cell cycle? A) 8 hours B) 12 hours C) 18 hours D) 20 hours E) 24 hours