Whereas the sense of taste is based on ________ (how many?) classes of taste receptors, the sense of smell has over ________ (how many?) different receptors for chemicals associated with odor
A) 5; 1,000
B) 20; 200
C) 150; 6
D) 10; 10,000
E) 500; 5,000
A
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In the Hershey and Chase experiment, phage-infected bacteria and viral progeny were radioactive following bacterial
infection with 32P-labeled viruses. Why?
a. Bacteria had incorporated radioactive proteins into their DNA. b. Bacteria and viral progeny had incorporated 32P into their DNA. c. Viral progeny had used the 32P to build new viral proteins. d. Bacteria had incorporated radioactive proteins into their cell membranes. e. 32P was left outside the cell during viral infection.
Dinoflagellates
a. may produce bioluminescent tides that poison and kill fish. b. are parasites of fish and invertebrates. c. may undergo a population explosion that colors the ocean. d. are aquatic producers in freshwater or marine habitats. e. have all of these characteristics
Cartilaginous fishes retain __________ in their body, so they do not lose or gain water by osmosis. Fill in the blank(s) with the appropriate word(s)
Which of the following would be true for DNA molecule?
A. A+C+G= T B. A+C=G+T C. A= C+T D. A=T and C=G E. A+T = C + G