Which of the following is not an accurate statement describing the contributions of researchers to the structure of DNA?
A. Erwin Chargaff determined that the percent of adenine was equal to the percent of thymine and the percent of guanine was equal to the percent of cytosine.
B. Watson and Crick used the work of previous researchers, including Chargaff and Franklin to determine the overall structure of DNA with sugar and phosphate components making up the strands with the nitrogenous bases in the interior.
C. Rosalind Franklin used X-ray crystallography to determine that DNA was a double helix in shape.
D. Alfred Hershey and Martha Chase injected viruses into mice to determine that the inheritable material was DNA and not protein.
Answer: D
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What event occurs first in the process of hemostasis?
a. Platelets stick together. b. Platelets form a plug. c. An enzyme cascade activates thrombin. d. The injured vessel constricts. e. Fibrin forms a clot.
Compared with a shade-intolerant plant, a shade-tolerant plant
A) has a greater SLA. B) grows faster. C) requires a higher intake of CO2 to balance losses of CO2 from respiration. D) allocates very little carbon to leaf tissue.
Which word is defined by this statement: A measure of this disorder, or randomness?
a. energy b. entropy c. enthalpy d. mass e. catabolism
Figure 33.17
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Use the accompanying figure to answer the following question.
The structure that protects the eyeball is indicated by the letter ____.
A. A B. B C. C D. D E. E