Four of the five answers listed below are
people who were involved in the discovery of
the structure of DNA. Select the EXCEPTION.
a. Wilkins
b. Wallace
c. Watson
d. Franklin
e. Crick
B
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During muscular contraction, cross-bridges form between _____ and _____ .
A. actin, myosin B. actin, tropomyosin C. myosin, troponin D. myosin, tropomyosin E. troponin, calmodulin
In what way do birds differ from mammals?
a. They lack clavicles and pectoral muscles. b. They have 12 pairs of cranial nerves. c. They have unidirectional airflow through the lungs. d. They have a closed circulatory system.
When does the phosphodiesterase that is required to deactivate cAMP exist in the cell?
a. It is synthesized in response to increasing cAMP concentrations. b. It is actively absorbed from the intercellular medium by the cell. c. Phosphodiesterase is always present in the cell. d. Phosphodiesterase is a byproduct of cAMP hydrolysis.
The X and Y chromosomes ____
a. are responsible for autosomal recessive inheritance b. will lead to color-blindness in all carriers c. are found paired with all 22 autosomal chromosomes d. are responsible for albinism e. play major roles in determining the sex of an individual