The first evidence for nucleosome formation came from digesting chromosomal DNA with a nonspecific nuclease. Gel electrophoresis of the DNA after the reaction revealed:
A. a ladder of protected fragments about 1,000 bp apart.
B. a ladder of protected fragments about 200 bp apart.
C. a large band corresponding to 200 bp.
D. random distribution of bands corresponding to different sizes.
E. four bands, each composed of a different histone.
B
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Where can inactive G-proteins be found?
a. bound to phosphodiesterase b. bound to adenylyl cyclase c. bound to guanosine triphosphate d. bound to cyclic AMP
Explain how the graphed data of beak size and weather conditions is evidence for natural selection. 
What will be an ideal response?
During hypoglycemia, all of the following would occur except:a
calcitonin would be released. b. more parathyroid hormone would be released. c. the rate of calcium reabsorption from the kidney tubules would increase. d. the rate of calcium release from bones would increase. e. muscle spasms.
Destroyed tissue throughout the lungs and the presence of acid-fast bacteria in a sputum sample likely indicate infection by
a. Bordetella pertussis. b. Corynebacterium diphtheriae. c. Mycobacterium tuberculosis. d. Streptococcus pneumoniae.