An essential amino acid or fatty acid is _____
a. needed in large amounts by the body
b. dispensable
c. not synthesized by the body
d. an essential component of digestive enzymes
e. required daily
ANSWER: c
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What affects the rate of diffusion through a selectively permeable membrane?
I. concentration gradient II. temperature III. molecular size
a. I only b. II only c. I and II d. II and III e. I, II, and III
A linear DNA fragment is cut with a restriction enzyme to yield two fragments. How many restriction sites are there for the enzyme in this fragment?
A. one B. two C. three D. four E. It cannot be determined with this information.
The shortest time required to kill all the microbes in a sample at a specified temperature is called the
A) Sporicidal time B) Death phase point C) Thermal death time (TDT) D) Thermal death point (TDP)
Cystic fibrosis affects the digestive system and the
a. liver. b. brain. c. kidneys. d. heart. e. lungs.