Phenylalanine is a(n) ____ and the starting point for a network of metabolic pathways
a. lactase precursor molecules
b. carbohydrate by-products of respiration
c. essential amino acid
d. sub-types of hemoglobin
e. phenylthiocarbamides
ANSWER: c
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Gene probes can be labeled for detection with reporter molecules such as ________.
A. radioisotopes B. fluorescent dyes C. enzymes D. All of the choices above can be used.
The controls of the cell cycle are like
a. the brakes of a bicycle. b. the pedals of a bicycle. c. the handles bars of a bicycle. d. the seat of a bicycle. e. more than one of these.
In nutrient-rich water, photosynthetic protists may undergo population explosions known as
__________. Fill in the blank(s) with the appropriate word(s).
Model organisms used by cell and molecular biologists include all of the following EXCEPT:
A) bacteria B) orangutans C) mice D) nematodes