What condition develops when GABA levels in the brain are deficient?
A. epilepsy
B. insomnia
C. Huntington's disease
D. Alzheimer's disease
E. Parkinson's disease
C. Huntington's disease
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Most of the aquatic macroinvertebrates in a stream are
(a) clams. (b) insect larvae. (c) worms. (d) arthropods such as crayfish.
The accessory glands of the male are the:a
seminal vesicles only. b. prostate gland only. c. bulbourethral glands only. d. seminal vesicles and prostate gland. e. seminal vesicles, prostate gland, and bulbourethral glands.
Phosphofructokinase is an important control enzyme in the regulation of cellular respiration. Which of the following statements concerning phosphofructokinase is not true?
A) It is activated by AMP (derived from ADP). B) It is inhibited by ATP. C) It is activated by citrate, an intermediate of the citric acid cycle. D) It specifically catalyzes the conversion of fructose-6-phosphate to fructose-1,6-bisphosphate, an early step of glycolysis. E) It is an allosteric enzyme.
Why is visualization not sufficient to properly identify bacteria?
a. Identification is only needed in clinical specimens. b. Not all bacteria can be seen with a light microscope. c. Many unrelated bacteria can share the same shape. d. Bacteria have a limited set of shapes. e. Bacteria have a limited set of shapes and many unrelated bacteria share the same shape.