The failure of which organ affected by a defective CFTR protein is likely to cause death in cystic fibrosis patients?
a. lungs
b. intestines
c. heart
d. liver
e. reproductive system
ANSWER: a
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The action of a nerve impulse, neurotransmitter release at the neuromuscular junction, calcium release from the sarcoplasmic reticulum, and subsequent muscle contraction is known as:
A. an action potential B. threshold potential C. a motor event D. excitation-contraction coupling
In standardized DNA fingerprinting used in the United States, ____
a. 13 different noncoding loci are examined b. 13 different coding loci are examined c. only loci that do not vary among individuals are examined d. only long tandem repeats loci are examined e. the sequence of short tandem repeats is determined
The toxic superoxide ion is converted to harmless oxygen by two enzymes,
A. catalase and hydrogen peroxidase. B. superoxide dismutase and catalase. C. superoxide dismutase and hydrogen peroxidase. D. catalase and oxidase. E. superoxide dismutase and oxidase.
Organs are composed of tissues, which are composed of cells. This is an example of which characteristic of life?
A. Living things grow and develop B. Living things respond to stimuli C. Living things maintain themselves by homeostasis. D. Living things have levels of hierarchical organization. E. Living things are adapted to the environment.