Which of the following exhibits the highest phagocytic activity?
A) eosinophils
B) erythrocytes
C) macrophages
D) basophils
E) neutrophils
C
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Which of the following statements best distinguishes scientific hypotheses from scientific theories?
A) Hypotheses describe and theories explain. B) Hypotheses explain and theories describe. C) Hypotheses are usually narrower in scope; theories have broader explanatory power. D) Hypotheses are used in experiments. Theories are not tested. E) Hypotheses are generally supported by more evidence than theories.
Which of the following is incorrectly paired?
a. mesoderm—muscle b. endoderm—skin c. ectoderm—feathers d. mesoderm—circulatory system
When an impulse passes from one neuron to the next, it
a. is passed directly from dendrite to axon. b. passes from axon to cell body to dendrite. c. can bypass the cell bodies of both axon and dendrite. d. passes from axon to dendrite. e. undergoes repolarization.
Hydrogen bonds can form between guanine and __________, and between adenine and __________
a. phosphate; sugar b. thymine; cytosine c. cytosine; thymine d. sugar; phosphate e. adenine; guanine