Which of the following is the cancer of epithelial cells?
A. sarcoma
B. lymphoma
C. leukemia
D. carcinoma
E. myoloma
D. carcinoma
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Liverworts and mosses utilize which of the following pigments for photosynthesis?
(a) chlorophylls a and b. (b) carotenes. (c) xanthophylls. (d) all of the above.
Which mechanism of genetic transfer utilizes a sex pilus?
A. Transformation B. Transduction C. Conjugation D. All of the answers are correct
Formation of a tetraploid plant species from two different diploid parental species of plants is an example of
A. punctuated equilibrium. B. gradualism. C. extinction. D. a postzygotic barrier to evolution. E. a prezygotic barrier to evolution.
The main function of the AV node is to
A) initiate the heartbeat. B) set the rhythm of the heartbeat. C) relay the signal for the heart to contract from the right ventricle to the right atrium. D) relay a signal for the ventricles to contract.