Which of the following is not part of the upper respiratory tract?
A. Trachea
B. Mouth
C. Pharynx
D. Nasal cavity
E. Larynx
Answer: A
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Epithelial cells are more likely to become cancerous than other tissue cells because epithelial cells ____
a. lack a nucleus b. are always exposed to the external environment c. are only found in simple tissues d. undergo DNA replication more often e. have an extensive blood vascular system
A cotyledon is?
A. a fragment of tissue used for reproduction in bryophytes. B. the fruit produced by flowers of angiosperms. C. the first leaf structure to arise in the embryo of an angiosperm. D. a spore-like structure used for reproduction in plants. F. the zygote formed in ferns from the union of two gametes
Ribose differs from deoxyribose by having:a
two attached bases. b. one less oxygen. c. an extra hydroxyl group. d. an extra carbon in the ring. e. one less carbon in the ring.
Nucleic acids are polymers of ________ monomers
A) monosaccharide B) fatty acid C) DNA D) nucleotide