Which of the following may lead to cancer?
A. Tumor supressor genes
B. Oncogenes
C. Viruses
D. Mutation
E. All of the above, except (A), may lead to cancer
Answer: E. All of the above, except (A), may lead to cancer
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Which category of media can be described as containing one or more agents that are inhibitory to all organisms except those being sought?
a. Enrichment b. Supportive c. Selective d. Differential
Excess glucose in most complex plants is stored as
a. fructose. b. starch. c. sucrose. d. glycogen. e. cellulose.
A bundle of muscle cells is called a(n) ________
Fill in the blank(s) with correct word
What evidence supports the idea that some nuclei are totipotent?
a. Nuclei taken from the cells of an embryonic frog can direct a frog egg to develop into a tadpole. b. Nuclei taken from the cells of a frog embryo can direct any amphibian egg to develop into a tadpole. c. Nuclei taken from a different species can direct a tadpole egg to develop into a normal tadpole. d. Some cells are capable of undergoing unlimited cell cycles.
e. Some cells are capable of arresting their cell cycle at will.