Which is the simplest of all levels of organization?
A. atom
B. cell
C. organ
D. organism
E. population
A. atom
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Tetanus prevents the release of neurotransmitters from
A. muscle cells. B. excitatory neurons. C. inhibitory neurons. D. tetano cells.
Which reagent is used to test for the presence of starch?
a. I2KI b. Nile blue c. Ninhydrin d. Biuret
An allele is
a. the dominant form of a gene. b. an alternate form of a gene. c. always recessive. d. the main factor determining a trait. e. always one of a pair.
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.