Tetanus prevents the release of neurotransmitters from
A. muscle cells.
B. excitatory neurons.
C. inhibitory neurons.
D. tetano cells.
C
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The rate at which evolution is occurring cannot be estimated by:
A. studying comparative anatomy. B. inferring that apes are related to humans. C. measuring the degree of difference in genetic coding. D. interpretation of the fossil record.
Secondary succession can occur ____
a. after a fire b. on a new sand dune c. on bare rock d. immediately after the formation of an artificial lake e. on a glacier
What is characteristic of adult frogs?
a. gills b. sucking air into their lungs c. countercurrent exchange d. pushing air into their lungs e. drawing water by inhalation across their gills
At the beginning of this century there was a general announcement regarding the sequencing of the human genome and the genomes of many other multicellular eukaryotes
Many people were surprised that the number of protein-coding sequences was much smaller than they had expected. Which of the following could account for much of the DNA that is not coding for proteins? A) DNA that consists of histone coding sequences B) DNA that is translated directly without being transcribed C) non-protein-coding DNA that is transcribed into several kinds of small RNAs with biological function D) non-protein-coding DNA that serves as binding sites for reverse transcriptase