Which of the following animals would have access to the most oxygen in its environment?
a. a termite living in its underground nest
b. a snow leopard living high in the Himalayan mountains
c. a zebra living close to sea level
d. a deep-sea ray
C
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The occurrence of multiple alleles at a specific locus is called
A) signal transduction. B) the variable domain. C) polymorphism. D) allelic exclusion.
Which neurotransmitter is released from a motor neuron at the neuromuscular junction?
A. acetylcholine B. GABA C. ephinephrine D. dopamine E. serotonin
Radiometric dating of the most ancient fossils uses the
a. dating volcanic rocks above and below the fossil-containing layer of sedimentary rock. b. ratio of carbon 14 to carbon 12 in a sample of the fossil. c. counting of the rings of trees found with the fossils. d. comparison of unknown fossils with fossils of known age. e. transmission of radio waves through the fossil.
In their famous experiment, which of the following would Meselson and Stahl have observed after one cycle of replication in 14N medium if DNA replication was conservative?
A) DNA molecules containing one strand of 15N-DNA and one strand of 14N-DNA B) DNA molecules containing two 15N-DNA strands only C) DNA molecules containing two 14N-DNA strands only D) An equal number of DNA molecules containing two 15N-DNA strands and DNA molecules containing two 14N-DNA strands. E) A mix of DNA molecules corresponding to A and B.