If each nucleotide coded for a single amino acid, how
many different types of amino acids could be
combined to form proteins?
a. 4
b. 16
c. 20
d. 64
e. none of these
Answer: a
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A ___ is a chemical that is released by one animal that affects the physiology and or behavior of another member of the same species.
A) neurotransmitter B) neurochemical C) hormone D) pheromone
Which radical idea did Cuvier propose based on his studies of Earth’s history?
a. extinction of species b. evolution of species c. Earth as billions of years old d. an unchanging Earth e. static species composition
The Pacinian corpuscle is used in detecting
a. sound. b. pressure. c. chemicals. d. sight. e. chemical differences
Of these steps, which one occurs earliest in the process of producing recombinant DNA?
A) Human DNA fragments are mixed with the cut plasmids. B) The same restriction enzyme is used to isolate the gene of interest and to cut the plasmid DNA. C) The recombinant plasmids are mixed with bacteria. D) Bacteria carrying recombinant plasmids are cloned.