Engelmann’s investigation to determine the effective
wavelengths of light in photosynthesis depended on a
photosynthetic alga’s
a. use of CO2.
b. release of O2.
c. use of H2O.
d. use of ATP.
e. production of carbohydrate.
Answer: b
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How does gene flow affect the genetic composition in populations?
A. Gene flow promotes genetic diversity by introducing new alleles into populations. B. Gene flow tends to make the allele frequencies in neighboring populations more similar to each other. C. Gene flow promotes genetic diversity by introducing new alleles into populations and gene flow tends to make the allele frequencies in neighboring populations more similar to each other. D. Gene flow promotes genetic similarities by removing alleles from a population.
A nonprotein component of an enzyme that is usually a metal ion or small organic molecule is called a(n) ________.
Fill in the blank(s) with the appropriate word(s).
The operation of a synapse
a. results from the passage of an electrical charge across the gap. b. involves a transmitter substance from vesicles in the presynaptic neuron that act upon receptor sites on the postsynaptic neuron. c. occurs only between two nerves. d. is limited only by the action of acetylcholinesterase. e. involves transduction of the electrochemical energy of an action potential into mechanical energy of movement.
Genetic coding for virulence factors can be transferred among various bacteria by:
A. single-stranded DNA. B. plasmids. C. double-stranded RNA. D. chromosomal DNA