The peptidoglycan of bacterial cell walls contains a carbohydrate matrix linked together by short chains of
A. amino acids.
B. nucleotides.
C. fatty acids.
D. steroids.
E. water molecules.
Answer: A
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The movement of water through a membrane, from an area of high concentration to an area of low concentration, is known as
A) active transport. B) facilitated transport. C) passive transport. D) osmosis. E) photolysis.
One hallmark of speciation is ____
a. lack of change in reproductive behaviors b. a decrease in balanced polymorphisms c. an increase in fixed alleles d. decreased genetic diversity of populations
e. end of gene flow between populationsDefense mechanisms that function to protect the body against many infectious agents are called
a) adaptive b) innate c) barriers to entry d) immunity
The sympathetic nervous system is part of the
A. limbic system in the brain mediating emotion. B. somatic nervous system. C. central nervous system. D. learning and memory system. E. autonomic nervous system.