The selective advantage linked to the high frequency of the cystic fibrosis allele in Caucasians is:
a. an increased resistance to falciparum malaria.
b. the prevention of excessive water loss associated with certain types of diarrhea.
c. production of an enzyme to break down cholera toxin.
d. increased mucous secretions for the removal of infectious cells.
e. an increased probability of Salmonella infection.
B
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The extracellular matrix of a plant cell is composed of:
A. collagen. B. cadherin. C. cellulose. D. All of the above are correct.
An action potential is an abrupt and transient change in the membrane potential of an excitable cell
1.True 2.False
The assignment of names to taxonomic groups is referred to as ________.
A. identification B. systematics C. taxonomy D. nomenclature
______ are mostly stored in the liver and adipose tissue.
Fill in the blank(s) with the appropriate word(s).