When multiple genes contribute to the expression of a phenotype they are called ________

A) concordant alleles
B) nonadditive alleles
C) heterozygous alleles
D) additive alleles
E) homozygous alleles


Answer: D

Biology & Microbiology

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When sugar dissolves in water, water is acting as a ____ and the sugar molecules are acting as ____

a. solution; solvents b. solute; solutions c. solvent; solutes d. solute; solvents e. solvent; solutions

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What level(s) of protein structure could be affected by a nucleotide substitution that results in an amino acid change in a polypeptide? (Select all that apply.)

A) primary structure B) secondary structure C) tertiary structure D) quaternary structure E) There will be no structural changes.

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Muscles exert force by

a. expanding in one direction. b. expanding in either of two directions. c. pushing in one direction only. d. pulling in one direction only. e. pushing or pulling.

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Which of the following statements about axonal membranes is NOT true?

A. The sodium-potassium pump establishes a concentration gradient across the membrane. B. The resting potential of a typical neuron is -70 mV. C. There is an electrical potential difference across a neuron's membrane. D. The polarity correlates with a difference in ion distribution across the membrane. E. At rest, there is a higher concentration of sodium ions inside the axon.

Biology & Microbiology