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SECTION I. CELLULAR & MOLECULAR BASIS FOR MEDICAL PHYSIOLOGY

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The membrane potential of a particular cell is at the K+ equilibrium. The intracellular concentration for K+ is at 150 mmol/L and the extracellular concentration for K+ is at 5.5 mmol/L. What is the resting potential?

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A. –70 mV

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B. –90 mV

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C. +70 mV

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D. +90 mV

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The difference in concentration of H+ in a solution of pH 2.0 compared with one of pH 7.0 is

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A. 5-fold

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B. 1/5 as much

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C. 105-fold

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D. 10-5 as much

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Transcription refers to

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A. the process where an mRNA is used as a template for protein production.

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B. the process where a DNA sequence is copied into RNA for the purpose of gene expression.

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C. the process where DNA wraps around histones to form a nucleosome.

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D. the process of replication of DNA prior to cell division.

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The primary structure of a protein refers to

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A. the twist, folds, or twist and folds of the amino acid sequence into stabilized structures within the protein (ie, α-helices and β-sheets).

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B. the arrangement of subunits to form a functional structure.

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C. the amino acid sequence of the protein.

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D. the arrangement of twisted chains and folds within a protein into a stable structure.

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Fill in the blanks: Glycogen is a storage form of glucose. _______ refers to the process of making glycogen and _______ refers to the process of breakdown of glycogen.

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A. glycogenolysis, glycogenesis

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B. glycolysis, glycogenolysis

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C. glycogenesis, glycogenolysis

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D. glycogenolysis, glycolysis

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The major lipoprotein source of the cholesterol used in cells is

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A. chylomicrons

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B. intermediate-density lipoproteins (IDL)

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C. albumin-bound free fatty acids

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D....

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