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30 Cards in this Set
- Front
- Back
Where are the two major sites for glycogen storage in humans
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Liver and Muscle
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Which of the following statements regarding glycogen metabolism is FALSE
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In muscle, glycogen synthesis is activated by Ca2+ ions
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Which is not a structural feature of cholesterol?
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Aromatic ring
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Main function of the pentose phosphate pathway is to:
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Supply pentose and NADPA
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Which of the following statements regarding gluconeogenesis is FALSE
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Gluconeogenesis consumes a net of 1 CO2 molecules
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Which of the following statements about the pentose phosphate pathway is incorrect
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It requires the participation of molecular oxygen
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What is the energetic cost of running the Cori cycle, per glucose molecule?
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4 ATP equivalents
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Which of the following types of membrane organizaiton must be due to a transport process?
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Lipid asymmetry in each leaflet of a bilayer
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Which fatty acid would have a melting temperature higher than that of palmitic acid (16:0)?
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Stearic Acid (18:0)
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Which pair below correctly matches an enzyme with its allosteric activator?
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pyruvate kinase / ADP
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tRNA molecules are extensively base-paired and are stabilized by
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hydrogen bonds and stacking interactions.
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Fat is a more efficient store of energy than carbohydrate. Which of the following is NOT a factor in this?
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Fat is catabolized only aerobically; carbohydrate can be catabolized anaerobically.
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Which of the following amino acids contribute atoms utilized in purine biosynthesis?
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Asp, Gly, Gln
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Which of the following statements about zinc fingers is false?
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Zinc fingers are the predominant DNA-binding motif of restriction enzymes.
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What is the oxidizing agent that is a product of xanthine oxidase?
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H2O2
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Histone H1 binds to a DNA segment called
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Linker DNA
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Which of the following forces contributes most significantly to the stabilization of the structure of double-stranded DNA?
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Base stacking interactions or van der Waals interactions.
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What evidence can be used to support the contention that Z-DNA has a biological function?
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A protein has been identified that binds to Z-DNA.
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During starvation, what is the MAJOR fuel source for the production of ketone bodies?
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fats stored in adipose tissue.
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The major site of formation of acetoacetate from fatty acids is:
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Liver
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The term rRNA refers to ______ RNA.
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Ribosomal
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The presence of proflavin is likely to induce
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more than one of the above.
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Pol I synthesizes new DNA with very high fidelity, due to its
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Proofreading capabilities
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In prokaryotes, RNA polymerase binds to nucleotide sequences known as ______ that are recognized by the corresponding sigma factor.
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Promoters
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Transcriptional activators that can have variable positions and orientations are called
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Enhancers
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Which of the following offers the best description of a Pribnow box?
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An AT-rich sequence located at approximately -10.
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E. coli leading and lagging strand synthesis takes place at the
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multisubunit replisome.
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Which of the following factors mediates splicing?
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snRNPs
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DNA is unwound by
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helicases.
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Pol I is proteolytically cleaved to yield the ____, which lacks 5??3? exonuclease activity.
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Klenow fragments
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