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单选题 By far the most common modifications are phosphorylation and dephosphorylation; up to ____ of the proteins in a eukaryotic cell are phosphorylated under some circumstances
学科：Biochemistry 《生物化学》一 专业基础课（全英教学）
时间：2025-06-08 15:17:14
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题目1单选题
Pyruvate kinase is activated by _____________________A. ATPB. acetyl-CoAC. long-chain fatty acidsD. fructose 1,6-bisphosphate
题目2单选题
In humans, about ______ genes (~12% of all genes) encode regulatory proteins, including a variety of receptors, regulators of gene expression, and more than 800 different protein kinasesA. 1,000B. 1,500C. 2,000D. 2,500
题目3单选题
Average half-life of proteins in mammalian liver is ____ day(s)A. 0.9B. 1.7C. 4.6D. 10.7
题目4单选题
Average half-life of proteins in mammalian brain is ____ day(s)A. 0.9B. 1.7C. 4.6D. 10.7
题目5单选题
Average half-life of proteins in mammalian muscles is ____ day(s)A. 0.9B. 1.7C. 4.1D. 10.7
题目6单选题
For an allosteric enzyme with a Hill coefficient of ___, activity increases from 10% Vmax to 90% Vmaxwith only a 3-fold increase in [S], compared with the 81-fold rise in [S] needed by an enzyme with no cooperative effects (Hill coefficient of 1)A. 2B. 3C. 4D. 5
题目7单选题
By far the most common modifications are phosphorylation and dephosphorylation; up to ____ of the proteins in a eukaryotic cell are phosphorylated under some circumstancesA. 1/4B. 1/3C. 1/2D. 3/4
题目8单选题
The levels of ATP and AMP are a sensitive reflection of a cell's energy status, and when the [ATP]/[AMP] ratio decreases, the AMP-activated protein kinase (AMPK) triggers a variety of cellular responses to _____________________A. raise both [ATP] and [AMP]B. raise [ATP] and lower [AMP]C. lower both [ATP] and [AMP]D. lower [ATP] and raise [AMP]
题目9单选题
Quantitative data on metabolic flux can be used to calculate a flux control coefficient, C, for each enzyme in a pathway. This coefficient expresses the relative contribution of each enzyme to setting the rate at which metabolites flow through the pathway—that is, the flux, J. C can have any value from ___ (for an enzyme with no impact on the flux) to ___ (for an enzyme that wholly determines the flux)A. 0, 1B. 0, 5C. 0, 10D. 0, 100
题目10单选题
The elasticity coefficient, ε, expresses quantitatively the responsiveness of a single enzyme to changes in the concentration of ametabolite or regulator; it is a function of the enzyme's _____________________A. total kinetic propertiesB. intrinsic regulating propertiesC. intrinsic kinetic propertiesD. external kinetic properties
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