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单选题 When pH = pI, the net charge of a protein is _____
学科：Biochemistry 《生物化学》一 专业基础课（全英教学）
时间：2025-04-26 11:45:09
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题目1单选题
Electrophoresis separates proteins on the basis of _________________A. mass or 3D structureB. mass or chargeC. 3D structure or chargeD. mass or 2D structure
题目2单选题
____ cysteines form a cystine by reversible formation of a disulfide bond via oxidationA. 2B. 3C. 4D. 5
题目3单选题
Desmosine is formed from ___ lysine residues, which is found in the fibrous protein elastinA. 2B. 3C. 4D. 5
题目4单选题
When a series of related nucleic acid or protein sequences are compared, a ____________ sequence is the one that reflects the most common base or amino acid at each positionA. consensusB. signatureC. repeatD. nonconsensus
题目5单选题
_______________ is the most common type of regulatory modification of proteinsA. AcetylationB. PhosphorylationC. GlycosylationD. Prenylation
题目6单选题
The one-letter code for 20 amino acids was devised by the American biochemist Margaret Oakley Dayhoff, considered by many to be the founder of the field of bioinformatics. Q is ____A. GlyB. GlnC. GluD. Pro
题目7单选题
Ion-exchange chromatography separates proteins based on their differences in _____________________A. net electric chargeB. sizeC. binding affinityD. number of amino acid residues
题目8单选题
When pH = pI, the net charge of a protein is _____A. 0B. 1C. 2D. 3
题目9单选题
After removal of the precursor signal peptide, human proinsulin is post-translationally cleaved into three peptides: the B chain and A chain peptides, which are covalently linked via two disulfide bonds to form insulin, and C-peptide. So human insulin contains ____ chainsA. 1B. 2C. 3D. 4
题目10单选题
The one-letter code for 20 amino acids was devised by Margaret Oakley Dayhoff, considered by many to be the founder of the field of bioinformatics. K is ________A. LeuB. LysC. ArgD. His
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