Multiple Choice: Read each question carefully and select the best answer.1. When will a protein have the lowest solubility?A. when the pH is above the isoelectric pointB. when the pH is below the isoelectric pointC. at neutral pHD. at isoelectric pH2. Which of the following is true of proteins?A. all proteins are acidicB. all proteins are basicC. all proteins are neutralD. the acid/base properties of a protein depend on the identity of its side chains_3.Which of the following correctly describes relationship between the primary structureof a protein and protein function?A. changing one amino acid always affects protein functionB. only when changing more than one amino acid will have an affect proteinfunctionC. changing one amino acid never affects protein functionD. there is no relationship between primary structure and protein functionfor the next 7 items, refer to the figure below:2Cyst - Tyr834Ile - Gln - Asn - Cyst - Pro - Leu - Gly - NH:69Охytocin(Human)345689Cyst - Tyr - Phe - Gin - Asn - Cyst - Pro - Arg - Gly - NH:Arginine Vasopressin(Human)4.These molecules are:A. proteinsB. nonapeptideC. polypeptideD. amino peptide_5.What is the classification of these molecules based on function?C. hormonesA. Structural proteinsB. antibodyD. enzymeWhat is the classification of these molecules based on composition?A. pureB. simple6.C. conjugatedD. compound_7.What is the classification of these molecules based on composition?C. conjugatedD. compoundA. pureB. simpleWhat chemical bond/s is/are presentin these peptides?A. peptide bond onlyB. disulfide bond only_8.C. peptide bonds anddisulfide bondsD. glycosidic bond_9.Which of these peptides contain an amino acid with a side chain IMIDAZOLE?C. Hard to tellD. Either A or BА. ОхytocinB. VasopressinBased on amino acid composition, what is the overall charge of vasopressin?A. NegativeВ. Positive_10.C. NeutralD. Either A or B

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Biochemistry

1. When will a protein have the lowest solubility?

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Concept explainers

Nucleotides

It is an organic molecule made up of three basic components- a nitrogenous base, phosphate,and pentose sugar. The nucleotides are important for metabolic reactions andthe formation of DNA (deoxyribonucleic acid) and RNA (ribonucleic acid).

Nucleic Acids

Nucleic acids are essential biomolecules present in prokaryotic and eukaryotic cells and viruses. They carry the genetic information for the synthesis of proteins and cellular replication. The nucleic acids are of two types: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The structure of all proteins and ultimately every biomolecule and cellular component is a product of information encoded in the sequence of nucleic acids. Parts of a DNA molecule containing the information needed to synthesize a protein or an RNA are genes. Nucleic acids can store and transmit genetic information from one generation to the next, fundamental to any life form.

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