Home > Uncategorized > Mid term Biochemistry Mid term Biochemistry Welcome to your Mid Term Biochemistry Name Roll Number Email Phone# 1. At neutral pH amino acids usually present in the form ofNeutral molecules with no charge on itNeutral molecules with positive charge on itNeutral molecules with negative charge on itNeutral molecules with positive as well as negative charge on itNegatively charged molecule 2. the amino acids may be polar or non polar some amino acids contain OH group in their side chains one of these istyrosinealanineAspartateGlutamate 3. Amino acids are not only present in proteins but may also act as neurotransmitters such asGlycal alaninebutyric acidGlutamateGABA 4. some of the amino acids are very common while some are rare amino acids, one of the rare amino acid isProlineLysineHydroxyprolineTyrosineLysine 5. the hydrophobic amino acids tend to fold and tightly packed in 3D structure in aqueous environment, which pair of amino acids is hydrophobic in natureTryptophan and phenylalanineGlycine and ProlineThreonine and Aspartic acidMethionine and Hitidine 6. Separation and purification methods of proteins depends upon which of these physical propertiesSizeChargeSolubilitySize and chargesize and solubility 7. Proteins vary greatly in mass but not in -------ChargeSizeSolubilityDensity 8. Protein are purified on the bases of difference in their massesDifferential centrifugationFractionationRate zonal centrifugationUltracentrifugation 9. If protein has a net positive charge at pH7 it will usually binds to a column of beads containingamino groupscarboxylate groupsNa ionsion exchange 10. Salting out is a technique to purify proteins, it is also useful forcentrifugationconcentrating the proteinsseparation of soluble proteins from non-soluble proteinsall are true 11. ----- is responsible for specifying the 3D shape of a protein?Interaction with other polypeptidesInteraction with molecular chaperonsThe amino acid sequenceThe peptide bond 12. Which one is true about proteins?Proteins are made up of amino acids.Protein is the only nutrient that can build, repair and maintain body tissues.Proteins are essential for the development of skin, teeth and bones.All of the above 13. Which of the following statements is true about the (primary ) structure of proteinsThe helical structure of the proteinSubunit structure of the proteinThree-dimensional structure of the proteinThe sequence of amino acids joined by a peptide bond 14. Some polypeptide chains fold into two or more compact regions, these compact regions are calledDimersMotifDomainRibbon 15. Trehalose is disachharide that is made up of two glucose units with ----glycosidic bondalpha 1-2 glycosidic bondalpha 1-1 glycosidic bondalpha 1-4 glycosidic bondalpha 1-6 glycosidic bond 16. difference between cellulose and chitin isReplacement of the hydroxyl group at C3 with an acetylated amino groupReplacement of the hydroxyl group at C2 with an acetylated amino groupReplacement of the hydroxyl group at C5 with an acetylated amino groupReplacement of the hydroxyl group at C4 with an acetylated amino group 17. Each cellulose molecule in cell wall of plants is composed of100 to 200 glucose molecules1000 to 2000 glucose molecules2000 to 4000 glucose molecules3000 to 6000 glucose molecules 18. Sucrose is a disaccharide that is made up ofalpha 1-4 glucosidic bond between glucose and fructosealpha 1-2 glucosidic bond between glucose and fructosebeta 1-4 glucosidic bond between glucose and fructosebeta 1-2 glucosidic bond between glucose and fructose 19. Any change in the relative positions of the groups attached to any of the chiral carbon atoms in a Fischer projection produces either a differentenantiomer or a diastereomeroptical rotationsterioisomerspolarizability 20. is usually produced as intermediate product in pentose phosphate pathway and calvin cycleGlucoseErythoseFructoselactose Time is Up!