Which of the following best describes an amino acid that can be used to synthesize proteins?
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- Question 17 Which of the following are true regarding proteins? Select all that apply. O the amino group is responsible for forming the peptide bonds when synthesizing proteins O a mild increase in temperature may increase the kinetic energy of an enzyme and increase its function O catabolism of proteins involves hydrolysis Oa drastic change in pH will not affect the structuire but it will affect the function of a protein O proteins are made up of chains of nucleotides O the tertiary structure of a protein determines the function of the proteinQuestion 9 Choose the CORRECT statement. O A polypeptide chain may have abrupt changes in direction and restriction in geometry because of the presence of glycine O A polypeptide chain may have abrupt changes in direction and restriction in geometry because of the presence of valine O A polypeptide chain may have abrupt changes in direction and restriction in geometry because of the presence of arginine O A polypeptide chain may have abrupt changes in direction and restriction in geometry because of the presence of prolineQUESTION 4 Which of the following amino acids would stick to a CM-sepharose column at pH 7.07 Choose all that apply. Partial credit is allowed for each correct answer, arnd negative scores are allowed for incorrect answers. O Arginine (pl -10.76) O Glutamic acid (pl 3.22) O Cysteine (pl 5.07) O Histidine (pl 7.59)
- 5 pts Question 9 95 58 40 HS HS SH 65 8 M urea and 72 B-mercaptoethanol 65 Hs84 Hs- SH 72 26 HS 110 SH 84 26 110 95 124 40 58 Native ribonuclease Denatured reduced ribonuclease Figure 2.53 Biochemistry, Seventh Edition O 2012 W. H. Freeman and Company The image above shows how Anfinsen unfolded ribonuclease for his classic experiment to see if proteins contain all necessary information for adopting their folded states on their own. To achieve proper refolding and ribonuclease activity, Anfinsen must have: trick question: ribonuclease cannot adopt its folded state without the help of cellular machinery removed the mercaptoethanol followed by the urea very carefully removed both the urea and mercaptoethanol at the same time removed the urea followed by the mercaptoethanolQUESTION 4 What percent are the following two 20 amino acid peptides similar? MTEKRVQDKAKLIVDEQACT MTDVRIQERTKLKVFEQLCI O 25% O 25% O 75% 90%QUESTION 38 Which of the following amino acids is the least abundant in proteins? V W A G
- Question 1 Amyloid Precursor Protein (APP) is actually thought to be a natural neuroprotective agent induced by neuronal stress or injury. O True O False Question 2 Which of the following is not a property of serine protease? A globular protein with high molecular weight ● It is initially synthesized as a zymogen It has uniquely activated tyrosine residue at the active site Cleaves polypeptide at a specific amino acid residue Question 3 RTK is activated by cyclic AMP. O True FalseQuestion 22: which of the following secondary structures would you expect to find on the surface of a globular protein? Alpha helix Beta sheet Loops between two alpha-helices None of the above because water would disrupt the hydrogen bonding that stabilizes these structures A,B and C as long as the polar and charged amino acid side chains face the surface of the protein.Question 11. // Hint: Isoelectric focusing separates proteins based on their pI values, and can separate proteins that only differ by a net charge of ±1.±1. Recall that an amino acid residue with a negatively charged R group has a relatively low isoelectric point (pI) where it has zero net charge. Likewise, an amino acid residue with a positively charged R group has a relatively high isoelectric point (pI) where it has zero net charge. Order from Low pH to High pH
- Question 14 The folding of an unfolded protein proceeds from low entropy disordered state to a single high entropy, low energy native conformation O True O False Question 15 The GroES subunit has 14 identical 549-residue subunits arranged in two stacked rings with 7 subunits eac True FalseQUESTION 1 Which of the following concepts in column A best fits the concept in column B. p-Nitrophenyl a-D-Glucoside Action of intracellular a-GLUCOSIDASE + NaHCO3 Boiling cells Tris-pH 5.0 A. Substance that act as molecular mimic of a maltose molecule B. Develops TT-Nitrophenyl into a yellow colour reagent for measurement at 400nm c. Breaks the a-linkages of p-Nitrophenyl a-D-Glucoside, leaving p-Nitrophenyl and a glucose molecule D. Allows transport of p-Nitrophenyl a-D-Glucoside across the membrane E. Stop the reaction and release internal p-NitrophenylQuestion 3 of 3 > r: te e Select the true statements about protein secondary structure. IS IS In a B-pleated sheet, the side chains are located between adjacent segments. Peptide bonds stabilize secondary structure. The secondary level of protein structure refers to the spatial arrangements of short segments of the protein. In an a-helix, the side chains are located on the outside of the helix. The a-helix is held together by hydrogen bonds between the amide N-H and C=0 groups. earning, Inc. privacy policy terms of use contact us help about us careers 112 30 FEB 2 4.