Question 1Amyloid Precursor Protein (APP) is actually thought to be a natural neuroprotective agent induced by neuronal stress or injury.O TrueO FalseQuestion 2Which of the following is not a property of serine protease?A globular protein with high molecular weight● It is initially synthesized as a zymogenIt has uniquely activated tyrosine residue at the active siteCleaves polypeptide at a specific amino acid residueQuestion 3RTK is activated by cyclic AMP.O TrueFalse

A protein's biological function depends on its three-dimensional structure. The 3D structure is…

Answered: Question 1 Amyloid Precursor Protein…

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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QUESTION NO. 1L-Carnitine is synthesized primarily in the liver but also in the kidneys and then transported to other tissues. It is most concentrated in tissues that use fatty acids as their primary fuel, such as skeletal and cardiac muscle. In this regard, L-carnitine plays an important role in energy production by conjugating to fatty acids for transport from the cytosol into the mitochondria. L-carnitine shuttle is an example of A. ion driven active transport B. facilitated diffusion C. simple diffusion D. ATP driven active transportE. symport F. antiportQUESTION NO.2 Statements: (1) Glucose is both a hexose and a aldose. (2) There can never be more than three enantiomers for a molecule. (3) All common disaccharides have beta-one-four linkages. Which statements are true?
Question 15 Activities found in the rough ER and its functions include the folllowing EXCEPT provides a membrane binding site for the RNA with signal a signal sequence facilitates post-translational modifications allows the entry of polypeptides that will undergo glycosylation provides a membrane scaffold for binding of ribosomes for protein synthesis
QUESTION NO. 1 Much of procollagen formation occurs in the endoplasmic reticulum and Golgi apparatus which requires signal peptide. All of the following statements about targeting a protein for the ER are true except A. signal peptide usually has a positively charged N-terminus and a stretch of hydrophobic amino acids. B. signal peptide emerging from a free ribosome binds signal recognition particle (SRP). C. signal peptide is usually cleaved from the protein before the protein is inserted into the ER membrane. D. docking protein is actually an SRP receptor and serves to bind the SRP to the ER. E. SRP and docking protein do not enter the ER lumen but are recycledQUESTION NO. 2 All of the following statements about telomerase are correct except A. the RNA component acts as a template for the synthesis of a segment of DNA. B. it adds telomeric repeats to the 5'-ends of the DNA strands. C. it provides a mechanism for replicating the ends of linear…
Question: A decapeptide composed of ser, ala, IIe. his, trp, phe was treated with 1-flouro- 2,4-dinitrobenzene. It gave a DNP-his on the N terminal and free trp when treated with carboxypeptidase. Upon partial hydrolysis of the peptide, the following fragments were obtained. a. his-lle-phe-ala c. his-ala-phe e. ser-lle-his b. ala-phe-trp d. phe-ala-ser Give the amino acid sequence of the above decapeptide.
QUESTION 16 Peptidyl transferase activity (peptide bond enzyme activity) is associated with what site in the ribosome? E P A X
QUESTION 12 The leucine zipper domain of transcription factors is not involved in DNA recognition but rather in facilitating dimerization. Given the chemical properties of the amino acid leucine, dimerization of transcription factors via this domain by (select the correct option). Facilitating hydrogen bonding with the aqueous environment. Chelation of bivalent ions such as Zn2+. Formation of coiled-coils through hydrophobic non-covalent interactions between evenly spaced Leu residues in alpha-helical domains. Physically connecting the two transcription factor subunits through unstructured loops.
QUESTION 22 When the final product of a series of enzymatically-catalyzed reactions binds to the first enzyme in the pathway to limit its production, it generally uses ___ because the structure of this final product is generally not similar to that of any of the enzyme's normal substrates. Allosteric activation Zymogen activation Covalent modification Competitive inhibition Allosteric inhibition
Question 1Predicting Secondary Structure Which of the following peptides is more likely to take up an -helical structure, and why? (a) LKAENDEAARAMSEA (b) CRAGGFPWDQPGTSN
Question: A gene can best be described as a segment of DNA that A. Transcribed B. Is transcribed as well as the associated regulatory regions C. Encoded for a protein or functional RNA D. Encoded for a protein C. Encoded for a protein as well as the associated regulatory regions Choose the Correct with explanation
Question:- The enzyme aromatase is found in the cytoplasm of some cells and converts testosterone to estrogen. You decide to test aromatase from a particular cell, and oops, your lab partner admits he drastically increased the pH in all the test tubes. Which of the following is a likely result? a. The enzyme will be denatured and the substrate will not bind to the active site. b. The enzyme will convert testosterone to estrogen at a faster rate. c. The mistake will have no effect on the experiment, because enzymes are not sensitive to pH. d. The free energy will be lowered and the reaction will not proceed spontaneously.
Question 1: Your research project is concerned with the expression and purification of a protein called aldehyde dehydrogenase. Describe in detail all steps required from gene amplification to characterisation of the purified 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

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