hich of the following are advantages of quaternary structure? Choose all correctnswers1) The genes may be for single subunits, rather than requirement fortranscription and translation of giant sequences2) Subunit construction may provide the structural basis for protein regulation3) Multi-subunit proteins are more water soluble than single subunit proteins ofthe same size4) Defects in protein synthesis may be fixed at the subunit level, rather thangiant polypeptide level5) May have multiple active sites - one on each subunit Which of the following statements are correct of enzymes that are isoenzymes ofeach other? Choose all correct answers.Isoenzymes are encoded by the same gene (DNA)Isoenzymes are affected by the exact same allosteric effectorsIsoenzymes may be subject to different types and levels of regulationIsoenzyme catalyse the same biochemical reactionsIsoenzymes have different primary structures.

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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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Free ribosomes in the cytosol and ribosomes bound to the ER membrane have: 1) different types of small subunits but the same large subunits 2) the same types of large and small subunits 3) different types of large and small subunits 4) different types of large subunits the same small subunits
1. When a protein is attached with ubiquitin it is targeted for one of the following? a) For degradation b)For packaging c)For exocitosis d)To be stored 2. A covalent bond between a negatively charge chemical and the side chain of a protein occurs in one of the following? a) Between the allosteric modulator and the regulatory site b) In the functional site of a protein c) During the process of cooperativity among proteins d)When a phosphorus group is attached to a OH group by a protein kinase
If you did a classic Pulse-Chase experiment to follow the path of a secreted protein, and you forgot to do the Chase, which of the following would you observe? No radioactivity would be seen in any of the structures. Radioactivity would increase first in rough ER, then Golgi Complex, then secretory vesicles, but it would remain high in all, never decreasing. Nothing would change Radioactivity would increase in all 3 structures simultaneously and stay high.
a) How to transfer biological information in protein synthesis? What is the link between DNA and proteins? What role does RNA play in each? Explain the protein synthesis.
In animal cells, enzymes synthesized to hydrolyze polymers to form monomers. This process involves the RER, the SER and the Golgi apparatus. In which of the following is the molecule listed for this process employed by the cells of the organ indicated? a) formation of Fatty acids by lipases in the small intestine. b) production of glucose from glycogen by the liver. c) formation of amino acids by proteases in the small intestine d) formation of monosaccharides by Carboxylases in the mouth and small intestine. e) all are possible
Based on image of protein (enzyme), need to know: a) Number of amino acids and length (Angstroms) of helix denoted as H2. b) Name the post-translational modification (PTM) the enzyme has underwent. c) Name chemical reagent to undo this PTM and number of equivalents of reagent needed.
Match the post-translational protein modification to its function. Creates new binding sites by neutralizing positive charges Form protein complexes through quatenary structures Protein localization in the endomembrane system Targets proteins for degradation Creates new binding sites by adding negative charges Lipid anchors Glycosylation Alkylation Polymerization Phosphorylation Aceylation Ubiquitination…
Consider five proteins with the properties shown in the following table. Answer the questions below about these proteins and justify your answers. Protein Subunit mass (Da) | Native mass (Da) 10,000 40,000 120,000 A 15,000 C 20,000 20,000 25,000 75,000 E 30,000 60,000 a) Which protein would migrate the slowest in an SDS-PAGE? Justify your results. b) Which protein would migrate the fast in a Native-PAGE? Justify your results.
Consider the synthesis of a polypeptide by a ribosome of a prokaryote cell. As the polymerization of amino acids to form a polypeptide chain occurs and the molecule is still completely linear, what is the level of structure in the protein? a) primary, b) secondary, c) tertiary, d) quaternary, e) Because they are ionic, they only form crystals.
Which of the following statements are true? Electrostatic interactions are the dominant forces in protein molecular recognition. When two proteins form a complex there is an unfavorable loss of rotational-translational entropy. Protein-protein interfaces are most often dry. The exclusion of water results in an unfavorable loss in rotational-translational entropy. The free energy change associated with the formation of an enzyme-substrate complex almost always results in an unfavorable reduction in conformational entropy of the proteins. Burial of an uncompensated positive charge inside proteins is usually unfavorable. So-called van der Waals’ interactions are essentially electrostatic in origin. Steric complementarity of the two partners forming a complex is essential to achieve optimal free energy of binding. Structural models of proteins obtained from low temperature crystallography are excellent descriptions of all biochemically relevant aspects of their function.
which statement about genetic code is not true? A) mRNA is read 3 bases at a time, which are called codons. B) There is one initiator codon that codes for an amino acid. C) Each amino acid is coded for by only one codon. D) There are 3 termination codons that do not code for amino acids. E) Each codon is specific for only one amino acid. An anion has an equilibrium potential of -40 mV. What direction are the chemical and electrical forces acting on the anion at the resting membrane potential (-70 mV)? A) Both the chemical and electrical forces are directed out of the cell. B) The chemical force is directed out of the cell and the electrical force is directed into the cell. C) The chemical force is directed into the cell and the electrical force is directed out of the cell. D) There is insufficient information to answer this question. E) Both the chemical and electrical forces are directed into the cell.
Describe the process of protein synthesis and localize where each step takes place. Make sure to describe and use the following terms: Translation: mRNA to proteins (cytoplasm) mRNA w/codon, ribosomes, tRNA w/anticodon and amino acid, protein with 3D structure

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