Which of the following statements is true of all enzymes? A They are soluble in water. B They have a quaternary structure. They have only one active site. They catalyse anabolic reactions. C D
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Proteins
We generally tend to think of proteins only from a dietary lens, as a component of what we eat. However, they are among the most important and abundant organic macromolecules in the human body, with diverse structures and functions. Every cell contains thousands and thousands of proteins, each with specific functions. Some help in the formation of cellular membrane or walls, some help the cell to move, others act as messages or signals and flow seamlessly from one cell to another, carrying information.
Protein Expression
The method by which living organisms synthesize proteins and further modify and regulate them is called protein expression. Protein expression plays a significant role in several types of research and is highly utilized in molecular biology, biochemistry, and protein research laboratories.
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- Which of the following is true of all allosteric enzymes? They have more than one active site on each subunit. They consist of proteins only. They have a nonprotein portion. Binding at one site affects the protein function at a second site. Which of the following explains why glycosides do not undergo mutarotation? There are no longer any stereocenters. There is no longer an anomeric carbon. The ring structure does not open to become the open-chain structure. None of the above is correct.Which of the following statement/s is/are TRUE of enzymes? 1. They increase the rate of reaction by stabilizing the transition state. II. They raise activation energy to shift the equilibrium to favor the products. . They lower activation energy by altering the products of a reaction. O l and III O Il and III O III only o l onlyWhich of the following is a mechanism of catalysis by co-enzymes? 1. They form intermediate covalent bond with the substrate molecules. II. They polarize bonds because of their electrophilic nature. III. They facilitate electron transfer. Select the correct response: I and II I, II, and III I only II and III II only
- The following statements are either True or False. Please label accordingly. a. L-Amino reductase is an enzyme. b. Allosteric enzymes are composed of two or more protein chains. Heavy metals are examples of inhibitors. They function by binding to sulfur on cysteine amino acid residues. C. d. A reversible noncompetitive inhibitor temporarily blocks an enzyme's active site. Enzymes don't denature as easily as smaller proteins when heated or stressed due to their complex secondary and tertiary structure. e. Oxidative phosphorylation is the biochemical process by which ATP is synthesized from ADP when protons cross the inner mitochondrial membrane. f. g. DNA and RNA strands differ only in the fact that DNA forms a double helix. h. There is no secondary structure in RNA strands.Which of the following is a primary function of the active site of an enzyme? a. It binds allosteric regulators of the enzyme. b. It binds noncompetitive inhibitors of the enzyme. c. It catalyzes the reaction associated with the enzyme. d. It is activated by the presence of the end product of the metabolic pathway in which the enzyme is involved. Clear my choice Question 2 Not yet answered Points out of 2.00 Flag question Question text Which of the following statement about the mass spectrometry is true? a. Large amount of protein sample is needed for mass spectrum, and thus it is very expensive. b. It is a powerful method to determine the 3-dimensional structure of proteins. c. It can be sued for protein location in a living cell. d. It can be used to measure the molecular weight of proteins. e. It can be used to determine the stability of a protein structure in solution. Clear my choice…Which of the following is incorrect about enzyme cofactors? a. Some can be metal ions b. None; all the other choices are correct O c. The so-called co-substrates are needed in equal [substrates] and they are not recycled Od. Some are called coenzymes which are classified into co-substrates and prosthetic groups +
- Many pharmaceuticals exert their action by inhibiting the activity of enzymes. Choose the false statement regarding enzyme inhibition. A- Enzyme can be inhibited by a ligand that binds to an active site B- Enzyme can be inhibited by a ligand that binds to a site other than that of substrate C- Enzyme can be inhibited by a ligand that forms a covalent bond with enzyme. D- It is true of all enzyme inhibitors, that the degree of inhibition is reduced when the concentration of inhibitor is lowered by metabolism or E- Enzyme may be inhibited by a ligand that does not bind in the substrate siteThe following statement can be said about enzymes: A. lowers activation energy of reactions B. regulates chemical activities in the body C. 3D shape is essential for normal function D. all of these E. B and C onlyWhat is the function of each of the following?a. glycocorticoidb. ketone bodiesc. biotransformationd. phase I reactione. ACP
- As biological catalysts, enzymes play a fundamental role in many cellular processes. Which of the following statements about enzymes is correct? 1. Enzymes are essential for anabolic pathways; they are not required for catabolic pathways. 2. While an increase in temperature can increase the rate of an uncatalyzed reaction, it can’t increase the rate of an enzyme-catalyzed reaction. 3. Enzymes force substrates into unique conformations that do not occur in the absence of an enzyme. 4. Enzymes decrease the free energy of a reaction’s transition state. A. 1, 2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. All of 1, 2, 3 and 4 are correctIn which of the following is the pairing between enzyme type and enzyme function incorrect? mutase - conversion of one structural isomer into another O oxidase - oxidation of a substrate carbohydrases - hydrolysis of glycosidic bonds in carbohydrates O dehydrogenase - removal of water from substratehich of the following are advantages of quaternary structure? Choose all correct nswers 1) The genes may be for single subunits, rather than requirement for transcription and translation of giant sequences 2) Subunit construction may provide the structural basis for protein regulation 3) Multi-subunit proteins are more water soluble than single subunit proteins of the same size 4) Defects in protein synthesis may be fixed at the subunit level, rather than giant polypeptide level 5) May have multiple active sites - one on each subunit