WHAT IS LIFE LL W/ LAUNCHPAD
4th Edition
ISBN: 9781319231859
Author: PHELAN
Publisher: Macmillan Higher Education
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Chapter 3, Problem 8MC
Summary Introduction
Introduction:
Proteins are the building blocks of the body.
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Synthesis of proteins requires the input of energy, which can be provided by: a. enzymes b. synthesis of ATP from ADP and Pi c. hydrolysis of ATP to form ADP and Pi d. amino acids e. isotopes
Which of the following is not a function of a protein?
A. Long term energy storage
B.Repair body tissues
C.Allows metabolic reactions to take place
D.They catalyze reactions
Which of the following is true about the phosphorylation of proteins?
A. Proteins are usually phosphorylated at amino acids that have hydroxyl group-containing side chains.
B. Phosphorylation of proteins is catalyzed by phosphatases.
C. Phosphoryation always activates enzymes.
D. The specificity in phosphorylation is conferred solely by the amino acid to be phosphorylated.
Chapter 3 Solutions
WHAT IS LIFE LL W/ LAUNCHPAD
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- Protease acts on proteins to convert them into amino acids. Which of the following statements is correct? a. Protease is produced in the salivary glands. b. All of the answers. c. The enzyme is protease and amino acids are the products. d. Amino acid is the substrate which acts on the enzyme. e. Protease is the substrate while amino acids are the products.arrow_forwardWhich of the following statements is False?a. Carbohydrates are the most efficient energy-storagemolecules by weight.b. Intrinsically disordered protein segments have mostlyhydrophilic amino acids.c. Nucleotides may act as energy-carrier molecules.d. Very acidic or salty solutions may denature proteins.arrow_forwardWhich of the following is a drawback of using base hydrolysis during amino acid composition? A. Protonation of basic amino acids. B. Dissociation of acidic amino acids. C. Denaturation of the protein. D. Racemization of certain amino acids.arrow_forward
- Which of the following is not true about enzymes? a. They are consumed by the reactions they catalyze. b. They are usually made of amino acids. c. They lower the activation energy of chemical reactions. d. Each one is specific to the particular substrate(s) to which it binds.arrow_forwardWhich of the following can be used to synthesize fatty acids? a. Glucose c. Both a and b b. Amino acids d.Neither a nor barrow_forwardWhich of the following describes a purpose of the glycosylation of proteins? A. Glycosylation tags a protein for destruction within a cell. B. Glycosylation is a process that causes cells to import new proteins from the extracellular space. C. Glycosylation indicates where a protein belongs within a cell. D. Glycosylation is the process of bonding amino acids to each other to build a protein.arrow_forward
- Among the given statements, which ones are correct about the biological functions and commercial uses of carbohydrates? A. Glucose serves as the substrate for photosynthesis in plants. B. Glycogen serves as a repository of glucose in the myocytes. C. The cell wall of plants is reinforced by a polymer of beta-D-glucose. D. Lactose is widely used as filler in tablets and capsules in the pharmaceutical industry. E. Corn extract is commercially hydrolyzed to yield fructose-rich sweeteners.arrow_forwardWhich of the following statements about amino acids is/are incorrect? 1. Standard amino acids are so named because these are the only amino acids there are. 2. Essential amino acids can be synthesized by the organism. 3. All standard amino acids are optically active. 4. Overall, naturally occurring amino acids are equally likely to be found having either an R or S configuration around the alpha carbon. O 1, 3, and 4 O 1, 2, 3, and 4 1 and 2 O 1, 2, and 3arrow_forwardA cofactor is a __________. An example of a cofactor is _________. Select one: a. protein that requires another molecule for activity, hemoglobin b. protein that requires another molecule for activity, iron c. protein that requires another molecule for activity, pyruvate dehydrogenase d. a molecule required by another protein for activity, niacin e. a molecule required by another protein for activity, pyruvate dehydrogenasearrow_forward
- Cells need to be buffered because A. they need to be able to increase or decrease their cytosolic pH to adapt to various environmental conditions. B. their proteins work best at low pH. C. they need to maintain a specific cytosolic pH to keep biomolecules from being ionized. D. they need to maintain a specific cytosolic pH to keep biomolecules at their optimal ionic state.arrow_forwardAmino acidsa. are classified as essential or nonessential.b. can be synthesized in a transamination reaction.c. can be used as a source of energy.d. can be converted to keto acids.e. All of these are correct.arrow_forwardIndicate whether each of the following statements about an enzyme active site is true or false. a. It is the location where substrate molecules are produced. b. It always has a fixed, rigid geometry. c. It always has a geometrical shape exactly complementary to that of substrate. d. It always accomodates several structurally related substrates. e. It is the location where substrate molecules are converted to product molecules. f. It always has a shape that has a degree of flexibility to it. g. it always accomodates only one specific substrate.arrow_forward
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