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chemistry QA

The formation of what color in the Benedict's test indicates a reducing sugar is present in solution? Question 1 options: A)        Bright yellow B)               Brick red C)        Silver D)              Blue


Question 2 (2 points) Saved Which is a nonhydrolyzable lipid? Question 2 options: A)       An eicosanoid B)              A phospholipid C)                A triacylglycerol D)          A wax


Question 3 (2 points) Saved Which statement is not true? Question 3 options: A)               Vitamin A is obtained from liver, oily fish, and dairy products. B)      Vitamin D helps regulate both calcium and phosphorus metabolism. C)                Vitamin E is an oxidizing agent, oxidizing the unsaturated side chains in fatty acids. D)      A severe deficiency of vitamin K leads to excessive and sometimes fatal bleeding, because of inadequate blood clotting.


 Question 4 (2 points) Saved What is the charge on a zwitterion? Question 4 options: A) Neutral B)           Positive C)                Negative D)        The charge or lack of charge varies depending on the amino acid.


Question 5 (2 points) Saved Which conditions are commonly diagnosed by measuring the levels of specific enzymes in the blood? Question 5 options: A)            High blood pressure B)  Heart attack C) Pregnancy D)     Migraines


Question 6 (2 points) Saved Hydrolysis of triacylglycerols in the body occurs with the aid of which reagent? Question 6 options: A)         Enzymes B)        Sulfuric acid C)  Bases D)              Oxidizing agents


Question 7 (2 points) Saved What is the N-terminal amino acid in the tetrapeptide glycylalanyisoleucylmethionine? Question 7 options: A)  Isoleucine B)      Glycine C)           Alanine D)          Methionine


Question 8 (2 points) Saved Which is not a reducing sugar? Question 8 options: A)            An aldopentose B)                Sucrose C)          Galactose D)      Glucose E)          Fructose


 Question 9 (2 points) Saved What wax is formed from palmitic acid [CH3(CH2)14COOH] and the alcohol CH3(CH2)21OH? Question 9 options: A) CH3(CH2)14COO(CH2)21CH3 B) CH3(CH2)21COO(CH2)21CH3 C)                CH3(CH2)14COO(CH2)14CH3 D)                CH3(CH2)21COO(CH2)14CH3


Question 10 (2 points) Saved What is the most common type of starch molecules? Question 10 options: A)                Amylopectin B) Amylose C)         Glycogen D)       Cellulose


Question 11 (2 points) Saved Which is not a naturally-occurring polysaccharide? Question 11 options: A) Cellulose B)                Starch C)             Maltose D)         Glycogen


Question 12 (2 points) Saved Which is a hydrolyzable lipid? Question 12 options: A)          A fat-soluble vitamin B) A steroid C)            An eicosanoid D)             A triacylglycerol


Question 13 (2 points) Saved Which is not an anabolic steroid? Question 13 options: A)  Tetrahydrogestrinone B)                Cortisone C)       Nandrolone D)  Stanozolol

Question 14 (2 points) Saved How many fatty acids are required to form a triacylglycerol?

Question 14 options: A)                2 B)       3 C)       4 D)       1


 Question 15 (2 points) Saved What is the strongest type of interaction between two cysteine amino acid side chains in a protein? Question 15 options: A)          London dispersion forces B)        Hydrogen bonding C)     Electrostatic interactions D)  Disulfide bond


Question 16 (2 points) Saved What monosaccharide is found in cellulose, starch, and glycogen? Question 16 options: A)           Sucrose B)          Fructose C)         Glucose D)         Galactose

 

Question 17 (2 points) Saved Which statement concerning carbohydrates is incorrect? Question 17 options: A)                Carbohydrates serve important energy and structural roles for both plants and animals. B)                Monosaccharides are the simplest carbohydrates and are known as simple sugars. C)      Humans store excess glucose for short term energy requirements in the polysaccharide cellulose. D)   Carbohydrates that can be oxidized by Benedict's reagent are called reducing sugars.


Question 18 (2 points) Saved Which choice is the only amino acid capable of forming a disulfide bond? Question 18 options: A)         Cysteine B)         Serine C)             Methionine D)  Arginine


 Question 19 (2 points) Saved Based on its name, which compound is an enzyme? Question 19 options: A)                Triosephosphate isomerase B)  Dihydrofolate C)              Glucose D)         N-acetyl-D-glucosamine


Question 20 (2 points) Saved What hydrolysis products are formed when the wax CH3(CH2)18COO(CH2)17CH3 is treated with aqueous sulfuric acid? Question 20 options: A)         CH3(CH2)18COOH + CH3(CH2)16CH3 B)                CH3(CH2)18COOH + CH3(CH2)16CH2OH C)          CH3(CH2)18CH2OH + CH3(CH2)16COOH D)                CH3(CH2)18COOH + CH3(CH2)16COOH E)             CH3(CH2)18CHO + CH3(CH2)16CH2OH


Question 21 (2 points) Saved What process is used to move large polar molecules and ions, such as Cl– and HCO3–, through a cell membrane, traveling from the side of higher concentration to the side of lower concentration? Question 21 options: A)                Diffusion B)        Facilitated transport C) Active transport D)         Effusion


Question 22 (2 points) Saved Complete metabolism of a triacylglycerol yields which of the following? Question 22 options: A)         Fatty acids, H2O, and a great deal of energy B)   Fatty acids and a great deal of energy C)               CO2, H2O, and a great deal of energy D)          Glycerol, fatty acids, and a great deal of energy

 

Question 23 (2 points) Saved Which is not an example of a lipid? Question 23 options: A)               Vitamin E B)                Cholesterol C)   Phenol D)           Triacylglycerol


Question 24 (2 points) Saved Tuftsin is a peptide that stimulate and promotes the destruction of tumor cells. Its primary structure is Thr-Lys-Pro-Arg. Which statement is NOT a valid interpretation of its primary structure? Question 24 options: A)   Threonine is the N-terminal amino acid and arginine is the C-terminal amino acid. B)        It is a tetrapeptide. C)               The carboxyl group of lysine is joined to the amino group of proline. D)  The amino group of arginine is not joined to any other amino acid.


Question 25 (2 points) Saved Which structural feature is not found in sphingomyelins? Question 25 options: A)   A glycerol backbone B)      A phosphodiester C)      An amide bond D)           An alcohol