Which of the following statements is true for the class of biological molecules

Question

Which of the following statements is true for the class of biological molecules known as lipids? A) They are insoluble in water. B) They are made from glycerol, fatty acids, and phosphate. C) They contain less energy than proteins and carbohydrates. D) They are made by dehydration reactions. E) They contain nitrogen What is the term used for a proton molecule that assists in the proper folding of other proteins? A) tertiary protein B) chaperonin C) enzyme protein D) renaturing protein E) denaturing protein There are 20 different amino acids. What makes one ammo acid different from another? A) different side chains (R groups) attached to a carboxyl carbon B) different side chains (R groups) attached to the amino groups C) different side chains (R groups) attached to an a carbon D) different structural and optical isomers E) different asymmetric carbons The bonding of two amino acid molecules to form a larger molecule requires which of the following? A) removal of a water molecule B) addition of a water molecule C) formation of a glycosidic bond D) formation of a hydrogen bond E) both removal of a water molecule and formation of a hydrogen bond What aspects of protein structure are stabilized or assisted by hydrogen bonds? A) primary structure B) secondary structure C) tertiary structure D) quaternary structure E) secondary, tertiary, and quaternary structures, but not primary structure Which bonds are created during the formation of the primary structure of a protein? A) peptide bonds B) hydrogen bonds C) disulfide bonds D) phosphodiester bonds E) peptide bonds, hydrogen bonds, and disulfide bonds

Explanation / Answer

32-A) they are insoluble in water.

B is wrong because lipids made up of glycerol fatty acid and phosphate are one of the classes of lipids, all lipids are not made up of this composition.

C is wrong because lipid contain more energy than protein and carbohydrates.

D is wrong because dehydration reaction is for the lipid that contains fatty acid chains but not all lipid contains fatty acid chains

E is wrong because lipid do not contain nitrogen.

33-B) chaperonin

A is wrong because tertiary protein is one of the structures of protein.

C is wrong because enzyme proteins do not help them in folding.

D is wrong because renaturing protein helps to protein in renaturation of the structure.

E is wrong because denaturing protein will disrupt the structure of protein.

34-C) different side chains attached to an alpha carbon.

All other options are wrong because structure of amino acid has R group attached to the alpha carbon of the amino acid.

35-A) removal of a water molecule. Removal of water molecule will form peptide bond in amino acids.

B is wrong because addition of water molecule won't form a bind between two amino acids.

C is wrong because glycosidic bonds are present in DNA.

D is wrong because to hydrogen bonds do not hold the two amino acids.

E is wrong because B and D are wrong.

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