The reaction shown here generated a: A) Ionic Bond B) Peptide Bond C) Glyosidic

Question

The reaction shown here generated a: A) Ionic Bond B) Peptide Bond C) Glyosidic Bond D) Ester Linkage E) Phosphodiester bond What is meant by 'hydrolysis' with regards to macromolecules? A) There is an OH at the 2' position of a sugar B) A substance binds to water C) A substance dissolves in water D) When water is added to a bond it cleaves the bond adding the water. E) Water is a polar substance If you remove all the functional groups from an organic molecule you are left with: A) Carbon B) Carbohydrate C) Hydrocarbon D) Amide E) None of the above All of the following are true of protein denaturation except that it A) Is a shape change B) Is always irreversible C) Can be caused by a pH change D) Can be caused by temperature E) All the above are true Animals store glucose in the form of A) Starch B) Glycerol C) Glycogen D) Amylose E) Protein In a DNA molecule, what holds together nitrogenous bases from the two chains? A) Covalent B) Van der Waals Forces C) Hydrogen bonds D) Ionic bonds E) All the above

Explanation / Answer

Answer:

17. (B) Peptide bond

Explanation:

A peptide bond is a chemical bond that joins two amino acids. Carboxyl group of one molecule reacts with amide group of the other releasing a water molecule.

18. (D) When water is added to a bond, it cleaves the bond adding the water

Explanation:

Hydrolysis is the cleavage of a molecule due to reaction with water.

19. (C) Hydrocarbon

Explanation:

When an organic molecule is left with only carbon and hydrogen, it is a hydrocarbon.

20. (B) is always irreversible

Explanation:

Denaturation is a shape change that can be caused by changes in pH, temperature, or ion concentration in it's environment. Some denaturation is reversible.

21. (C) Glycogen

In animals such as human, carbohydrates are stored in the form of glycogen mainly in the liver and muscle cells.

22. (C) Hydrogen bonds

Explanation:

Nitrogenous bases in DNA duplex are held together by hydrogen bonds, two between A & T while three between C & G

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