Exam Please indicate your answer on the provided SKANTRON 1) How many molecules

Question

Exam Please indicate your answer on the provided SKANTRON 1) How many molecules of water are needed to completely hydrolyze a polymer that is 11 1) monomers long? A) 11 B) 8 ) 10 2) All of the following contain amino acids except D) 9 E) 12 2) A) insulin. B) hemoglobin. C) cholesterol. D) antibodies. E) enzymes. 3) A covalent chemical bond is one in which 3) A) outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electrorn shells of both atoms. B) ou ter-shell electrons of one atom are transferred to fill the inner electron shell of another atom. C) protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms D) an electron occupies a hybrid orbital located between the nuclei of two atoms. E) electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged. 4) On food packages, to what does the term insoluble fiber refer? 4) A) polypeptides B) amylopectin C) chitin D) cellulose E) starch 5) The molecular formula for glucose is Colt120% What would be the molecular formula for a 5) polymer made by linking ten glucose molecules together by dehydration reactions? A) C6oH120060 B) C6oH111051 C) C6oH102051 D) C6H1206 6) Humans can digest starch but not cellulose because 6) A) humans harbor starch-digesting bacteria in the digestive tract B) humans have enzymes that can hydrolyze the alpha (a) glycosidic linkages of starch but not the beta () glycosidic linkages of cellulose. C) humans have enzymes that can hydrolyze the beta (B) glycosidic linkages of starch but not the alpha (a) glycosidic linkages of cellulose. D) the monomer of starch is glucose, while the monomer of cellulose is galactose E) the monomer of starch is glucose, while the monomer of cellulose is maltose.

Explanation / Answer

1. To hydrolyze a polymer means to break peptide bonds. So a 11 chain monomer will have 10 peptide bonds. Therefore 10 H2O molecules. Option C

2. Cholesterol doesn't contain amino acids. Option C

3. Definition of Covalent bond : A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms. Option A

4. Human body cannot digest cellulose and hence it is known as insoluble fiber. Option D

5. 10 ( C6H12O6) = C60H120O60. As expalined before 10 monomers will have 9 bonds. Therefore 9 molecules of H2O will be removed. C60H120O60 - H18O9 = C60H102O51. Option C

6. Human body lack enzymes to break beta glycosidic linkage of cellulose. Option B

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