8) Which molecule(s) shown contain(s) a carbonyl functional group? A) A B) A and

Question

8) Which molecule(s) shown contain(s) a carbonyl functional group? A) A B) A and B C) A and C D)D 9) Which of the following is not a true polymer? A) starch B) RNA C) DNA D) fat 10) Which of the following statements concerning dehydration reactions and hydrolysis is correct? A) Dehydration reactions allow solutions to evaporate; hydrolysis reactions dissolve solutes B) Dehydration reactions and hydrolysis reactions assemble polymers from monomers C) Hydrolysis reactions create polymers from monomers, and dehydration reactions create monomen from polymers D) Dehydration reactions create polymers from monomers, hydrolysis reactions break downpolymers 11) People who are lactose intolerant cannot extract energy from milk because A) they are missing the enzyme that hydrolyzes lactose B) lactose is too big to be digested by the enzymes C) milk is fermented to a by-product, which cannot be digested D) they are missing the bacteria that can digest lactose 12) Humans can digest starch but not cellulose humans have enzymes that can hydrolyze the a-glycosidic linkages of starch but not the B-glycosidic linkages of cellulose B) starch monomers are joined by covalent bonds, and cellulose monomers are joined by ionicbonds C) the monomer of starch is glucose, while the monomer of cellulose is galactose D) Starch is softer than cellulose 13) Which of the following statements is not true for lipids? A) Lipids are not true polymers B) Waxes and certain pigments are lipids. C) Lipids are a diverse group that are hydrophobic. D) Lipids are a diverse group that are hydrophilic. 14) Saturated fats A) are more common in plants than in animals B) have multiple double bonds in the carbon chains of their fatty acids C) are generally liquid at room temperature D) contain more hydrogen than unsaturated fats that consist of the same number of carbon atoms

Explanation / Answer

Answers:-

9:- D) Fat

Explanation:- lipids ( fats and oils) are formed by triacylgycerol composed of glycerol and 3 fatty acids. So lipids are not made up of monomers so it is not a true polymer.

10:- D) dehydration reactions create polymers from monomers; hydrolysis reaction break down polymers.

Explanation:- Dehydration reaction :- monomers combine via covalent bonds to form larger polymers by releasing water molecule as byproduct.

Hydrolysis:- In this reaction polymers are broken into monomers by using water molecules during breakdown.

11:- A) They are missing the enzyme that hydrolyzed lactose.

Explanation:- People with lactose intolerance cannot produce enough lactase enzyme for the breakdown of lactose. That's why they cannot easily digest the the milk and milk products.

12:- A) humans have enzymes that can hydrolysis the alpha-glycosidic linkages of starch but not the beta-glycosidic linkages of cellulose.

Explanation:- Starch contains alpha-linked glucose while cellulose have beta-linked glucose and humans lack the enzymes for the hydrolysis of the cellolose beta-glycosidic linkages.

13:- D) Lipids have a diverse group that are hydrophilic.

Explanation:- lipids are non-polar molecules which are insoluble to water so they are hydrophobic not hydrophilic.

14:- D) Contain more hydrogen than unsaturated fats that consist of the same number of carbon atoms .

Explanation:- because saturated fats have single bonds b/w C-C atoms while unsaturated fats have double or triple bonds. So they have less hydrogen atoms than saturated fats.

Related Questions

Navigate

• Browse (All)
• Browse 8
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.