Unit 1 Test 2

13.A major type of lipid found in cell membranes is a. Triglycerides b. Phospholipids c. Glycerol d. waxes

b

14. Glucose molecules are to starch as ______ are to proteins a. Oils b. Amino acids c. Fatty acids d. Monosaccharides

b

17. Which of the following options correctly pairs a polymer and its monomer? a. Cellulose, amino acids b. DNA, nucleotides, c. Collagen, nucleic acids d. RNA, ribose

b

21. Below is a molecule of caffeine. Which of the following features are not present in a molecule of caffeine? a. A carbonyl group b. A carboxyl group c. A methyl group d. One or more double bonds

b

22. How are these two amino acids attached together? Dehydration ⇒⇒⇒⇒ ↘H2O a. Amino group to amino group through hydrolysis b. Amino group to carboxylic acid group through dehydration synthesis c. Carboxylic acid group to carboxylic acid group through dehydration synthesis d. Through a hydrolysis reaction

b

4. Which of the following is an amino group? a. -OH b. -NH2 c. -COOH d. -CO

b

7. The results of dehydration synthesis can be reversed by a. Condensation by removing water b. Hydrolysis by adding water c. Polymerization by creating large molecules d. The addition of an amino group

b

8. Many names for sugars end in the suffix a. -acid b. -ose c. -hyde d. -ase

b

A single Yummie cake contains 4.5 grams of total fat, 27 grams of complex carbohydrate, 0 grams of fiber, and one gram of protein. 24. After eating a Yummie cake, what molecule do you expect to be most abundant in your digestive system? a. Amino acids b. Monosaccharides c. Cellulose d. triglycerides

b

1.A solution with a pH of 7 is a. Strongly acidic b. Weakly acidic c. Neutral d. Weakly basic

c

10. Fatty acids are a. Composed of carbon, hydrogen, oxygen,and phosphate in a 1:2:1:2 b. Composed of carbon, hydrogen, glycerol, and a phosphate group c. Hydrophobic d. Composed of four linked rings

c

2. Organic compounds a. Always contain nitrogen b. Are synthesized only by animal cells c.Always contain carbon d. Always contain oxygen

c

11. Which of the following statements regarding triglyceride molecules is false? a. Triglycerides consist of three fatty acids attached to a glycerol molecule b. Triglycerides play a role in energy storage c. Triglycerides are a type of fat d. Triglycerides are hydrophilic

d

18. You work for the company that manufactures food products. A new ¨wonder food¨ is being distributed by a rival company. The researchers in your company determine that the ¨wonder food¨ contains only carbon, oxygen, and hydrogen. At this point, your researchers can say with certainty that the food... a. Is only made of proteins. b. Could only be made of triglycerides. c. Could only be made of carbohydrates. d. Does not include proteins or nucleic acids.

d

20. What is the matching or complementary strand sequence to the DNA strand TCGATGG? A) TCGATGG B) GGTAGCT C) AGUACC D) AGCTACC

d

3. Which of the following is a carboxyl group? a. -C-O b. -OH c. -NH2 d.-COOH

d

5. Which of the following statements about the monomers and polymers found in living organisms is false? a. Cells typically make all of their macromolecules from a set of 40-50 common monomers and a few other ingredients that are rare. b. The monomers used to make polymers are essentially universal c. Monomers serve as building blocks for polymers d. Monomers are joined together by the process of hydrolysis

d

6. Which of the following statements about dehydration synthesis is false? a. One monomer loses a hydrogen atom, and the other loses a hydroxyl group b. H2O is formed as the monomers are joined c. Covalent bonds are formed between the monomers d. Animal digestive systems utilize this process to break down food and large macromolecules

d

12. Fatty acids with double carbons are said to be a. Unsaturated b. Saturated c. Completely hydrogenated d. monoglycerides

a

16. Which of the following regarding nucleotides is false? a. Nucleotides contain lipids b. Nucleotides contain sugar molecules c. Nucleotides can be linked together to form nucleic acids d. Nucleotides contain nitrogenous bases

a

19. You identify a molecule in a pizza that is a polymer: has oxygen, hydrogen, carbon, and nitrogen atoms and is hydrophilic. What kind of molecule is it? a. Protein b. Carbohydrate c. Nucleic acid d. lipid

a

23. Below are the structures of 3 fatty acids, palmitic acid, stearic acid, and oleic acid. What combination of these fatty acids could you use to make a fat that is liquid at room temperature a. One palmitic acid, one stearic acid, and one oleic acid b. Three palmitic acids c. Two palmitic acids and one stearic group d.One stearic acid, one oleic acid, and one phosphate group

a

9. A disaccharide forms when a. Two monosaccharides join by dehydration synthesis b. Two starches join by dehydration synthesis c. Two monosaccharides join by hydrolysis d. Two starches join by hydrolysis

a

A single Yummie cake contains 4.5 grams of total fat, 27 grams of complex carbohydrate, 0 grams of fiber, and one gram of protein. 25. After eating a Yummie cake, which of the following metabolic processes is likely occurring at the fastest rate? a. Hydrolysis of complex carbohydrates b. Dehydration synthesis involving glucose c. Dehydration synthesis involving fatty acids d. Hydrolysis of nucleic acids

a