Quiz: Organic Molecules

1. Many organic molecules are made of repeating units of individual molecules called __________.
a. monomers
b. polymers
c. carbon rings
2. Organic compounds, such as carbohydrates, lipids, proteins, and nucleic acids, within the human body are often referred to as __________.
a. complex molecules
b. macromolecules
c. polymers
3. Starch is made of numerous repeating units of glucose. All the glucose molecules are bonded together forming a large molecule of starch. Each individual glucose unit is called a __________.
a. monomer
b. polymer
c. polysaccharide
4. If a carbohydrate had this basic formula (CnH2nOn), the overall molecular formula would be (if n = 8) __________.
a. CH16O
b. CH2O
c. C8H16O8
5. If two organic molecules bond together forming a carbon to oxygen to carbon bond, they form an ester bond. If two organic molecules bond together forming a carbon to nitrogen to carbon bond, they form a peptide bond. What type of bond is formed when two carbohydrates bond together?
a. saccharide
b. peptide
c. ester
6. Which of the following is a dissacharide?
a. fructose
b. glucose
c. sucrose
7. Which of the following is the stored form of a polysaccharide in humans in liver and muscle cells?
a. glucose
b. starch
c. glycogen
8. Which of the following consists of at least one double bond between two carbon atoms?
a. triglycerides
b. saturated fatty acids
c. unsaturated fatty acids
9. All fatty acids have a __________ group at the end of the molecule nearest the glycerol molecule to which it is bonded.
a. covalent
b. carboxyl
c. saturated
10. A saturated fatty acid has maximum number of __________ atoms in its chain.
a. oxygen
b. hydrogen
c. carbon
11. Phospholipids and triglycerides have a commonality between them. Which of the following is one of the commonalities?
a. both have fatty acids bonded to a glycerol molecule
b. both have saturated fatty acid chains
c. both have a double bond between two carbon atoms within the fatty acid chains
12. A molecule of fat has __________ fatty acid chains and a phospholipid has __________ fatty acid chains.
a. 2; 3
b. 3; 2
c. 3; 3
13. Cholesterol is a __________ molecule.
a. protein
b. steroid
c. carbohydrate
14. Which of the following is a characteristic of all lipids?
a. fatty acid chains
b. nitrogen
c. insoluble in water
15. Which of the following describes the main structural backbone characteristic of all steroids?
a. 4 six-carbon rings
b. 3 six-carbon rings and 1 five-carbon ring
c. four rings bonded to fatty acids
16. All proteins are made of repeating units of __________.
a. glucose
b. amino acids
c. nitrogen
17. The amino acids in a protein are bonded together, and the glucose units in a carbohydrate are bonded together. What kind of bonds do proteins and carbohydrates have?
a. hydrogen
b. covalent
c. ionic
18. Amino acids are bonded together in different sequences to create thousands of different proteins in the body. How many different amino acids are used to create the hundreds of thousands of protein molecules manufactured in the body?
a. twenty
b. hundreds
c. thousands
19. Which of the following do all amino acids have in common?
a. a sulfur atom
b. the same “R” group
c. an amine group and a carboxyl group
20. Which of the following is not a part of the nucleotides that make up DNA?
a. nitrogenous base
b. sugar unit
c. amino group
21. Adenine, for example, is the __________ of a DNA molecule.
a. nitrogen base
b. polymer
c. sugar
22. What type of bond is formed between adenine and thymine and between cytosine and guanine?
a. ionic
b. hydrogen
c. covalent
23. What is the name of the sugar molecule that makes up DNA?
a. ribose
b. deoxyribose
c. uracil
24. RNA consists of __________ instead of __________.
a. uracil; thymine
b. adenine; thymine
c. guanine; cytosine

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