Biology: The Chemical Basis of Life II: Organics Flashcards


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created 11 years ago by kathy_holleman
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Biology
Chapter 3
Biology 1406 Summer Dr. Kirk Test 2
updated 11 years ago by kathy_holleman
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1

Which of the following molecules is nonpolar?

C2H6

2

Two molecules with identical molecular formulas but that have different structures are called

isomers

3

Which of the following has identical molecular formulas but different structures and characteristics?

isotopes

4

Which of the molecules is polar and acts like a base?

R-NH2

5

Which functional group characterizes alcohols?

OH

6

Which functional group forms covalent bonds between peptide chains to stabilize the tertiary structure of proteins?

SH

7

Which of the followign is a polymer?

a protein

8

Which of the following is a polymer of glucose?

cellulose

9

A disaccharide, such as maltose, consists of two molecules of glucose linked by what type of bond?

glycosidic

10

Which of these is NOT a lipid?

cholesterol

11

Which of the following is NOT a property of a fat or fatty acid?

They are both soluble in water

12

The sequence of amino acids in a protein is its______structure.

primary

13

A protein _______ structure contains helixes and sheets that form from hydrogen bonding between carboxyl and amino groups of the polypeptide chain?

secondary

14

Acetic acid gives vinegar it sour taste. Which functional group is an acid?

-COOH

15

Which portion of an amino acid is unique between the 20 different amino acids?

the side chain or R-group

16

Which is true of the nucleotide base composition within the DNA double helix?

T+A=C+G

17

Which of the following statements BEST summarizes structural differences between DNA and RNA?

DNA contains a different sugar then RNA

18

An amino acid is to protein as a ______is to a nucleic acid.

nucleotide

19

Friedrich Wohler refuted the scientific concept of vitalism during the early 1800s by provig that organic molecules could be synthesized outside a living organism.

True

20

Macromolecules such as lipids and carbohydrates are produced from monomers through condensation reactions.

True

21

The sole function of carbohydrates is to serve as energy stores.

True

22

Saturated fats are composed of fatty acids with several double bonded carbons.

True

23

The primary structure of a protein ultmately determines its three-dimensional structure.

False

24

The four nucleotide bases found in DNA are identical to those in RNA.

False

25

Which of the following endings will tell you that a molecule is an enzyme?

-ase