Deck 3: Chemistry of Life

Question 1

Many plant pigments can be used as colorimetric tests for changes in ________.

A)temperature
B)carbohydrate concentration
C)pH
D)water purity
E)sodium ion (Na+)concentration

Answer 1

C

Question 2

The building blocks of many lipids include

A)amino acids.
B)monosaccharides.
C)polypeptides.
D)fatty acids and glycerol.
E)polysaccharides.

Answer 2

D

Question 3

All of the following are true about the cabbage water tests, except

A)red cabbage contains a pigment that functions as a colorimetric pH indicator.
B)distilled water is used in this experiment as an example of a neutral substance.
C)vinegar is added to one of the test tubes as an example of an acidic substance.
D)baking soda is used in this experiment as an example of a basic substance.
E)All of the choices are correct.

Answer 3

E

Question 4

A solution that has a high concentration of hydroxide (OH-)ions

A)has a low pH.
B)has a high concentration of hydrogen (H+)ions too.
C)is a basic (alkaline)solution.
D)is a neutral solution.
E)is an acidic solution.

Question 5

Acids have a pH of <7.0, and they contain a higher concentration of H+ ions than OH- ions.

Question 6

In the iodine (IKI)test, a blue-black color indicates that

A)proteins have been broken down.
B)starch has not been broken down.
C)lipids have not been broken down.
D)starch has been broken down.
E)proteins have not been broken down.

Question 7

Although the pH of the blood is 7.4, our cells can function well within a pH range of 3.0-11.0.

Question 8

Human blood has a pH of 7.4; therefore, it can be classified as a ________.

A)weak acid
B)strong base
C)strong acid
D)neutral solution
E)weak base

Question 9

In Benedict's test, the greatest amount of sugar is indicated by a ________ color.

A)blue
B)yellow
C)green
D)brown
E)red

Question 10

Carbohydrates, lipids, and proteins are all classified as organic molecules.

Question 11

The smallest unit of any element is a(n)________.

A)molecule
B)compound
C)macromolecule
D)atom
E)electron

Question 12

Sudan IV dye is a test for proteins.

Question 13

There is a ________ difference between a pH of 5 and a pH of 6.

A)10x
B)2x
C)5x
D)100x
E)50x

Question 14

All of the following are true of lipids, except

A)amino acids are a type of lipid.
B)some lipids are used for cellular structure.
C)triglycerides are also called fats.
D)lipids provide some cellular energy.
E)phospholipids are a type of lipid.

Question 15

If Biuret reagent is added to a solution, and it reacts to produce a pink to purple color, this indicates the presence of ________ in the solution.

A)lipids
B)glucose
C)protein
D)cholesterol
E)starch