Quiz about Biochemistry Review

Question 1

Which elements are present in all organic compounds?

Accepted Answer

Carbon (C) & Hydrogen (H)

Answer

Oxygen (O) & Nitrogen (N)

Answer

Sulfur (S) & Phosphorus (P)

Answer

Helium (He) & Neon (Ne)

Question 2

Which four elements make up over 96% of all living things?

Accepted Answer

Hydrogen (H), Oxygen (O), Nitrogen (N), and Carbon (C)

Answer

Helium (He), Neon (Ne), Argon (Ar), and Krypton (Kr)

Answer

Sodium (Na), Magnesium (Mg), Aluminum (Al), and Silicon (Si)

Answer

Iron (Fe), Copper (Cu), Zinc (Zn), and Lead (Pb)

Question 3

Which subatomic particles are involved in chemical bonds?

Accepted Answer

Electrons

Answer

Protons

Answer

Neutrons

Answer

Quarks

Question 4

What are the characteristics of water that make it important to life?

Accepted Answer

Water is polar, which makes it highly cohesive and adhesive. Water is a universal solvent.

Answer

Water is non-polar and does not dissolve substances easily.

Answer

Water has a low specific heat capacity, making it easy to change temperature.

Answer

Water is a poor conductor of electricity.

Question 5

What is pH?

Accepted Answer

A measurement of the acidity of a solution

Answer

A type of chemical bond

Answer

A unit of temperature

Answer

A measure of electrical resistance

Question 6

Which pH values are acidic?

Accepted Answer

1-6

Answer

7

Answer

8-14

Question 7

Identify whether each solution is acidic.

Accepted Answer

Vinegar

Accepted Answer

Stomach

Acid

Answer

Water

Answer

Glass Cleaner

Question 8

Which substance plays a major role in most of the chemical reactions that occur in a living cell?

Accepted Answer

Water

Answer

Glycerol

Answer

Glycogen

Answer

Maltose

Question 9

Pick the term that best fits each statement. Starch, fats, DNA, and enzymes are

Accepted Answer

Complex, organic molecules, made from smaller organic molecules.

Answer

Simple, inorganic molecules, made from smaller inorganic molecules.

Question 10

Most organisms contain

Accepted Answer

Both organic and inorganic compounds

Answer

Organic compounds, only

Answer

Inorganic compounds, only

Answer

Neither organic nor inorganic compounds

Question 11

Where is energy stored in an organic molecule?

Accepted Answer

In the chemical bonds

Answer

In the nucleus

Answer

In the electrons

Answer

In the protons

Question 12

What happens to certain nutrient molecules after they pass into muscle cells?

Accepted Answer

They are acted on by enzymes and release the energy they contain.

Answer

They are replicated in the nucleus.

Answer

They are changed into tissues and organs in the cytoplasm.

Answer

They enter chloroplasts, where they can absorb light energy.

Question 13

Use the diagram to answer the following question: Which molecule is an example of a lipid?

Accepted Answer

A

Answer

B

Answer

C

Question 14

Use the diagram to answer the following question: Which molecule is an example of a disaccharide?

Accepted Answer

B

Answer

A

Answer

C

Question 15

Use the diagram to answer the following question: Which molecule could be glucose?

Accepted Answer

C

Answer

A

Answer

B

Question 16

Which element is found in nucleic acids and proteins, but not in carbohydrates or lipids?

Accepted Answer

Nitrogen

Answer

Carbon

Answer

Oxygen

Answer

Hydrogen

Question 17

Check the box next to each characteristic that describes an enzyme.

Accepted Answer

Reusable; remains unchanged

Accepted Answer

Speeds up chemical reactions

Accepted Answer

Only works with a specific substrate

Accepted Answer

Organic catalyst

Accepted Answer

Activity depends on pH & temperature

Question 18

What does X most likely represent?

Accepted Answer

Enzyme

Answer

Carbohydrate

Answer

Water

Answer

Fire

Question 19

Identify the REACTANTS in the chemical reaction.

Accepted Answer

CO2 + H2O

Answer

X

Answer

C6H12O6 + O2

Question 20

Identify the PRODUCTS in the chemical reaction.

Accepted Answer

Products

Answer

Reactants

Answer

Catalysts

Answer

Inhibitors

Question 21

Which chemical reaction is represented by the diagram below?

Accepted Answer

digestion of a disaccharide

Answer

synthesis of a dipeptide

Answer

synthesis of a lipid

Answer

digestion of a polypeptide

Question 22

Enzyme molecules normally interact with substrate molecules. Some medicines work by blocking enzyme activity in pathogens. These medicines are effective because they

Accepted Answer

have a shape that fits into the enzyme

Answer

are the same size as the enzyme

Answer

are the same size as the substrate molecules

Answer

have a shape that fits into all cell receptors

Question 23

Why are enzymes required for all metabolic reactions? Chemical reactions required to maintain homeostasis would occur too slowly.

Accepted Answer

Enzymes speed up chemical reactions.

Answer

Enzymes slow down chemical reactions.

Answer

Enzymes have no effect on chemical reactions.

Answer

Enzymes are not required for metabolic reactions.

Question 24

A solution with a pH of 6 contains enzyme C and its substrate. How would the rate of action of enzyme C be affected if a base is gradually added to this solution? As the base is added, the pH of the solution will gradually increase. The activity of enzyme C will increase until the solution reaches a pH of 9, then the activity of enzyme C would decrease.

Accepted Answer

The activity of enzyme C will increase until the solution reaches a pH of 9, then decrease.

Answer

The activity of enzyme C will decrease as the pH increases.

Answer

The activity of enzyme C will remain constant regardless of pH changes.

Answer

The activity of enzyme C will increase indefinitely as the pH increases.

Question 25

Which enzyme is most likely to be found in a human stomach?

Accepted Answer

Pepsin

Answer

Enzyme A

Answer

Amylase

Answer

Lipase

Question 26

Since salivary enzymes normally operate best at a pH close to neutral, the optimum pH range for the hydrolysis of carbohydrates in the human mouth would be

Accepted Answer

6 - 8

Answer

3 - 5

Answer

4 - 6

Answer

8 - 10

Question 27

Check the box next to each factor that would INCREASE the rate of starch digestion.

Accepted Answer

Add more starch to the solution

Accepted Answer

Add amylase to the solution

Answer

Decrease the temperature of the solution

Answer

Add more glucose to the solution

Answer

Increase the volume of the container

Question 28

Using your knowledge of enzyme structure and function, explain why a prolonged period of high fever is dangerous to humans.

Accepted Answer

High fever can denature enzymes, disrupting their function.

Answer

High fever increases enzyme activity, improving bodily functions.

Answer

High fever has no effect on enzyme structure or function.

Answer

High fever enhances enzyme stability, making them more efficient.

Question 29

Antibody molecules and enzymes are similar in that they both

Accepted Answer

Have a specific shape related to their specific function

Answer

Control transport through the cell membrane

Answer

Remove wastes from the body

Answer

Speed up chemical reactions in cells

Question 30

Which number indicates the enzyme-substrate complex?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 31

What would likely happen if the shape of the active site on molecule C changed?

Accepted Answer

The synthesis of molecule D would occur slower or not at all

Answer

The synthesis of molecule A would occur slower or not at all

Answer

The digestion of molecule D would occur faster

Answer

The digestion of molecule B would occur faster

Question 32

"not full"

Accepted Answer

unsaturated

Answer

saturated

Answer

supersaturated

Answer

aqueous

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