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Cell Membrane, Biological molecules, and Enzymes

Total questions: 40

Worksheet time: 30mins

Name
Class
Date
1.

Which of the following elements is NOT found in all organic molecules.

a)

Carbon

b)

Hydrogen

c)

Sulfur

d)

Oxygen

2.

Which of the following best describes the function of carbohydrates?

a)

Energy resource for cells

b)

Help speed up chemical reactions

c)

Transport of molecules in/out of the cell membrane

3.

Glucose is a

a)

Lipid

b)

Protein

c)

Simple sugar (monosaccharide)

d)

Complex sugar (polysaccharide)

4.

Which of the following is not a complex sugar (polysaccharide)?

a)

Cellulose

b)

Glycogen

c)

Ribose

d)

Starch

5.

The building blocks of proteins are called

a)

Amino acids

b)

Carbohydrates

c)

Fatty acids

d)

Riboses

6.

Which of the following is NOT a function of proteins

a)

Enzymes: speed up chemical reactions

b)

Energy: stored energy in cells

c)

Transport: movement of molecules into/out of cells

d)

Structure: provides shape to cells and tissues

7.

What cell process is best modeled by the diagram?

a)

osmosis

b)

exocytosis

c)

passive transport

d)

facilitated diffusion

8.

Which statement best describes how channel and carrier proteins in the plasma membrane are similar?

a)

Both allow for the flow of molecules into and out of a cell.

b)

Both directly connect the membrane to the nucleus of a cell.

c)

Both use energy to continuously move water molecules out of a cell.

d)

Both cause the phospholipid bilayer to form a rigid membrane for a cell.

9.

Which type of biological macromolecule is the main component of the plasma membrane?

a)

carbohydrate

b)

lipid

c)

protein

d)

nucleic acid

10.
What is NOT TRUE about the cell membrane?
a)
It controls what enters and leaves the cell
b)
Semipermeable
c)
Phospholipid bilayer
d)
Contains digestive enzymes
11.
A phospholipid has 2 parts. What are they called? 
a)
Hydrophilic Head, Hydrophobic Tail 
b)
Hydrophobic Head, Hydrophilic Tail 
12.

In a lipid bilayer, ___________ fatty acid tails face each other within the bilayer and form a region that excludes water.

a)

A. Hypotonic

b)

B. Hypertonic

c)

C. Hydrophilic

d)

D. Hydrophobic

13.
RNA and DNA are which type of organic compound?
a)
Lipids
b)
Carbohydrates
c)
Nucleic Acids
d)
Proteins
14.
Which of the following macromolecules are a prominent part of animal tissues that function in insulation, helping animals conserve heat?
a)
Carbohydrates
b)
Lipids
c)
Proteins
d)
Nucleic acids
15.
Some peeled pieces of apple were placed in distilled water and some in very salty water. The cells in the apple pieces will…
a)
Lose water in both solutions
b)
Gain water in both solutions
c)
Lose water in the distilled water and gain water in the salty water
d)
Gain water in the distilled water and lose water in the salty water
16.

In many enzyme reactions, the activity can be blocked if an inhibitor

a)

blocks the enzyme active site

b)

destroys the enzyme

c)

consumes all of the oxygen in the cell

d)

increases the activation energy

17.

Which of the following does NOT affect the activity of an enzyme?

a)

number of times it is used

b)

concentration of substrate

c)

salinity

d)

temperature

e)

pH

18.

Estrogen and testosterone are molecules that are in what group of biomolecules?

a)

nucleotides

b)

carbohydrates

c)

lipids

d)

nucleic acids

19.

Which most directly controls the rate at which food is broken down to release energy?

a)

vitamins

b)

nucleic acids

c)

hormones

d)

enzymes

20.

Amino acids are joined together to form proteins using

a)

peptide bonds

b)

ionic bonds

c)

disaccharide bonds

d)

hydrogen bonds

21.

The various enzymes in our bodies are

a)

nucleic acids

b)

carbohydrates

c)

nucleotides

d)

proteins

22.

A cell uses ATP to pump hydrogen ions (H+) across the inner membrane of its mitochondrion. This type of transport is most likely

a)

endocytosis

b)

facilitated diffusion

c)

osmosis

d)

active transport

23.
The picture is an example of...
a)
active transport
b)
passive transport
c)
diffusion
d)
osmosis
24.
What does a cell need to transport particles by active transport?
a)
Sun
b)
Wind
c)
Energy
d)
Channels
25.
What does the "fluid mosaic model" mean about the cell membrane?
a)
It can dissolve into fluid.
b)
The cell is mostly made of mosaic molecules.
c)
It looks like a flexible pattern made up of different parts.
d)
Somebody else should name these things.
26.
What is one major difference between passive and active transport?
a)
Passive transport uses energy; active transport does not.
b)
Both types of transport use energy.
c)
Active transport uses energy; passive transport does not.
d)
No difference. They are both the same.
27.

Proteins are one of four classes of biological macromolecules. Which of the following statements about proteins is not correct?

a)

Enzymes are specific types of proteins

b)

There are 20 amino acids that make up proteins

c)

All R chains on the amino acids that make up proteins are polar and acidic

d)

Peptide bonds form between amino acids in a dehydration reaction, creating proteins

28.

Which type of macromolecule is made up of Hydrogen (H), Carbon (C), Nitrogen (N) and Oxygen (O)

a)

A. Proteins

b)

B. Carbohydrates

c)

C. Nucleic Acids

d)

D. Lipids

29.

The specific location where the substrates bind to the enzyme is called the

a)

specific site

b)

appropriate site

c)

active site

d)

ignition site

30.
What is a valid conclusion based on the graph?
a)
Temperature influences an enzyme's activity rate.
b)
The maximum rate of human respiration occurs at about 57°C.
c)
Growth can be controlled by enzyme action.
d)
The maximum rate of human digestion occurs at about 45°C.
31.
How do non-competitive inhibitors affect enzymes?
a)
It binds to the active site, blocking the substrate
b)
It changes the shape of the enzyme
c)
It increases the activation energy
d)
It decreases the activation energy
32.
Lactose intolerance is most likely caused by -
a)
A lack of lactase enzyme to breakdown lactose
b)
Overproduction of glucose and galactose
c)
Excess lactase enzyme
d)
A lack of lactose sugar
33.

Molecules that bind to enzymes and enhance an enzyme's ability are called:

a)

CoFactors

b)

Competitive Inhibitors

c)

Allosteric Inhibitors

34.
Many coenzymes are
a)
metals
b)
vitamins
c)
proteins
d)
substances
35.
metal ions that bind to enzymes and enhance an enzyme's ability by attracting substrates are called:
a)
CoFactors
b)
CoEnzymes
c)
Allosteric Inhibitors
d)
Allosteric Activators
36.

Only a small amount of enzyme is needed for a large amount of substrate because _______

a)

Enzymes do not change at the end of a reaction and as such can be reused

b)

A small amount of enzyme can provide enough energy to continue the reaction

c)

More enzymes are formed while reaction takes place

d)

Enzymes act till completion of a reaction or not at all

37.

Which of the following are the properties of enzyme?

I        Enzymes are highly specific.
II       All enzymes are denatured at 60°c60\degree c  
III      A large number of enzymes is needed to react with large number of substrate.
IV       Enzymes lower the activation energy.

a)

I only.

b)

I and IV only.

c)

I, II and III 

d)

I, II and IV

38.

What happens to an enzyme when it is denatured?

a)

The activation energy is doubled

b)

The activation energy is lowered

c)

The optimal temperature for enzyme action is doubled

d)

The shape of the enzyme molecule is change

39.

Explain model shown above

a)

The active site is exactly complementary to substrate

b)

The active site is highly specific

c)

The active site is flexible

d)

The active site is rigid

40.

Which of the following would increase the rate of enzyme activity in the presence of a non-competitive inhibitor?

a)

add more substrate

b)

add more enzyme

c)

add more inhibitor

d)

reduce the temperature

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