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WorksheetsEnzymes and Cell Membrane Review
Total questions: 60
Worksheet time: 30mins
Name
Class
Date
1.
Most enzymes:
a)
speed up the chemical reaction
b)
have no effect on the rate of the chemical reaction
c)
slow the rate of the chemical reaction
d)
keep the rate of the chemical reaction the same
2.
What is a substance called if it speeds up a chemical reaction?
a)
reusable
b)
catalyst
c)
specific
d)
fragile
3.
With what 3 letters do enzymes typically end?
a)
-ose
b)
-ase
c)
-ese
d)
-tic
4.
The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?
a)
Enzymes increase the energy of the reactants.
b)
Enzymes decrease the energy level of the products.
c)
Enzyme decrease the activation energy of the reaction.
d)
Enzymes reverse the direction of the reaction.
5.
Which of the following conclusions can be drawn from this graph?
a)
The optimum pH of the enzyme is 6.6.
b)
The optimum pH of the enzyme is 5.8
c)
The enzyme’s activity increases as pH increases 5.0 to 9.0
d)
The enzyme’s activity is greater around pH of 8.0 .
6.
What happens when enzymes are heated to a high temperature?
a)
The enzymes die.
b)
The shapes of the enzyme are altered denature
c)
The enzymes' amino acid sequence changes.
d)
The enzymes remain the same
7.
How do enzymes speed up chemical reaction?
a)
Increasing activation energy
b)
Decreasing activation energy
c)
Increasing deactivation energy
d)
Decreasing deactivation energy
8.
Cells can produce over one thousand different enzymes at a time. Enzymes are critical to the metabolism of these cells, but why are so many different enzymes needed?
a)
Cells are completely unable to control what enzymes
they produce
they produce
b)
The variety of enzymes prevents their actions from being inhibited.
c)
The active site of an enzyme can only bind to a specific substrate.
d)
The products of a reaction are always converted into new enzymes.
9.
Why does enzyme activity decrease when it is in solution that has either a too high or too low pH?
a)
All enzymes only work in neutral solutions
b)
Enzyme activity remains unchanged in different pH's
c)
The shape of the active site changes
d)
The shape of the substrate changes
10.
What happens when an enzyme changes shape?
a)
The reaction speeds up
b)
The reaction slows down
c)
The enzyme dies
d)
The enzyme has to change back its shape to work
11.
What is it called when an enzyme's shape is changed?
a)
Destroy
b)
Denature
c)
Delete
d)
Demolish
12.
This is the most important factor about an enzyme that determines what job it will do in the body.
a)
The sugars that make up the enzyme
b)
The nucleic acids that make up the protein
c)
The shape of the enzyme
d)
The fatty acids that make up the protein
13.
What would happen to the rate of reaction if more substrate added to the solution at point C
a)
increase reaction rate
b)
decrease reaction rate
c)
no change in reaction rate
14.
Movement of particles from high to low concentration.
a)
Passive Transport
b)
Active Transport
15.
Osmosis is a form of ______________.
a)
Passive Transport
b)
Active Transport
16.
Endocytosis
a)
Passive Transport
b)
Active Transport
17.
Solutes move against the concentration gradient, therefore energy is needed.
a)
Passive Transport
b)
Active Transport
18.
What is it called when molecules move across the cell membrane from an area of high concentration to an area of low concentration through a carrier protein?
a)
Diffusion
b)
Osmosis
c)
Active Transport
d)
Facilitated Diffusion
19.
The cell membrane is selectively permeable, which means...
a)
All materials can enter and leave the cell
b)
Certain things can enter while others cannot
c)
The cell manually sorts through all materials
d)
Only certain cells can interact with the cell.
20.
What is the difference between active and passive transport?
a)
Active does not need energy and passive uses ATP (energy)
b)
Active uses ATP (energy) and passive does not need energy
c)
Active stores transport proteins and passive releases
d)
Active uses hormones and passive does not
21.
Against the concentration gradient
low to high
uses energy/ATP
low to high
uses energy/ATP
a)
facilitated diffusion
b)
osmosis
c)
active transport
d)
simple diffusion
22.
This picture represents what type of cell transport?
a)
endocytosis
b)
exocytosis
c)
osmosis
d)
passive transport
23.
A cell will _____________________ in a hypertonic solution.
a)
swell
b)
shrink
c)
will not change
d)
will explode
24.
A cell will __________________ in a hypotonic solution.
a)
swell and perhaps burst (lyse)
b)
shrink
c)
the size of the cell will not change
d)
the size of the cell will change from large to small and from small to large
25.
Active transport requires ______, moves materials from __________________, and goes _______ the concentration gradient.
a)
No energy, low to high, against
b)
ATP, high to low, with
c)
ATP, low to high, with
d)
ATP, low to high, against
26.
Osmosis is the movement of _____ across a membrane.
a)
food
b)
energy
c)
oxygen
d)
water
27.
During osmosis
a)
water moves from high to low concentration
b)
large or oddly shaped molecules move across a cell membrane
c)
water moves when energy is used
d)
proteins are built
28.
In the given scenario what will happen? An egg is placed in pure water for 48 hours.
a)
The egg will gain water and swell.
b)
Water will move in and out of the cell equally, and the cell with neither shrink nor swell.
c)
The egg will lose water and shrink.
29.
Where will the water go?
a)
Into the cell
b)
Out of the cell
c)
Equally in & out - it's isotonic
d)
There is no water
30.
A blood cell is placed into the jar, as seen. Where will the water go?
a)
Into the cell
b)
Out of the cell
c)
Equally in & out - it's isotonic
d)
The water is a lie
31.
Which of the following is NOT part of the cell membrane?
a)
Lipids
b)
Carbohydrates
c)
Proteins
d)
Nucleic Acids
32.
Which of the following is responsible for getting complex molecules across the cell membrane?
a)
Lipids
b)
Carbohyrates
c)
Proteins
d)
Nucleic Acids
33.
What are the carbohydrates in the cell membrane for?
a)
to form channels and pumps
b)
to help cells identify one another
c)
to make the membrane strong
34.
What forms the channels and pumps in the phospholipid bilayer?
a)
carbohydrates
b)
proteins
c)
hydrophilic heads
d)
lipids
35.
___________ strengthens and stabilizes the cell membrane.
a)
Carbohydrates
b)
Proteins
c)
Phospholipids
d)
Cholesterol
36.
___________ have 2 functions in the cell membrane.
1.) They act like gatekeepers, only let certain things in.
2.) Enzyme receptors embedded in the membrane.
1.) They act like gatekeepers, only let certain things in.
2.) Enzyme receptors embedded in the membrane.
a)
Carbohydrates
b)
Proteins
c)
Phospholipids
d)
Cholesterol
37.
Which type of Passive Transport is being represented in this picture?
a)
Passive Diffusion
b)
Simple Diffusion
c)
Active Diffusion
d)
Facilitated Diffusion
38.
What type of solution is this cell in?
a)
Isotonic
b)
Hypertonic
c)
Hypotonic
d)
diffused
39.
What type of solution is this cell in?
a)
Isotonic
b)
Hypertonic
c)
Hypotonic
d)
diffused
40.
What type of solution is this cell in?
a)
Isotonic
b)
Hypertonic
c)
Hypotonic
d)
diffused
41.
What type of transport is seen in this picture?
a)
Passive Transport
b)
Active Transport
42.
Movement of materials from high to low concentration through a protein channel.
a)
Passive Transport
b)
Active Transport
43.
This picture represents which type of cellular transport?
a)
passive transport
b)
endocytosis
c)
exocytosis
d)
osmosis
44.
What does "bilayer" mean?
a)
one layer
b)
two layers
c)
laminated
d)
bilateral
45.
Describes the arrangement of the cell membrane as bendable and made of many parts.
a)
The Fluid Mosaic Model
b)
The Major Mobility Model
c)
The Crazy Cell Model
d)
The Maze Model
46.
___________ allow cells to recognize each other and act like ID tags.
a)
Carbohydrates
b)
Proteins
c)
Phospholipids
d)
Cholesterol
47.
___________ strengthens and stabilizes the cell membrane.
a)
Carbohydrates
b)
Proteins
c)
Phospholipids
d)
Cholesterol
48.
___________ form the two layers of the cell membrane.
a)
Carbohydrates
b)
Proteins
c)
Phospholipids
d)
Cholesterol
49.
Something is ___________ ____________
when some molecules can cross the membrane while others cannot.
when some molecules can cross the membrane while others cannot.
a)
Selectively (or Semi) Permeable
b)
Totally Transparent
c)
Liquid Licorice
d)
Heavily Patrolled
50.
In a nerve cell, ATP energy is used to pump sodium (Na) out of the cell and potassium (K) into the cell. This is an example of...
a)
Facilitated Diffusion
b)
Simple Diffusion
c)
Active Transport
d)
Osmosis
51.
What type of macromolecule are enzymes?
a)
Protein
b)
Carbohydrate
c)
Lipid
d)
Nucleic Acid
52.
Letter D...
a)
active site
b)
enzyme
c)
substrate
d)
products
53.
Letter B...
a)
active site
b)
enzyme
c)
substrate
d)
products
54.
Letter C...
a)
active site
b)
enzymes
c)
substrate
d)
products
55.
Letter E...
a)
active site
b)
enzyme
c)
substrate
d)
products
56.
Which of the following two factors affect an enzyme's operation the most?
a)
amount of light and temperature
b)
blood glucose and pH
c)
temperature and pH
d)
amount of light and pressure
57.
What substances are formed as a result of this reaction?
a)
hydrogen peroxide and water
b)
water and oxygen
c)
hydrogen peroxide and oxygen
d)
water and ozone
58.
What is the optimum pH for the enzyme salivary amylase?
a)
2
b)
5
c)
6.2
d)
9.1
59.
In the lock-and-key model of enzyme action, the __________ fits into the __________ of the enzyme.
a)
product; substrate
b)
active site; product
c)
substrate; active site
d)
active site; substrate
60.
The _______________________ model helps illustrate how each enzyme only works on one specific substrate.
a)
enzyme-substrate
b)
bits and pieces
c)
lock-and-key
d)
matter and energy
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