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Worksheetscells, enzymes, homeostasis unit 8 test review
Total questions: 77
Worksheet time: 3hrs 41mins
Name
Class
Date
1.
In what organelle is the genetic material found inside?
a)
Endoplasmic Reticulum
b)
Golgi Complex
c)
Nuclear Membrane
d)
Nucleus
2.
What organelle is called the "powerhouse" of a cell?
a)
Endoplasmic Reticulum
b)
Nucleus
c)
Mitochondria
d)
Nucleolus
3.
Using this image, what organelle is C?
a)
Cell Wall
b)
Mitochondria
c)
Large Cell Vacuole
d)
Chloroplast
4.
What is the function of the mitochondria?
a)
Structure that manufactures ribosomes
b)
Structures that converts nutrients to energy
c)
Stack of membranes that packages chemicals
d)
Structure that contains DNA and directs the cell
5.
What is the function of the vacuole?
a)
Sac that stores water, nutrients, and waste products
b)
Sac filled with digestive chemicals
c)
Jelly-like substance within the plasma membrane
d)
stack of membranes that packages chemicals
6.
What is the function of nucleus?
a)
Structure that organizes motion of chromosomes.
b)
Structure that contains DNA and directs the cell
c)
Membrane that surrounds and protects the cell
d)
Stack of membranes that packages chemicals
7.
Where does photosynthesis occur?
a)
mitochondria
b)
stomata
c)
xylem
d)
chloroplast
8.
I store water in both plant and animal cells. What am I?
a)
cytoplasm
b)
ribosomes
c)
vacuole
d)
lysosomes
9.
I make proteins for the cell. What am I?
a)
ribosome
b)
mitochondria
c)
chloroplast
d)
lysosome
10.
What can only be found in plant cells?
a)
Cell membrane
b)
Vacuole
c)
Chloroplast
d)
Mitochondrion
11.
The two kinds of cells are Prokaryotes and Eukaryotes. How are they different?
a)
Prokaryotes have a nucleus.
b)
Eukaryotes have a nucleus.
c)
Prokaryotes are plant cells.
d)
There is no difference.
12.
What cell part is NOT found in all cells?
a)
Cell Wall
b)
Cell Membrane
c)
Cytoplasm
d)
Genetic Material
13.
Complex cell. Can be plant or animal. Contains membrane bound organelles.
a)
Eukaryotic Cell
b)
Prokaryotic Cell
c)
Bacteria
d)
Blood cell
14.
This organelle takes food and turns it into ENERGY for plant and animal cells.
a)
Chloroplast
b)
Mitochondria
c)
Lysosome
d)
Ribosome
15.
The site of photosynthesis
a)
ribosome
b)
mitochondria
c)
chloroplast
d)
nucleus
16.
Which part of the cell is often called "the brain of the cell"?
a)
nuclear membrane
b)
endoplasmic reticulum
c)
nucleus
d)
mitochondria
17.
Where are proteins made?
a)
Golgi body
b)
Mitoichondria
c)
Chromosomes
d)
Ribosomes
18.
A rigid layer that lies outside the cell's membrane is...
a)
Cytoskeleton
b)
Cilia
c)
Cell Wall
d)
Flagella
19.
What organelle is called the "powerhouse" of a cell?
a)
Endoplasmic Reticulum
b)
Nucleus
c)
Mitochondria
d)
Nucleolus
20.
Main producer of ATP in all eukaryotes
a)
chloroplast
b)
mitochondria
c)
lysosome
d)
smooth er
21.
What is the function of the vacuole?
a)
Sac that stores water, nutrients, and waste products
b)
Sac filled with digestive chemicals
c)
Jelly-like substance within the plasma membrane
d)
stack of membranes that packages chemicals
22.
I store water in both plant and animal cells. What am I?
a)
cytoplasm
b)
ribosomes
c)
vacuole
d)
lysosomes
23.
What can only be found in plant cells?
a)
Cell membrane
b)
Vacuole
c)
Chloroplast
d)
Mitochondrion
24.
Only eukaryotic cells have....
a)
membrane-bound organelles
b)
DNA
c)
ribosomes
d)
cell membranes
25.
A nucleus is found in what type of cell?
a)
Prokaryotic
b)
Eukaryotic
c)
Both prokaryotic and eukaryotic
d)
Neither prokaryotic or eukaryotic
26.
It is true that the cell is the basic unit of life.
a)
it is true
b)
it is false
c)
this is not part of the cell theory
d)
only some parts of this are true
27.
rocks are composed of cells
a)
this is true
b)
this is false
c)
a rock has minerals in it
d)
it had cells once
28.
cells are not the basic units of structure and function in living things
a)
this is true
b)
this is false
c)
cells make up living and nonliving things
d)
cells only come from animals
29.
prokaryotic cells have nuclei
a)
this is true
b)
this is false
c)
prokaryotic and eukaryotic cells both have nuclei
d)
bacteria have nuclei
30.
which type of organisms are prokaryotes?
a)
animals
b)
bacteria
c)
plants
d)
fungi
31.
eukaryotic cells enclose their DNA in a nucleus.
a)
this is true
b)
this is false
c)
eukaryotic cells do not have nuclei
d)
only prokaryotic cells have nuclei
32.
Enzymes are considered to be
a)
Lipids
b)
Carbohydrate
c)
Protein
d)
Nucleic Acid
33.
What is the purpose of an enzyme?
a)
give permission for the reaction
b)
raise activation energy
c)
speed up reactions
d)
control how many reactions occur
34.
Where do substrates bind on an enzyme?
a)
voltage-gated channels
b)
surface receptor
c)
calcium channels
d)
active site
35.
Enzymes are capable of increasing the rate of a chemical reaction within a living cell. Enzymes accomplish this through which of the following means?
a)
reducing the number of products
b)
reducing the activation energy
c)
increasing the temperature of the cell
d)
increasing the concentration of reactants
36.
What is structure A?
a)
Substrate
b)
Active site
c)
Enzyme
d)
Products
37.
What is structure D?
a)
Substrate
b)
Active site
c)
Enzyme
d)
Products
38.
What is structure C?
a)
Substrate
b)
Active site
c)
Enzyme
d)
Products
39.
What is structure E, F, G?
a)
Substrate
b)
Active site
c)
Enzyme
d)
Products
40.
How do enzymes speed up chemical reaction?
a)
Increasing activation energy
b)
Decreasing activation energy
c)
Increasing deactivation energy
d)
Decreasing deactivation energy
41.
What is a substance called if it speeds up a chemical reaction?
a)
reusable
b)
catalyst
c)
specific
d)
fragile
42.
Each enzyme only has 1 substrate that will fit its active site. What is this called?
a)
reusable
b)
catalyst
c)
specific
d)
fragile
43.
Changes in pH and temperature can damage an enzymes active site. What is this called?
a)
reusable
b)
catalyst
c)
specific
d)
denatured
44.
Once a new product leaves an enzyme, the enzyme is unchanged and ready for the next substrate. What is this called?
a)
reusable
b)
catalyst
c)
specific
d)
fragile
45.
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.
46.
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 .
47.
What is the name for the mechanism of enzyme activity?
a)
Lock and key
b)
jigsaw puzzle
c)
hammer and nail
d)
two hands pattern
48.
The "lock and key hypothesis" attempts to explain the mechanism of?
a)
Vacuole formation
b)
Pinocytosis
c)
Sharing of electrons
d)
Enzyme specificity
49.
Any substance that is acted upon by an enzyme is called a(n)?
a)
Coenzyme
b)
Substrate
c)
Vitamin
d)
Polypeptide
50.
After the enzyme and substrate bind together and perform the reaction, what does the substrate become?
a)
a substrate
b)
an enzyme
c)
a product
d)
an active site
51.
Homeostasis
a)
allows for a wildly fluctuating internal environment
b)
is impossible in vertebrates
c)
is the maintenance of a relatively stable internal environment and often incorporates a form of feedback regulation
d)
is the maintenance of a relatively stable external environment and often incorporates a form of feedback regulation
52.
Homeostasis in the human body is often maintained by a:
a)
neutral feedback loop
b)
solar feedback loop
c)
positive feedback loop
d)
negative feedback loop
53.
What is another word that can be used to describe "homeostasis"?
a)
STABLE
b)
EQUAL
c)
COMPLETE
d)
CORRECT
54.
If the environment gets cold, we will often shiver in order to:
a)
keep body temperature the same as the external temperature
b)
decrease body temperature
c)
increase body temperature
d)
regulate blood pressure
55.
Homeostasis in the human body is often maintained by a:
a)
neutral feedback loop
b)
solar feedback loop
c)
positive feedback loop
d)
negative feedback loop
56.
The maintenance of an organism’s internal environment is called:
a)
compensating
b)
homeostasis
c)
balancing
d)
routine
57.
A tissue, gland or organ that performs a response is called:
a)
a receptor
b)
a stimulus
c)
a control center
d)
an effector
58.
During a positive feedback loop, the original stimulus is:
a)
amplified or enhanced
b)
counteracted
c)
removed
d)
negated
59.
Homeostasis
a)
allows for a wildly fluctuating internal environment
b)
is impossible in vertebrates
c)
is the maintenance of a relatively stable internal environment and often incorporates a form of feedback regulation
d)
is the maintenance of a relatively stable external environment and often incorporates a form of feedback regulation
60.
The control center of a feedback loop is almost always:
a)
the spinal cord
b)
the hear
c)
the brain
d)
the nerves
61.
When you get cut, your skin cells release hormones that signal platelets to come and stop the bleeding. Platelets then release more hormones that signal even more platelets to help stop bleeding. The hormone signals continue until the cut is closed.
a)
Positive Feedback Response
b)
Negative Feedback Loop
62.
When you are cold, you shiver and your blood vessels contract, which warms you up. When you are hot, you sweat and your blood vessels expand, which cools you down.
a)
Positive Feedback Response
b)
Negative Feedback Loop
63.
This is an example of ______________ feedback
a)
Positive
b)
Negative
c)
Middle
d)
None of the above
64.
What type of feedback loop is shown?
a)
negative
b)
neutral
c)
positive
65.
An example of Negative Feedback Loop could be
a)
Hormones released when giving birth
b)
Production of milk during nursing
c)
Water constantly running
d)
Maintaining Oxygen levels
66.
As you get dehydrated, your blood becomes thicker and harder to pump. Your kidneys will respond by stopping urine production, sending the water from urine into your bloodstream to thin your blood back to normal level.
a)
Positive Feedback Response
b)
Negative Feedback Loop
67.
Rapid growth during puberty causes your body to release more and more growth hormones. As you grow, more and more growth hormones are released until puberty is reached, and then the hormones stop.
a)
Positive Feedback Response
b)
Negative Feedback Loop
68.
When glucose levels in the blood rise, your brain sends a signal to your pancreas. The pancreas releases insulin, which opens channels in cell membranes to allow glucose to enter the cell, lowering blood sugar levels.
a)
Positive Feedback Response
b)
Negative Feedback Loop
69.
If the calcium in your blood decreases below homeostasis levels, a gland in the brain will sense the decrease and send a chemical message to your bones. Your bones will release calcium into the blood, bringing blood calcium levels back up.
a)
Positive Feedback Response
b)
Negative Feedback Loop
70.
Feedback loops are important because they allow organisms and the environment to
a)
change based on new inputs
b)
fall apart
c)
change based on new outputs
d)
maintain balance
71.
Humans have ___ for body temperature, blood glucose concentrations, electrolyte concentrations, pH levels, tendon tension and variables.
a)
positive feedback mechanisms
b)
specific set points
c)
a wide internal range
d)
no regulation
72.
When you get cut, your skin cells release hormones that signal platelets to come and stop the bleeding. Platelets then release more hormones that signal even more platelets to help stop bleeding. The hormone signals continue until the cut is closed.
a)
Positive Feedback Response
b)
Negative Feedback Loop
73.
Negative Feedback Loops:
a)
amplify processes
b)
counteract the original stimulus
c)
are initiated during childbirth
d)
are found only in plants
74.
Failure to maintain homeostasis could result in:
a)
lack of internal balance
b)
eventual death
c)
difficulty carrying on metabolism
d)
all three
75.
The process of apples ripening on a tree is an example of:
a)
negative feedback loop
b)
positive feedback loop
76.
The two types of feedback systems that help organisms maintain homeostasis are:
a)
positive and negative
b)
receptor and effector
c)
static and dynamic
d)
minor and major
77.
Organs like your eyes or cells that detect pressure in your skin are referred to as ______. They take in stimuli from the outside world.
a)
effectors
b)
control centers
c)
negative feedback loops
d)
receptors
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