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Cellular Organization and Homeostasis Unit Review

Total questions: 50

Worksheet time: 1hrs 12mins

Name
Class
Date
1.
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
2.

Negative Feedback Loops:

a)

increase effects

b)

stop small changes from getting larger

c)

are initiated during childbirth

d)

are found only in plants

3.
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 
4.

Temperature, exercise, hydration, sugar levels, nourishment, and diseases all affect homeostasis.

a)

True

b)

False

5.
Which of the following is an example of positive feedback to indirectly maintain homeostasis?
a)
the chemical reactions involved in blood clotting
b)
your blood vessels dilate and you begin to sweat in response to elevated body temperature
c)
your blood vessels constrict and you begin to shiver in response to low body temperature
d)
your coach compliments you on your performance in practice
6.
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
7.
Positive feedback is when the change caused by the stimulus is
a)
decreased
b)
non existant
c)
increased
d)
changes constantly
8.
Water diffusing with the concentration gradient from high water concentration to low water concentration across a cell membrane is....
a)
Facilitated Diffusion
b)
Simple Diffusion
c)
Active Transport
d)
Osmosis
9.
What is a disease where sufferers cannot control their blood glucose levels?
a)
Diabetes
b)
Influenza
c)
Cholera
d)
Cystic fibrosis
10.
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
11.

What might happen if you didn't run a fever when you got sick?

a)

You would recover much more quickly

b)

Your body temperature would drop to dangerous levels

c)

Your immune system would shut down

d)

Your body wouldn't fight off the infection as efficiently as it could

12.

Negative Feedback

a)

a deviation from the norm brings the body back to homeostasis

b)

a regulatory substance transported in the blood to target cells

c)

a deviation from the norm is enhanced until an event occurs

d)

a chemical substance released by nerves

13.
This component of the feedback loop determines/maintains the controlled conditions of our body. 
a)
Receptor 
b)
Glands
c)
Effector 
d)
Control center 
14.
This component of the feedback loop carries out the actual response. 
a)
Receptor 
b)
Enhancer 
c)
Effector
d)
Brain 
15.

During child birth a woman's body over produces a hormone called oxytocin until the baby is born. What kind of feedback loop would this be?

a)

Negative Feedback Loop

b)

Positive Feedback Loop

c)

Neutral Feedback Loop

d)

Linear Feedback Loop

16.

When you are hot, your body sweats to cool you down. This means your temperature went above normal and your body sweats to counteract that change to bring you back to normal. What kind of feedback loop would this be?

a)

Negative Feedback Loop

b)

Positive Feedback Loop

c)

Neutral Feedback Loop

d)

Linear Feedback Loop

17.

The 4 parts of the communication pathway to maintain homeostasis listed in order are:

a)

target, sensors, control center, effector

b)

effector, sensors, target, control center

c)

sensors, control center, effector, target

d)

target, control center, sensors, effector

18.
What kind of transport does not require energy?
a)
Active 
b)
Vacuole 
c)
Passive 
d)
Na/K Pump 
19.
What is something that prokaryotic and eukaryotic cells have in common?
a)
They have a nucleus. 
b)
They are multi-cellular. 
c)
They have DNA. 
d)
They have organelles that are membrane-bound.
20.
What is facilitated diffusion?
a)
Transport that uses proteins to help move molecules across the membrane. 
b)
Movements of substances through a membrane. 
c)
When molecules spread from High to Low concentration on their own. 
d)
When pressure pushes something through a membrane. 
21.
What macromolecules help to make the cell membrane? 
a)
Proteins 
b)
Carbohydrates 
c)
Phospholipids 
d)
All of the above 
22.
All of the following statements are true about prokaryotic cells EXCEPT 
a)
No nucleus 
b)
They are simple and small 
c)
Have a cell wall 
d)
Have organelles 
23.
What is the significance of the cell membrane? 
a)
Provides protection 
b)
Maintains homeostasis 
c)
Give a cell hydrophobic ends
d)
Provides cholesterol 
24.
What are the 2 parts of a phospholipid? 
a)
Hydrophobic head, hydrophilic tails 
b)
Hydrophobic heads, hydrophobic tails 
c)
Hydrophilic heads, hydrophobic tails 
d)
Hydrophilic heads, hydrophilic tails 
25.
What is an isotonic solution?
a)
When solutions are in equilibrium 
b)
When the solution has more solute 
c)
When the solution has less solute 
d)
Has a greater pressure 
26.
Molecules using simple diffusion move from 
a)
high to low concentrations 
b)
low to high concentrations 
c)
no concentrations  
d)
both concentrations  
27.
The picture  is an example of _________________.
a)
isotonic
b)
diffusion
c)
osmosis
d)
active transport
28.
Which way will the water molecules move during osmosis?
a)
Out of the cell, so the cell shrinks.
b)
Out of the cell, so the cell swells.
c)
Into the cell, so the cell shrinks.
d)
Into the cell, so the cell swells.
29.
What does selectively-permeable mean?
a)
The cell controls what passes in and out of the cell
b)
Nothing gets through
c)
The cell lets only large substances through
30.

If a gummy bear is placed in salt water, the mass of the gummy bear will decrease because water will move out of the gummy bear. What process does this represent?

a)

osmosis

b)

fermentation

c)

respiration

d)

diffusion

31.

The solution surrounding the cell in Diagram B, would be defined as:

a)

hypertonic

b)

hypotonic

c)

isotonic

32.

The solution surrounding the cell in Diagram C, would be defined as

a)

hypertonic

b)

isotonic

c)

hypotonic

33.
What type of solution is this cell in?
a)
Isotonic
b)
Hypertonic
c)
Hypotonic
d)
diffused
34.

What will happen to the cell in the given solution?

a)

Swell up

b)

Shrink

c)

Stay the same

35.
The cells seem to be swelling and about to burst what type of solution are they most likely in?
a)
Hypertonic
b)
Isotonic
c)
Hypotonic
36.
The cells seem to be shriveled and dehydrated what type of solution are they most likely in?
a)
Hypertonic
b)
Isotonic
c)
Hypotonic
37.

Nemo and other ocean dwelling fish cannot survive in freshwater because......

a)

freshwater is hypertonic to Nemo's cells and will result in water leaving them causing the cells to shrink

b)

freshwater is hypotonic to Nemo's cells and will result in water leaving them causing the cells to shrink

c)

freshwater is hypertonic to Nemo's cells and will result in water entering them causing the cells to swell and burst

d)

freshwater is hypotonic to Nemo's cells and will result in water enter them causing the cells to swell and burst

38.
Facilitated Diffusion does not require energy
a)
True
b)
False
39.
Continuous movement of particles but there is no overall change in the concentration is called
a)
osmosis
b)
hypertonic solution
c)
isotonic solution
d)
dynamic equilibrium
40.
If the water concentration in a cell is 90% and the water concentration outside the cell is 95%, what direction will the water move?
a)
Into the cell
b)
Out of the cell
c)
The water will not move
41.

What type of transport is shown in the diagram?

a)

Active transport

b)

Facilitated diffusion

c)

Endocytosis

d)

Simple diffusion

42.
What do the brown structures represent?
a)
Phospholipids
b)
Glycoproteins
c)
Channel Proteins 
d)
Cyctoskeleton Filaments
43.
Hydrophilic portion of cell membrane?
a)
A
b)
C
c)
D
d)
E 
44.
What forms the channels and pumps in the phospholipid bilayer?
a)
carbohydrates
b)
proteins
c)
hydrophilic heads 
d)
lipids
45.
Most of the cell membrane is made of...
a)
Lipids
b)
Carbohydrates
c)
Proteins
d)
Nucleic acids
46.
Name the prokaryote?
a)
animal cell
b)
plant cell
c)
bacteria
d)
fungi cell
47.

What is the major difference between a prokaryote and a eukaryote?

a)

prokaryotes do not have a nucleus

b)

prokaryotes do not have ribosomes.

c)

prokaryotes do not have a cell membrane.

d)

prokaryotes do not contain DNA

48.
What determines the rate of nutrients and waste are exchanged from the cell and the environment?
a)
surface ratio
b)
volume
c)
surface area
d)
surface area to volume ratio
49.
As a cell becomes larger, its
a)
surface area increases faster than its volume.
b)
volume increases faster than its surface area
50.
The larger a cell is, the more difficult it is for the cell to move enough nutrients and wastes across its cell membrane to maintain its normal functions.
a)
True
b)
False

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