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Homeostasis- Transport

Total questions: 30

Worksheet time: 45mins

Name
Class
Date
1.
The cell membrane is a highly selective barrier that controls the movement of substances in and out of the cell.  In fact, polar molecules are unable to go across unless
a)
they are broken down into smaller pieces.
b)
they are enclosed in water-filled vesicles.
c)
they pass through channels in the cell membrane.
d)
they react with other substances to become nonpolar.
2.
Organisms must be able to adapt to a changing external and internal environment.  An organism's ability to maintain a stable internal environment is known as homeostasis.  How does a cell's membrane help an organism maintain homeostasis?
a)
Cell membranes directly control the temperature of the cell.
b)
Cell membranes control the substances that enter or leave cells.
c)
Cell membranes use a large portion of the cell's energy supply.
d)
Cell membranes protect the cell organelles from large doses of radiation.
3.
Normal homeostatic conditions require potassium concentrations to be about 1000 times higher inside the cell than in the blood.
What mechanisms does a cell use to move these small potassium molecules into the cell against the concentration gradient?
a)
passive transport by osmosis
b)
passive transport by diffusion
c)
active transport by proteins
d)
active transport by endocytosis
4.
Which of the following types of passive transport involves water molecules moving from a high concentration to a low concentration?
a)
osmosis
b)
simple diffusion
c)
filtration
d)
facilitated diffusion
5.
Examine the diagrams of plant cells.  Each cell has been placed in a different solution.
The cell in diagram 2 has been placed in a solution that contains __________ the interior of the cell.
a)
water that is warmer than
b)
a lower concentration of water than
c)
the same concentration of water as
d)
water that is cooler than
6.

Cholesterol is an important component of the cell membrane because __________ .

a)

it makes the membrane more fluid and adds to its flexibility

b)

it aids in diffusion

c)

it aids in cell recognition

d)

it transports large, polar molecules

7.

What will be the effect of placing a plant cell in a hypotonic solution?

a)

The plant will wilt.

b)

The cell will shrink in size.

c)

The cell will remain unaffected.

d)

The cell will expand and become turgid.

8.
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
9.
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
10.
Positive feedback is when the change caused by the stimulus is
a)
decreased
b)
non existant
c)
increased
d)
changes constantly
11.
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 
12.

Which way will the water molecules move during osmosis? The dashed line is the cell membrane. The mickey mouse heads represent a water molecule.

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.

13.

During diffusion ______.

a)

substances moves from high to low concentration

b)

water moves when energy is used

c)

large or oddly shaped molecules move across a cell membrane

d)

water moves from high to low concentration

14.

Something is ___________ ____________ when some molecules can cross the membrane while others cannot.

a)

selectively permeable

b)

really small

c)

anaerobic respiration

d)

actively transported

15.
A student noticed that placing wilted lettuce in a bowl of cool water caused the lettuce to become more crisp and firm. What is the best explanation for his observation?
a)
Water moved into the lettuce cells by active transport.
b)
Water moved into the lettuce cells by osmosis.
c)
Salt moved into the lettuce cells by diffusion.
d)
Water moved out of the lettuce cells by osmosis.
16.

In which case would a cell most likely shrink? I encourage you to draw a picture of cell in a solution that is losing water.

a)

when placed in a solution containing a high solute concentration

b)

when placed in a isotonic solution

c)

when placed in a solution containing a low pH

d)

when placed in a solution containing distilled water

17.

Which type of transport requires energy from ATP?

a)

osmosis

b)

facilitated diffusion

c)

active transport

d)

diffusion

18.

An investigation was set up to study the movement of water through a membrane. The results are shown in the diagram below.

Based on these results, which statement correctly predicts what will happen to red blood cells when they are placed in a beaker containing a water solution in which the salt concentration is much higher than the salt concentration in the red blood cells?

a)

The red blood cells will absorb water and increase in size.

b)

The red blood cells will lose water and decrease in size.

c)

The red blood cells will first absorb water, then lose water and maintain their normal size.

d)

The red blood cells will first lose water, then absorb water, and finally double in size.

19.

A biologist observed a plant cell in a drop of water as shown in diagram A. The biologist added a 10% salt solution to the slide and observed the cell as shown in diagram B.

The change in appearance of the cell resulted from

a)

more salt moving out of the cell than into the cell

b)

more salt moving into the cell than out of the cell

c)

more water moving into the cell than out of the cell

d)

more water moving out of the cell than into the cell

20.
What type of feedback loop is shown?
a)
negative
b)
neutral 
c)
positive
21.
What type of feedback loop is shown?
a)
Positive
b)
Neutral
c)
Negative
22.
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 
23.

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. This is an example of what type of feedback?

a)

Positive Feedback Response

b)

Negative Feedback Loop

24.

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. This is an example of what type of feedback?

a)

Positive Feedback Response

b)

Negative Feedback Loop

25.

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. This is an example of what type of feedback?

a)

Positive Feedback Response

b)

Negative Feedback Loop

26.
This organ produces the hormones that help regulate blood glucose levels.
a)
pancreas
b)
liver
c)
small intestine
d)
gall bladder 
27.

Detects change and sends a message to the control center

a)

receptor

b)

control center

c)

effector

d)

regulation

28.

Receives the message from the receptor and coordinates a response

a)

control center

b)

effector

c)

glucagon

d)

homeostasis

29.

The organ/cells that carry out the response

a)

control center

b)

receptor

c)

thermoregulation

d)

effector

30.

_____________ is released by your pancreas when blood glucose levels get too high.

a)

glucose

b)

glucagon

c)

oxygen

d)

insulin

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