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Exam 5: Lifes Border: the Plasma Membrane

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Question 41

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Water moves from a:

A) hypotonic environment to a hypertonic environment.
B) hypertonic environment to a hypotonic environment.
C) low free-water solution toward a high free-water solution.
D) solution with more salt to a solution with less salt.

E) A) and B)
F) None of the above

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Question 42

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Cholesterol helps to maintain the correct fluidity of the plasma membrane.

A) True
B) False

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Question 43

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Cystic fibrosis is the result of:

Match the following. A) passive transport B) facilitated diffusion C) simple diffusion D) exocytosis E) active transport F) endocytosis -Uses a transport vesicle to bring large materials into the cell

The plasma membrane is a semipermeable membrane. This means that it is:

You have lost a lot of blood in an accident. In the emergency room the first thing the doctors will need to do is replace lost fluids. The fluids they give you should be:

Cholesterol is a hormone receptor in the plasma membrane.

The functioning of the immune system depends on recognition proteins.

One difference between passive and active transport through a cell membrane is that:

A ________ plasma membrane allows water but not solutes to pass through it.

Calcium ions (Ca²⁺) are present in the endoplasmic reticulum at concentrations 1,000 times higher than in the cytosol (the gel-like part of the cell outside organelles) . One protein on the endoplasmic reticulum membrane is devoted to allowing Ca²⁺ to move from the endoplasmic reticulum to the cytosol, and another protein moves Ca²⁺ from the cytosol to the endoplasmic reticulum. These processes are not trivial-Ca²⁺ released into the cytosol allows, for example, for muscle contraction and communication between nerve cells. In this pair of Ca²⁺ transport proteins, you would predict that the protein moving Ca²⁺ from the endoplasmic reticulum to the cytosol ________, and the protein that moves Ca²⁺ from cytosol to the endoplasmic reticulum ________.

Which of the following is an accurate description of the plasma membrane?

Phagocytosis is a type of ________ in which a cell engulfs another cell.

Having defective proteins in the cell membrane can cause disease.

The chief component of the plasma membrane is the phospholipid bilayer.

Carbohydrate chains serve as the binding sites for many signaling molecules.

The plasma membrane proteins of a cell can be linked to colored marker molecules. In an experiment, you labeled the membrane proteins of one cell with a red marker and the membrane proteins of a second cell with a blue marker. Using your understanding of the fluid-mosaic model, what might you see happen if you connected the plasma membranes of the two cells so that they form one continuous membrane?

Active transport moves a substance against the concentration gradient.

Transport proteins are integral plasma membrane proteins.

Insulin and many other hormones are protein molecules. Based on your knowledge of transport processes, you can say that cells that secrete these types of hormones do so through: