Biology 1002B Lecture Notes - Lecture 7: Cystic Fibrosis, Membrane Fluidity, Facilitated Diffusion
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Question 1
Plasma membranes are selectively permeable. This means that
A. | glucose cannot enter the cell. | |
B. | the plasma membrane allows some substances to enter or leave a cell more easily than others. | |
C. | plasma membranes must be very thick. |
Question 2
Oxygen molecules O2 crosse a plasma membrane by
A. | passive transport | |
B. | osmosis | |
C. | active transport |
Question 3
Facilitated diffusion across a biological membrane requires ________ and moves a substance ________ its concentration gradient.
A. energy and channel proteins; against (up) | ||
B. transport proteins that make channels ; down | ||
C. energy ; down |
Question 4
When two aqueous solutions that differ in solute concentration are placed on either side of a semipermeable membrane and osmosis is allowed to take place, the water will
A. move to the side with lower water concentration | ||
B. | move to the side with higher water concentration | |
C. | move to the side with lower solute concentration |
Question 5
Kinetic energy differs from chemical energy in that
A. | chemical energy is a particular form of kinetic energy. | |
B. | kinetic energy is the energy of a moving object, whereas chemical energy is the potential energy of molecules. | |
C. | kinetic energy is stored energy that has the potential to do work, and chemical energy is the energy of movement. |
Question 6
When a cell uses chemical energy to perform work, it uses the energy released from a(n) ________ reaction to drive a(n) ________ reaction.
A. | exergonic; endergonic | |
B. | endergonic; exergonic | |
C. | spontaneous; exergonic |
Question 7
When an enzyme catalyzes a reaction
A. it raises the activation energy of the reaction. | ||
B. it lowers the activation energy of the reaction. | ||
C. it is used once and discarded. |
Question 8
Which of the following statements regarding enzyme function is false?
A. An enzyme's function depends on its three-dimensional shape. | ||
B. Enzymes are very specific for their substrates. | ||
C. Enzymes are used up when they catalyze a chemical reaction so must be synthesized for each new chemical reaction |
1. Which of the following best describes a condition where a membrane separates two solutions that are NOT in equilibrium?
A | a rainbow |
B | equilibrium |
C | a homogeneous solution |
D | neighboring solutions that have unequal concentrations of molecules |
2. In this lab, we will use dialysis tubing to....
A | simulate biological membranes |
B | separate blood from urine |
C | turn starch blue |
D | turn starch brown |
3. Biological membranes have different types of pores and channels, and different permeability to small molecules depending on size and charge. In this lab, you can assume that the dialysis tubing we are using are permeable to....
A | starch |
B | water and potassium iodide |
C | complex sugars |
D | small animals |
4. Kinetic energy is a property of the atom, and also of more complex structures such as molecules. You can actually see kinetic energy of non-living things in action under the microscope. When we visualize this, we call what we see...
A | diffusion |
B | Brownian motion |
C | osmosis |
D | all of the above |
5. One word to describe the effect of water diffusion across a membrane, which alters the water pressure on one side of the membrane with respect to the other is....
A | osmosis |
B | lysis |
C | aquaporin |
D | equilibrium |
6. Suppose that you place a red blood cell in a hypertonic solution containing penetrating molecules. In this environment, you would expect the cell to eventually
A | swell and burst |
B | shrink |
C | remain the same in size |
D | photosynthesize |
7. For the "egg lab", what is the main objective?
A | to determine which egg has more mass |
B | to determine which egg is hypertonic to the other |
C | to determine which solution the egg is placed in is hyper- or hypo-tonic solution |
D | to determine which egg is isotonic with the egg |
8. The main difference between a 'prediction' and a 'hypothesis', is that predictions....
A | are framed as an "if...then...because" statement |
B | are framed as a general statement |
C | are framed as an "always....true" statement |
D | are framed as an "correct....incorrect" statement |
9. Read each of the following procedural steps for plasmolyzing Elodea sprig and then select the correct order below.
Locate a region of healthy cells and sketch a few adjacent cells
Sketch the plasmolyzed cell
While touching one corner of the coverslip with a piece of Kimwipe to draw off the
water, add a drop of concentrated salt solution to the opposite corner
Obtain a leaf from an Elodea or Water sprite plant
A | 4, 2, 3, 1 |
B | 3, 1, 4, 2 |
C | 2, 3, 1, 4 |
D | 4, 1, 3, 2 |