What is the structure of the plasma

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Nomen: IB Biology I

Recitation: Unit 6 Notes- Ch. 2.4

Membranes and Transport Planning Calendar

Objective Aim # Quiz dates

What is the structure of the plasma

membrane? 1 R1 – Wednesday, Feb 5

R6 – Thursday, Feb 6 R9 – Wednesday, Feb 5

How do the chemical properties of the

membrane support its function?

How do passive transport mechanisms help

molecules move across the membrane? 2 R1 – Thursday, February 6 R6 – Friday, February 7 R9 – Friday, February 7

How does the structure of a protein allow it

to function in a membrane? 3 R1 – Monday, February 10

R6 – Monday, February 10 R9 – Monday, February 10

How do active transport mechanisms help

molecules move across the membrane? 4 R1 – Tuesday, February 11 R6 – Tuesday, February 11 R9 – Tuesday, February 11

Unit 6 Quizzes

For every numbered Aim in this packet, you will have a short quiz taking up the first 10 minutes of class ONLY. See the planning calendar above for the quiz dates specific to your recitation.

1. In order to be eligible for the quiz, you must present the completed corresponding section in the packet on the day of the quiz. If that section in packet is not complete, you will receive a zero and cannot take the quiz at all.

2. If you are absent on the day of a quiz, you MUST make it up after school on the day you return otherwise the grade will be a zero.

3. THE QUIZ IS NOT OPEN NOTES. It will be designed to assess the basic knowledge you should grasp

from the sources online and is meant to keep you accountable for taking good notes and paying deep

attention to the information shared for each topic.

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2 Aim #1: What is the structure of the plasma membrane?

Source (24 mins): http://www.educreations.com/lesson/view/2-4-1-draw-and-label-the-cell-membrane/4217010 Purpose of membranes in cells:

Notes on membrane structure:

Draw and annotate a phospholipid below with notes about lipids:

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3 2.4.1 Draw and label a diagram to show the structure of membranes.

Include all labels and notes about Integral Proteins, Glycoproteins, Cholesterol, and Peripheral Proteins.

Review Question

1. Referring to the diagram of a cell membrane below, identify all the labelled structures.

A ...

A

1

...

A

2

...

C ...

D ...

E ...

F ...

G ...

H-I ...

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4 Aim #2: How do passive transport mechanisms help molecules move across the membrane?

2.4.4 Define diffusion and osmosis

2.4.5 Explain passive transport across membranes by simple diffusion and facilitated diffusion

Source (19 mins): http://www.educreations.com/lesson/view/2-4-5-2-4-6-simple-and-facilitated-diffusion/4503563

Hydrophilic:

Hydrophobic:

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5 Simple Diffusion: Facilitated Diffusion:

The mitochondria inside of cell require oxygen to carry out cell respiration. Explain how oxygen moves across the membranes of the mitochondria using vocabulary from the word bank .

Word bank diffuse high / low conc.

conc. gradient nonpolar phospholipid

membrane

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6 Review Questions for diffusion (2.4.4 and 2.4.5)

1. The diagram below shows a channel protein in a membrane. Which parts of the surface of the protein would be composed of polar amino acids? How do you know?

Simple Diffusion Facilitated Diffusion Definition in my

own words Energy Required?

Formal Definition

THE MOVEMENT OF PARTICLES FROM AN AREA OF HIGH CONCENTRATION TO AN AREA OF LOW CONCENTRATION. PARTICLES

MOVE ALONG THEIR CONCENTRATION GRADIENT.

DIFFUSION THAT IS FACILITATED BY A PROTEIN CHANNEL SINCE THE CHEMICAL

PROPERTIES OF THE PARTICLE BEING TRANSPORTED DO NOT ALLOW IT TO

CROSS THE LIPID BILAYER

A labelled sketch that will remind me

of what this word means to me concentration

gradient type of molecule

polarity of

molecule

how it occurs

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7 2. The diagram below shows the diffusion of two molecules, molecule 1 (circles) and molecule 2 (triangles) through the cell membrane.

a. Using your notes, give one reason for each answer to part 2a.

I know 1 is showing ________________ diffusion because:

I know 2 is showing ________________ diffusion because:

b. Predict the relative size and polarity of molecules 1 and 2, giving a reason.

______________________________________________________________________________________________

3. Diffusion occurs in order for the molecules to achieve a state of equilibrium across the membrane.

Based on the diagram below, what do you think equilibrium means?

______________________________________________________________________________________________________________

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8 Source (17 mins): http://www.educreations.com/lesson/view/2-4-4-osmosis/4751936 Define Osmosis:

Hypotonic Solution Isotonic Solution Hypertonic Solution Describe Properties

What happens to an

animal cell and WHY

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9 What happens to a

plant cell and WHY

Review Questions for osmosis (2.4.4) 1. Complete the following sentences:

a. Diffusion is the _ movement of molecules from an area of __

concentration to an area of concentration until ___.

b. Osmosis is the ________ movement of _ from an area of _______________________

to an area of ______ until _.

c. Complete the following sentences:

a. Hypertonic solutions have a ____________ solute concentration than the cells placed in them.

b. Hypotonic solutions have a _____________ solute concentration than the cells placed in them.

c. Isotonic solutions have an _____________ solute concentration to the cells placed in them.

2. Write 2-3 clarifying questions you have about both diffusion and osmosis below.

A note on clarifying questions: Clarifying questions are simple questions of fact. They help to clarify the confusion you

have about a concept that has been presented. Clarifying questions have brief, factual answers.

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10 Aim #3: How does the structure of a protein allow it to function in a membrane?

2.4.3 List four functions of membrane proteins.

Source (18 mins): http://www.educreations.com/lesson/view/2-4-3-functions-of-membrane-proteins/4176841/

Functions of proteins (generally):

1.

2.

3.

4.

Outline the role of membrane proteins in each of the following:

Cell to cell

adhesion

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11

Outline the role of membrane proteins in each of the following:

Channels and Pumps

Enzymes

Receptors

Insulin Receptor Protein and Glucose Transporter (Pump) Protein

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12 Maltase Protein in Intestinal Cells and Glucose Transporter (Pump) Protein

Aim #4: How do

active transport

mechanisms help molecules move across the membrane?

2.4.6 Explain the role of protein pumps and ATP in the active transport across membranes.

Source (13 mins): http://www.educreations.com/lesson/view/2-4-6-active-transport/4506776/

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13 Active Transport Definition in my own

words

Energy Required? Why?

Formal Definition

THE MOVEMENT OF PARTICLES FROM AN AREA OF LOW CONCENTRATION TO AN AREA OF HIGH CONCENTRATION. PARTICLES MOVE AGAINST THEIR

CONCENTRATION GRADIENT. REQUIRES ENERGY INPUT.

A labelled sketch that will remind me of what

this word means to me

concentration gradient

type or polarity of molecule in transport

how it occurs

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14 Review Questions for active transport (2.4.6)

Passive Active

Movement of particles (from area of ___

concentration to area of __ concentration)

Energy?

Membrane proteins used?

Subcategories

1. Describe, in words, the 5 stages of the sodium-potassium pump mechanism.

1. ________________________________________________________________________

2. _______________________________________________________________________

3. _______________________________________________________________________

4. _______________________________________________________________________

5. _______________________________________________________________________

2. Explain why ATP is necessary for active transport.

______________________________________________________________________________________________________________________

Word bank High / low conc.

ATP Na+ ions

K+ ions bind protein pump extracellular fluid

cytoplasm

cell membrane

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15 3. You are a textbook publisher working on a new book about Active Transport. You want to use the below diagram in the book. Write captions underneath each frame in the diagram below to explain what is going on in steps 1-3:

4. Write a clarifying question you have about the content presented in the lecture or about these questions.

A note on clarifying questions: Clarifying questions are simple questions of fact. They help to clarify the confusion you

have about a concept that has been presented. Clarifying questions have brief, factual answers.