works citedbreakingbio.net/wp-content/uploads/2017/10/1.3-membrane... · web viewcite all sources...

Essential Biology 1.3 Membrane Structure Due Date:

Student Name: Candidate Number: 002171-xxx

Blog resource: http://tinyurl.com/29xwrqp Click4Biology: http://tinyurl.com/24zeu45

Cite all sources using the CSE method (or ISO 690 Numerical in Word). The first example has been done for you. Highlight Objective 1 command terms in yellow and answer these before class. Highlight all other command terms in green and complete these during or after class.

Complete the self-assessment rubric before submitting to Moodle. Avoid printing this if possible.

1. Define the plasma membrane. A selectively permeable membrane which encloses the cell.Also known as a cell membrane.(1)

2. Draw and label a simplified (2D) diagram of the plasma membrane. Include: phospholipid bilayer, integral and peripheral proteins, glycoproteins and cholesterol. Why is it described as a bilayer?

3. List six functions of the plasma membrane.

4. Explain why the plasma membrane described as a fluid mosaic model.

Stephen Taylor Bandung International School http://sciencevideos.wordpress.com

http://sciencevideos.wordpress.com/

http://tinyurl.com/24zeu45

http://tinyurl.com/29xwrqp



5. State the functions of these plasma membrane components.

a. glycoproteins

b. cholesterol

6. Match the following membrane proteins with their functions:

Channel/ carrier proteins used in cell surface reactions

Protein pumps binding cells together

Receptor proteins communication between cells

Enzymes passive transport across the membrane

Adhesion proteins active transport across the membrane

Neurotransmitter receptors hormone binding and recognition

7. Draw a single phospholipid molecule. Label the hydrophobic and hydrophilic sections.

8. Explain how hydrophobic and hydrophilic properties of the phospholipid bilayer allow a membrane to maintain its structure.





9. Define selectively permeable in the context of the plasma membrane.

10. Define diffusion.

Define osmosis.

11. Distinguish between solute, solvent and solution.

12. List four ways to maximize the rate of diffusion of a substance across a membrane.

a.

b.

c.

d.

13. Outline the conditions required for the following methods of membrane transport:

Concentration gradient

Selectively permeable membrane.

Membrane proteins

ATP (source of energy)

Simple diffusion yes Yes no no

Osmosis Yes

Facilitated diffusion yes

Active transport yes





14. State the membrane transport methods used by the following molecules:

Water:

Non-polar molecules (with the concentration gradient):

Polar molecules (with the concentration gradient):

Any molecule against the concentration gradient:

Macromolecules:

15. Explain what is happening in this diagram:

16. Explain how osmosis can lead to plasmolysis, using a labeled diagram.





17. ATP is the source of energy for active transport. Explain how ATP releases energy, using a simple diagram.

18. Distinguish between uniport, symport and antiport as different methods of active transport. A simple diagram of each will help.

19. Annotate the diagram below to show how a protein pump is used in active transport of molecules across a plasma membrane. The Na+/K+ pump is an example.

20. Define macromolecule. Give one example of a macromolecule produced in the cell.





21. Define vesicle.

22. Complete and annotate the diagram below to show the process of vesicle transport of a protein molecule through a eukaryote cell. Begin with protein synthesis in the Rough ER and finish with exocytosis though the plasma membrane. Label all organelles shown.

23. Distinguish between exocytosis and endocytosis.





24. Describe how the plasma membrane breaks and reforms during exocytosis and endocytosis. How does the fluidity of the membrane allow this?

25. A study was carried out to determine the relationship between the diameter of a molecule and its movement through a membrane. The graph below shows the results of the study.

H igh

L o w

R ela tiv e ab ili ty to m o v eth ro u g h a m e m b ran e

0 0 .4 0 .8 1 .2 1 .6

M o le cu la r d iam e te r / n m





[Source: Knox, et al., Biology, Mcgraw Hill, Sydney, 1994, page 65]

(a) From the information in the graph alone, describe the relationship between the diameter of a molecule and its movement through a membrane.

(2)

A second study was carried out to investigate the effect of passive protein channels on the movement of glucose into cells. The graph below shows the rate of uptake of glucose into erythrocytes by simple diffusion and facilitated diffusion.

5 0 04 5 04 0 03 5 03 0 02 5 02 0 01 5 01 0 0

5 00

0 1 2 3 4 5 6 7 8 9 1 0 11 1 2 1 3 1 4 1 5 1 6 1 7E x te rn a l co n c en tra tio n o f g lu co se / m m o l d m

fac ilita ted d iffu s io n

s im p le d iffu s io n

R a te o f g lu co se u p tak e /m m o l c m c e lls h r– 3

– 3

– 1

(b) Identify the rate of glucose uptake at an external glucose concentration of 4 mmoldm-3by

(i) simple diffusion.(1)

(ii) facilitated diffusion.(1)





(c) (i) Compare the effect of increasing the external glucose concentration on glucose uptake by facilitated diffusion and by simple diffusion.

(3)

(ii) Predict, with a reason, the effect on glucose uptake by facilitated diffusion of increasing the external concentration of glucose to 30 mmoldm-3.

(2)(Total 9 marks)

Works Cited1. Plasma Membrane. Dictionary.com. s.l. : Random House, 2010.

2. Allott, Andrew.IB Study Guide: Biology for the IB Diploma. s.l. : Oxford University Press, 2007. 978-0-19-915143-1.

3. Taylor, Stephen. 2.4 Membranes (presentation). Science Video Resources. [Online] October 2010. http://sciencevideos.wordpress.com/bis-ib-diploma-programme-biology/02-cells/cell-membranes/.





Self Assessment:

Essential Biology Assessment

Criterion Complete (2) Partially complete (1) Self MrTPresentation

&Organisation NA Complete and neat. All command terms highlighted, tables and diagrams well presented.

Academic Honesty NA

Sources cited using the CSE (ISO 690 numerical) method, with Works Cited section complete and correct.

Objective 1 understanding

All answers for the following command terms correct:

Most answers for the following command terms correct:

Define Draw Label List Measure State

Objective 2 understanding

All answers for the following command terms correct: Most answers for the following command terms correct:

Annotate Apply Calculate Describe Distinguish Estimate Identify Outline

Objective3understanding

All answers for the following command terms correct: Most answers for the following command terms correct:

Analyse Comment Compare Construct Deduce Derive Design Determine DiscussEvaluate Explain Predict Show Solve Sketch Suggest

Logic, notation, mathematical

workingNA

Answers are presented in a logical and concise manner. SI units used most times, with correct

unit symbols and definitions of terms. All mathematical working shown.

Further research NA

Evidence is apparent of research and reading beyond the textbook and presentations to find correct answers to challenging questions. If any questions are unanswered, this criterion scores

zero.

Total (max 10):



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