BIOLOGY VCE UNITS 3&4DIAGNOSTIC TOPIC TESTS 2017

TEST 1: PLASMA MEMBRANES, NUCLEIC ACIDS AND PROTEINSTOTAL 40 MARKS (45 MINUTES)

Student’s Name: _________________________ Teacher’s Name: _________________________

Directions to students

Write your name and your teacher’s name in the spaces provided above.Answer all questions in the spaces provided.

Neap Diagnostic Topic Tests (DTTs) are licensed to be photocopied and used only within the confines of the school purchasing them, for the purpose of examining that school’s students only. They may not be placed on the school intranet or otherwise reproduced or distributed. The copyright of Neap DTTs remains with Neap. No DTT or any part thereof is to be issued or passed on by any person to any party inclusive of other schools, non-practising teachers, coaching colleges, tutors, parents, publishing agencies or websites without the express written consent of Neap.

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SECTION A – MULTIPLE-CHOICE QUESTIONS

Question 1

DNA belongs to a group of biomacromolecules called

A. carbohydrates.

B. nucleic acids.

C. lipids.

D. proteins.

Question 2

The monomers of proteins are

A. simple sugars (glucose).

B. nucleotides.

C. fatty acids.

D. amino acids.

Instructions for Section A

Choose the response that is correct or that best answers the question.A correct answer scores 1; an incorrect answer scores 0.Marks will not be deducted for incorrect answers.No marks will be given if more than one answer is completed for any question.Unless otherwise indicated, the diagrams in this booklet are not drawn to scale.

SAMPLE

BIOLOGY VCE UNITS 3&4 DIAGNOSTIC TOPIC TESTSPLASMA MEMBRANES, NUCLEIC ACIDS AND PROTEINS

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SECTION B – SHORT-ANSWER QUESTIONS

Question 1 (8 marks)

The diagram below shows part of a cell membrane.

a. Label the structures.

i. X 1 mark

______________________________________________________________________

ii. Y 1 mark

______________________________________________________________________

iii. Z 1 mark

______________________________________________________________________

b. State the function of the structures.

i. Y 1 mark

______________________________________________________________________

______________________________________________________________________

ii. Z 1 mark

______________________________________________________________________

______________________________________________________________________

c. Explain how the physical properties of phospholipid molecules contribute to the formation of cell membranes. Include a diagram in your answer. 3 marks

___________________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

Instructions for Section B

Answer all questions in the spaces provided. Write using blue or black pen.Unless otherwise indicated, the diagrams in this booklet are not drawn to scale.

XY

Z

SAMPLE

BIOLOGY VCE UNITS 3&4 DIAGNOSTIC TOPIC TESTSPLASMA MEMBRANES, NUCLEIC ACIDS AND PROTEINS

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Question 7 (2 marks)

The diagram below represents a protein molecule.

a. Draw the molecule as it might look after being denatured. 1 mark

b. The protein albumen in egg white can be denatured by whisking (beating).

State one other way of denaturing a protein. 1 mark

___________________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

Question 8 (4 marks)

Look carefully at the diagrams in boxes A., B., C., D. and then at the text in boxes W., X., Y. and Z. below.

Place the letter for each into the table so that they correspond to the correct level of protein structure.

A. B. C. D.

W. X. Y. Z.

Level of structure Diagram (A–D) Diagram (W–Z)

primary

secondary

tertiary

quaternary

cross-linkingbonds

protein chain

polypeptide chain folds on itself to form a 3D structure

amino acids become joined

by peptide bonds to form a polypeptide

two or more polypeptide

chains become entwined and

chemically bonded together

polypeptide chain becomes coiled or pleated

SAMPLE

BIOLOGY VCE UNITS 3&4DIAGNOSTIC TOPIC TESTS 2017

TEST 1: PLASMA MEMBRANES, NUCLEIC ACIDS AND PROTEINS

SUGGESTED SOLUTIONS AND MARKING SCHEME

Neap Diagnostic Topic Tests (DTTs) are licensed to be photocopied and used only within the confines of the school purchasing them, for the purpose of examining that school’s students only. They may not be placed on the school intranet or otherwise reproduced or distributed. The copyright of Neap DTTs remains with Neap. No DTT or any part thereof is to be issued or passed on by any person to any party inclusive of other schools, non-practising teachers, coaching colleges, tutors, parents, publishing agencies or websites without the express written consent of Neap.

Copyright © 2017 Neap ABN 49 910 906 643 58 Pelham St Carlton VIC 3053 Tel: (03) 9639 4318 Fax: (03) 8610 0090 DTTV_BioU3&4_1_17_SS.fm 1 / 4

SECTION A – MULTIPLE-CHOICE QUESTIONS

Question 1 B

DNA is composed of lipids. Complex sugars are carbohydrates. Oils and fats are in the group lipids. Proteins can also be called polypeptides.

Question 2 D

The building blocks of proteins are amino acids. Simple sugars are the building blocks of polysaccharides. Nucleotides are the building blocks of nucleic acids. Fatty acids are one of the components that combine to form lipids.

Question 3 A

Amino acids are transferred to the ribosome by transfer RNA (tRNA).

Question 4 C

This sequence contains uracil so must be from an RNA molecule. The only RNA molecule present is mRNA.

Question 5 A

Proteome includes all the proteins produced by an organism, not just some of the proteins produced.

Question 6 A

Although hydrogen bonds are present within a single amino acid, they do not hold separate amino acids together when they undergo condensation polymerisation.

Question 7 C

Although DNA does have a phosphate group, so does RNA, hence having two nucleotide strands differentiates DNA from RNA.

SAMPLE

BIOLOGY VCE UNITS 3&4 DIAGNOSTIC TOPIC TESTSSOLUTIONS TO PLASMA MEMBRANES, NUCLEIC ACIDS AND PROTEINS

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Question 8 C

Water moves via osmosis to dilute the solute.

Question 9 C

Cholesterol is a solid lipid, therefore the more cholesterol, the more ridged the membrane is. Less cholesterol means the membrane is less rigid and more fluid.

Question 10 D

Production of proteins occurs at the ribosomes. Proteins are transported within the cell by the endoplasmic reticulum. The Golgi apparatus modifies and packages the proteins in vesicles. The vesicles move and fuse with the plasma membrane releasing their contents out of the cell.

SECTION B – SHORT-ANSWER QUESTIONS

Question 1 (8 marks)

a. i. phospholipid 1 mark

ii. glycoprotein 1 mark

iii. protein/protein channel 1 mark

b. i. cell surface receptor for recognition or a docking point for a signalling molecule 1 mark

ii. allows movement of substances into and out of the cell 1 mark

c.

1 mark for labelling correct polar head.1 mark for labelling correct non-polar tail.

Phospholipids consist of a polar head and a non-polar tail. The polar heads are found on the outsides of the membrane whilst the non-polar tails face inwards in a double layer. 1 mark

Question 2 (3 marks)

a. Visking tubing is semi-permeable/partially permeable. 1 mark

b. Sac A will be smaller in size. This is due to distilled water moving out of the sac and into the concentrated sucrose solution by osmosis. 1 mark

Sac B will be larger in size. This is due to distilled water moving into the sac to dilute the concentrated sucrose solution by osmosis. 1 mark

Question 3 (3 marks)

a.

polarnon-polar

2 marks

phosphate group

pentose sugar

nitrogenous base

1 mark

SAMPLE