AMERICAN NATIONAL SCHOOL General Certificate of Education Advanced Level

Size: px

Start display at page:

Download "AMERICAN NATIONAL SCHOOL General Certificate of Education Advanced Level"

Aubrey Watkins
5 years ago
Views:

1 MERIN NTIONL SHOOL General ertificate of Education dvanced Level IOLOGY 9700/01 Paper 1 Multiple hoice lass 1 dditional Materials: Multiple hoice nswer Sheet Soft clean eraser Soft pencil (type or H is recommended) ecember hour RE THESE INSTRUTIONS FIRST Write in soft pencil. o not use staples, paper clips, highlighters, glue or correction fluid. Write your name, entre number and candidate number on the nswer Sheet in the spaces provided unless this has been done for you. There are forty questions on this paper. nswer all questions. For each question there are four possible answers,, and. hoose the one you consider correct and record your choice in soft pencil on the separate nswer Sheet. Read the instructions on the nswer Sheet very carefully. Each correct answer will score one mark. mark will not be deducted for a wrong answer. ny rough working should be done in this booklet. This document consists of 12 printed pages.

2 2 1 Which feature is a characteristic of prokaryotic organisms? a cell wall circular N mitochondria rough endoplasmic reticulum 2 What is meant by resolution in light microscopy? the product of the magnifications of the eyepiece and the objective lenses the shortest distance between two objects that can be seen as separate the size of the smallest object that can be seen twice the wavelength of the light used to illuminate the specimen 3 From which cell organelle are nucleic acids absent? chloroplast Golgi body mitochondrion ribosome 4 For which process is the large surface area of the cristae in the mitochondria important? energy radiation enzyme reactions gaseous exchange protein synthesis 5 What is the general formula for starch? ( 5 H 10 O 5 ) n ( 5 H 10 O 6 ) n ( 6 H 10 O 5 ) n ( 6 H 12 O 6 ) n

3 6 Various substances are identified using the following procedure. 3 enedict s test positive? yes P no iodine in potassium iodide test positive? yes Q biuret test positive? no yes no What could the four substances be? R S P Q R S glucose starch protein lipid glucose sucrose starch protein sucrose protein lipid starch sucrose starch lipid protein 7 Which level of protein structure maintains the globular shapes of enzymes? primary secondary tertiary quaternary 8 What will break an ionic bond between amino acids? condensation high temperature hydrolysis ph change

4 4 9 ells which do not have nucleoli die because they do not have centrioles and cannot divide. mitochondria and cannot release energy. mrn and cannot transcribe N. ribosomes and cannot synthesise protein. 10 Which types of bonds maintain the tertiary structure of a protein molecule? disulfide hydrogen ionic peptide 11 The hexose sugar molecule in the diagram has its six carbon atoms numbered. 6 H 2 OH 5 O 4 1 OH HO 2 OH 3 OH Which carbon atoms join by glycosidic bonds to form amylose and amylopectin? amylose amylopectin 1 to 4 1 to 4 and 1 to 6 1 to 6 1 to 4 and 1 to 6 1 to 4 and 1 to 6 1 to 4 1 to 4 and 1 to 6 1 to 6 12 Which statement about triglycerides is correct? They are made up of three fatty acids combined with glycogen. They are more saturated with hydrogen compared with phospholipids. They form a bilayer in the membranes of cells. They have a lower ratio of oxygen to carbon compared with carbohydrates.

5 5 13 When a peptide bond is formed, which statement is correct? One amino acid loses a hydroxyl group from its amine group. One amino acid loses a hydroxyl group from its carboxyl group. oth amino acids lose a hydrogen atom from their amine group. oth amino acids lose a hydrogen atom from their carboxyl group. 14 Which sequence correctly identifies the change in colours during the enedict s test? blue brown red green yellow blue green yellow brown red blue red green yellow brown blue yellow brown red green 15 Which statement about the fluid mosaic model of membrane structure is correct? The less unsaturated the fatty acid tails of the phospholipid, the more fluid the membrane. The more unsaturated the fatty acid tails of the phospholipid, the more fluid the membrane. The higher the temperature, the less fluid the membrane. The lower the temperature, the more fluid the membrane. 16 Which pair of factors is inversely proportional to the rate of diffusion? concentration gradient and surface area over which diffusion occurs distance over which diffusion occurs and size of diffusing molecule size of diffusing molecule and concentration gradient surface area over which diffusion occurs and distance over which diffusion occurs 17 In the N sequence for sickle cell anaemia, adenine replaces thymine in a TT triplet, forming the triplet T. uring synthesis of the sickle cell haemoglobin molecule, the amino acid valine is incorporated instead of glutamic acid. What is the anticodon in the transfer RN molecule carrying this valine? U U GU GU 18 Which statements are correct about N transcription and translation? transcription translation is semi-conservative produces mrn produces mrn is semi-conservative occurs at the surface of ribosomes produces mrn produces mrn occurs at the surface of ribosomes

6 19 The table shows the sugars and some bases found in RN and N. Which is correct? 6 RN N ribose thymine ribose uracil thymine deoxyribose uracil ribose 20 What is the order of size of cell components? largest smallest centrioles mitochondria lysosomes nucleoli mitochondria nucleoli lysosomes centrioles nucleoli mitochondria centrioles lysosomes nucleoli centrioles mitochondria lysosomes 21 Which structure is present in cells of eukaryotes but not present in cells of prokaryotes? 70s ribosome chromatin mesosome plasmid 22 How is the shape of a polypeptide chain maintained when it is coiled into an α helix? disulphide bonds hydrogen bonds hydrophobic interactions ionic bonds 21 What will break an ionic bond between amino acids? condensation hydrolysis low temperature ph change

7 22 The diagram shows a molecule that is found in cell surface membranes. 7 X Y Z What is present at X, Y, and Z? X Y Z phosphate double-bond carbon chain protein phosphate single-bond carbon chain double-bond carbon chain protein glucose single-bond carbon chain protein phosphate glucose 23 The diagram shows part of a cell surface membrane. X Y Z Which labels are correct? glycoprotein phospholipid protein X Y Z Y Z X Y X Z Z Y X

8 24 Which feature distinguishes starch from glycogen? 8 Starch contains alpha glucose. Starch contains 1,6 glycosidic bonds. Starch has an unbranched component. Starch is a polysaccharide. 25 What is the function of iron in the haemoglobin molecule? It binds oxygen to the haemoglobin molecule. It makes the haemoglobin more soluble in the red blood cell. It stabilises the quaternary structure of the protein. It undergoes reversible oxidation and reduction. 26 Solutions of four food substances are tested for sugars. The table shows the colours of the solutions after testing. Which food is a non-reducing sugar? heated with enedict s solution boiled with hydrochloric acid, neutralised, then heated with enedict s solution blue blue blue orange orange blue orange orange 27 Which structural feature of the N molecule varies? the arrangement of the sugar-phosphate groups the double helical arrangement the order of bases on a single nucleotide chain the pairing of purines with pyrimidines

9 28 The diagram shows the ultrastructure of a eukaryotic cell. Which organelle does not contain nucleic acid? 9 29 Which cell structure can be seen only with an electron microscope? cell surface membrane cell wall chromosome nucleolus 30 When not involved in protein synthesis, ribosomes exist as separate subunits. What do these subunits consist of? mrn and lipid mrn and trn rrn and lipid rrn and protein 31 Which components are present in prokaryotic cells? chloroplasts, N, nuclear envelope chromosomes, mitochondria, nuclear envelope cytoplasm, N, mitochondria cytoplasm, N, ribosomes

10 10 32 Which molecule in the key is sucrose? is a reducing sugar yes no contains pentose sugar contains hexose sugar yes no yes no 33 onds are formed by condensation in cellulose, sucrose and haemoglobin. What are the names of these bonds? cellulose sucrose haemoglobin glycosidic ester ester glycosidic glycosidic peptide peptide glycosidic ester peptide ester peptide 34 Red blood cells were placed in a solution of sodium chloride with a water potential higher (less negative) than the cell contents. Haemoglobin was released from the cells. y what process was the haemoglobin released? active transport exocytosis facilitated diffusion lysis of cell

11 11 35 What are the features of facilitated diffusion? uses protein channels in membrane uses TP molecules move down a concentration gradient 36 The table shows three processes that contribute to transport across cell surface membranes. Which processes are the result of random movement of molecules? diffusion endocytosis osmosis key = random = non random 37 Which statement is true for cellulose, but not true for protein? It is found in cell surface membranes. It is synthesised from identical sub-units. It is used as an energy source. It may be a structural component. 38 Heating with which solution breaks glycosidic bonds? enedict s solution dilute hydrochloric acid dilute sodium hydroxide ethanol

12 12 39 The diagram shows an electron micrograph of a typical animal cell. X What is the function of the membrane system labelled X? carbohydrate metabolism protein synthesis lipid synthesis protein synthesis and transport 40 The diagram shows part of a cell surface membrane. P Q R What is the correct function for each of the structures labelled? regulates membrane fluidity forms hydrogen bonds with water to stabilise membrane transports ions and large polar molecules R R Q P Q R Q R P R P Q

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level UNIVERSITY OF MRIGE INTERNTIONL EXMINTIONS General ertificate of Education dvanced Subsidiary Level and dvanced Level IOLOGY 9700/01 Paper 1 Multiple hoice May/June 2009 *0696099454* dditional Materials: