Cambridge A Level Biology 9700 — 2006 May/June Paper 1 · Variant 1

Question 1

1 What is the resolution, in nanometres, of an electron microscope and of a light microscope? electron light microscope microscope A 0.5 20 B 0.5 200 C 5.0 20 D 5.0 200

Accepted Answer

B

Question 2

2 ~The diagram shows a drawing of an electron micrograph of a cell.

; ; nucleus

mitochondrion

> — ,,
SS SS

lysosome ——~--(® Swe
' .

cytoplasm

Golgi apparatus

Which structures are surrounded by double membranes?

apparatu s lysosome mitochondrion nucleus cytoplasm
A WA V V V V
B JV x x x x
Cc x x V V x
D x V x x V

Accepted Answer

C

Question 3

3 In which animal cells would Golgi apparatus be most abundant? A ciliated epithelial cells B goblet cells C red blood cells D smooth muscle cells

Accepted Answer

B

Question 4

4 Which adaptation would increase the efficiency of active transport of carbohydrates from a plant cell? A areas where the cell wall is thin B increased permeability of the cell wall C large surface area of the cell surface membrane D selective permeability of the vacuole membrane

Accepted Answer

C

Question 5

5 Which is a feature of all prokaryotic cells? A absence of cell surface membrane B division by mitosis C presence of mitochondria D presence of ribosomes

Accepted Answer

D

Question 6

6 The diagram shows a cell surface membrane. The lipid bilayer has an approximate width of 8 nm. How many times has the diagram been magnified? A 2.5 × 102 B 2.5 × 104 C 2.5 × 106 D 2.5 × 108

Accepted Answer

C

Question 7

7 Which type of reaction takes place when starch molecules are converted into reducing sugars? A condensation B hydrolysis C polymerisation D synthesis

Accepted Answer

B

Question 8

8 A solution of starch is mixed with a solution of amylase. Which reagent should be used to confirm that a reaction had taken place and what would be the appearance of the mixture when the reaction was complete? the appearance of reagent the mixture A Benedict’s solution brick-red B biuret solution blue C ethanol cloudy D iodine in potassium iodide solution blue-black

Accepted Answer

A

Question 9

9 The diagrams show different types of bond found in polysaccharides. 1 3 O O O O O O 2 O O O Which type or types of bond are found in amylose? A 1 only B 2 only C 1 and 3 only D 2 and 3 only

Accepted Answer

A

Question 10

10 At which levels of protein structure do hydrophobic interactions occur? A primary, secondary and tertiary B primary, secondary, tertiary and quaternary C tertiary and quaternary D quaternary only

Accepted Answer

C

Question 11

11 The diagram shows a dipeptide. Which bond is the peptide bond? A B C D R1 O R2 H O N C C N C C H H H H OH

Accepted Answer

C

Question 12

12 The movement of water through the vascular tissue in plants relies on which property of water? A changes in density with temperature B good solvent for ions and polar molecules C high specific heat capacity D strong cohesive forces between molecules

Accepted Answer

D

Question 13

13 Two enzyme experiments were carried out. The first, experiment X, was carried out at a constant temperature of 37 oC. During the second experiment the temperature was increased from 37 oC to 80 oC. Which graph shows the results? A B X X product product concentration concentration time time C D X product X product concentration concentration time time

Accepted Answer

A

Question 14

14 Which properties are characteristic of a non-competitive inhibitor of an enzyme? binding effect of adding more substrate A at active site reduces inhibition B at active site does not reduce inhibition C not at active site reduces inhibition D not at active site does not reduce inhibition

Accepted Answer

D

Question 15

15 Which statement defines active transport? A movement of large molecules through the cell surface membrane into the cytoplasm of a cell B movement of molecules or ions from where they are in a low concentration to where they are in a higher concentration C movement of molecules or ions from where they are in a high concentration to where they are in a lower concentration D net movement of water molecules across a partially permeable membrane from a region of higher water potential to one of lower water potential

Accepted Answer

B

Question 16

16 Which pair of factors is inversely proportional to the rate of diffusion? A concentration gradient and size of diffusing molecule B distance over which diffusion occurs and surface area over which diffusion occurs C size of diffusing molecule and distance over which diffusion occurs D surface area over which diffusion occurs and concentration gradient

Accepted Answer

C

Question 17

17 When cylinders of potato tissue were immersed in a 0.35 mol dm–3 sucrose solution, they showed no change in mass. What will happen when cylinders are immersed in a 0.1 mol dm–3 sucrose solution? A The pressure potential of the cells will become more positive. B The solute potential of the cell will become more negative. C The water potential of the cells will become more negative. D The water potential of the solution will become less negative.

Accepted Answer

A

Question 18

18 Which cell activity must occur before prophase of mitosis can begin? A breakdown of the nuclear envelope B increased production of mRNA C migration of centrioles to opposite poles D replication of DNA

Accepted Answer

D

Question 19

19 What are the conditions in a human cell just before the cell enters prophase? number of number of molecules nuclear envelope spindle present chromatids of DNA in nucleus present A 46 46 yes no B 92 46 no yes C 46 92 yes yes D 92 92 no yes

Accepted Answer

D

Question 20

20 The diagram shows the mitotic cell cycle. When radioactive nucleotides are supplied to dividing cells, at which point will they be incorporated into the chromosomes? mitosis B C D A interphase

Accepted Answer

A

Question 21

21 The diagram shows part of a DNA molecule. Which part is a nucleotide? C B A D

Accepted Answer

A

Question 22

22 Bacteria were grown for many generations in a medium containing a heavy isotope of nitrogen, 15N. They were then transferred to a medium containing the light isotope of nitrogen, 14N. They were given time to replicate DNA and divide once. Their DNA was extracted, spun in a centrifuge and observed using ultra violet light. The DNA with the 15N settled at a lower depth than the DNA with the 14N. Which shows the predicted results after one generation in the medium with the light isotope? A B C D DNA DNA with 14N with 14N DNA with 14N and 15N DNA DNA with 15N with 15N

Accepted Answer

C

Question 23

23 In a genetic engineering experiment a piece of double-stranded DNA containing 6000 nucleotides is transcribed and translated. What is the total number of amino acids used? A 500 B 1000 C 2000 D 3000

Accepted Answer

B

Question 24

24 DNA from a chromosome is analysed and 20 % of its bases are found to be cytosine. Which percentage of uracil molecules will be found in mRNA transcribed from this DNA? A 20 B 30 C 40 D 60

Accepted Answer

B

Question 25

25 The graph shows the relationship between the loss of water vapour through stomata and an environmental factor. loss of water vapour environmental factor What is the environmental factor? A air temperature B atmospheric humidity C light intensity D wind velocity

Accepted Answer

B

Question 26

26 The diagram shows a longitudinal section through transport tissue in a plant stem. X What are the names of the structure labelled X and the tissue in which it is found? structure X tissue A sieve tube phloem B sieve tube xylem C vessel phloem D vessel xylem

Accepted Answer

D

Question 27

27 What is responsible for the movement of water up xylem vessels in plants? A active loading of water against the water potential gradient in the roots and osmosis in the vessels B increasing water potential at the top of xylem vessels, and osmosis in the roots C decreasing water potential at the top of the xylem vessels, with cohesion of water in the vessels D translocation in the leaves, with capillarity in the xylem vessels

Accepted Answer

C

Question 28

28

What does tissue fluid contain?

protein concentration

phagocytes platelets compared to blood plasma
A V JV higher
B x x higher
Cc V x lower
D x JV lower

Accepted Answer

C

Question 29

29 The diagram shows the Bohr Effect. 100 80 X O2 saturation of 60 haemoglobin / % 40 Y 20 0 2 4 6 8 10 partial pressure O2 / kPa What causes the shift from X to Y? A decreased levels of carbon dioxide and high pH B decreased levels of carbon dioxide and low pH C increased levels of carbon dioxide and high pH D increased levels of carbon dioxide and low pH

Accepted Answer

D

Question 30

30 The diagram shows pressure changes in the left side of the heart and aorta over time. The length of this cardiac cycle is 0.6 s. Points 1, 2, 3 and 4 indicate when atrio-ventricular valves and semi- lunar valves either open or close. 16 3 14 2 12 10 pressure / key kPa 8 left ventricle 6 aorta 4 4 left 1 atrium 2 0 0 0.1 0.2 0.3 0.4 0.5 0.6 time / s What is the total time during one cardiac cycle that the atrio-ventricular valves and the semi-lunar valves are both closed at the same time? A 0.03 s B 0.04 s C 0.07 s D 0.21 s

Accepted Answer

C

Question 31

31 Which correctly shows the areas of the respiratory tract that contain cartilage, goblet cells, smooth muscle and cilia (ciliated epithelium)? cartilage goblet cells smooth muscle cilia A bronchus alveoli bronchus bronchus bronchiole bronchiole alveoli bronchiole B trachea bronchiole bronchus trachea bronchus alveoli bronchiole bronchus C trachea trachea trachea bronchiole bronchiole bronchus alveoli alveoli D trachea trachea bronchus trachea bronchus bronchus bronchiole bronchiole

Accepted Answer

D

Question 32

32 The diagram shows stages in the development of the disease emphysema. chronic infection causing inflammation increased number of macrophages cells 1 invade tissue 2 walls releasing enzyme 3 which digests a molecule in the wall What is correct for 1, 2 and 3? 1 2 3 A lymphocytes alveoli elastase B lymphocytes bronchiole ligase C phagocytes alveoli elastase D phagocytes bronchiole ligase

Accepted Answer

C

Question 33

33 The photomicrographs show an artery from a non-smoker and a smoker. non-smoker smoker What is the reason that the smoker’s artery looks like this? A A cancerous tumour has formed and is blocking the lumen. B Nicotine has damaged the artery endothelium causing a plaque. C Tar has stuck to the artery wall forming a blockage. D The artery has become constricted due to carbon monoxide.

Accepted Answer

B

Question 34

34 What do the causative agents of HIV/AIDS, malaria and TB have in common?

they have a cell they have they have th ;
; ey respire
surface membrane genes ribosomes
A v Jv v v
B v x x v
Cc x v x v
D x v x x

Accepted Answer

D

Question 35

35 The antibiotic streptomycin is now proving to be less effective in reducing the incidence of tuberculosis (TB) worldwide. What is the reason for this observation? A Antibiotics such as streptomycin are not effective as antiviral drugs. B Fewer people are living in isolated rural areas and overcrowding occurs in inner cities. C The incidence of HIV infection is increasing, activating previously inactive Mycobacterium. D There is an increase in the number of people infected with drug resistant strains.

Accepted Answer

D

Question 36

36 The diagram shows part of the immune response. cell Q pathogen with chemical P cell R with protein on on surface surface to fit P multiplication What are P, Q and R? P Q R A antibody phagocyte T helper cell B antigen T helper cell B-lymphocyte C antibody T helper cell phagocyte D antigen B-lymphocyte T helper cell

Accepted Answer

B

Question 37

37 New-born babies have natural passive immunity. Why is this only temporary? A No memory cells are produced in the baby. B The antibodies are insufficient in number. C The antibodies only act in the mother. D The immunity is not inherited.

Accepted Answer

A

Question 38

38 A tree carries out photosynthesis and provides organic compounds for other organisms in a forest. It takes carbon dioxide from and returns oxygen to the atmosphere. It takes water from the soil into its roots and its leaves lose water to the atmosphere. Many other organisms live in the tree. Which of these terms applies to the description of the tree? A community B ecosystem C habitat D niche

Accepted Answer

D

Question 39

39 Which box contains only the parts of an ecosystem which are classed as a food web? A B C secondary consumers primary consumers decomposers D energy from primary producers sunlight inorganic minerals inorganic minerals

Accepted Answer

B

Question 40

40 Which process does not make nitrogen-containing compounds available to plants? A ammonification by decomposers B denitrification by denitrifying bacteria C nitrogen fixation in plant root nodules D nitrogen fixation by soil bacteria

Accepted Answer

B

Question paper16 pages

Mark scheme2 pages

Questions as text

Q1 · What is the resolution, in nanometres, of an electron microscope and of a light…

Q2 · ~The diagram shows a drawing of an electron micrograph of a cell

Q3 · In which animal cells would Golgi apparatus be most abundant?

Q4 · Which adaptation would increase the efficiency of active transport of carbohydrates from…

Q5 · Which is a feature of all prokaryotic cells?

Q6 · The diagram shows a cell surface membrane

Q7 · Which type of reaction takes place when starch molecules are converted into reducing…

Q8 · A solution of starch is mixed with a solution of amylase

Q9 · The diagrams show different types of bond found in polysaccharides

Q10 · At which levels of protein structure do hydrophobic interactions occur?

Q11 · The diagram shows a dipeptide

Q12 · The movement of water through the vascular tissue in plants relies on which property of…

Q13 · Two enzyme experiments were carried out

Q14 · Which properties are characteristic of a non-competitive inhibitor of an enzyme?

Q15 · Which statement defines active transport?

Q16 · Which pair of factors is inversely proportional to the rate of diffusion?

Q17 · When cylinders of potato tissue were immersed in a 0.35 mol dm–3 sucrose solution, they…

Q18 · Which cell activity must occur before prophase of mitosis can begin?

Q19 · What are the conditions in a human cell just before the cell enters prophase?

Q20 · The diagram shows the mitotic cell cycle

Q21 · The diagram shows part of a DNA molecule

Q22 · Bacteria were grown for many generations in a medium containing a heavy isotope of…

Q23 · In a genetic engineering experiment a piece of double-stranded DNA containing 6000…

Q24 · DNA from a chromosome is analysed and 20 % of its bases are found to be cytosine

Q25 · The graph shows the relationship between the loss of water vapour through stomata and an…

Q26 · The diagram shows a longitudinal section through transport tissue in a plant stem

Q27 · What is responsible for the movement of water up xylem vessels in plants?

Q28 · What does tissue fluid contain?

Q29 · The diagram shows the Bohr Effect

Q30 · The diagram shows pressure changes in the left side of the heart and aorta over time

Q31 · Which correctly shows the areas of the respiratory tract that contain cartilage, goblet…

Q32 · The diagram shows stages in the development of the disease emphysema

Q33 · The photomicrographs show an artery from a non-smoker and a smoker

Q34 · What do the causative agents of HIV/AIDS, malaria and TB have in common?

Q35 · The antibiotic streptomycin is now proving to be less effective in reducing the incidence…

Q36 · The diagram shows part of the immune response

Q37 · New-born babies have natural passive immunity

Q38 · A tree carries out photosynthesis and provides organic compounds for other organisms in a…

Q39 · Which box contains only the parts of an ecosystem which are classed as a food web?

Q40 · Which process does not make nitrogen-containing compounds available to plants?

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