Cambridge A Level Biology 9700 — 2009 Oct/Nov Paper 1 · Variant 2

Question 1

1 Which cell structure can be seen only with an electron microscope? A cell surface membrane B chromosome C nucleolus D vacuole

Accepted Answer

A

Question 2

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

Accepted Answer

D

Question 3

3 A lymphocyte has a diameter of 1 × 10–2 millimetres (mm). What is the diameter in nanometres (nm)? A 1 × 101 B 1 × 102 C 1 × 103 D 1 × 104

Accepted Answer

D

Question 4

4 Which plan diagram of a transverse section of a leaf correctly shows the position of xylem and phloem as well as the fact that the palisade mesophyll is twice as thick as the spongy mesophyll? A B xylem phloem phloem xylem C D xylem phloem phloem xylem

Accepted Answer

C

Question 5

5 The photomicrograph of a cell has a 2 cm scale line labelled 5 µm. 5 µm What is the magnification of the photomicrograph? A 1 × 103 B 2 × 103 C 4 × 103 D 5 × 103

Accepted Answer

C

Question 6

6 What is a function of the smooth endoplasmic reticulum? A protein synthesis B protein transport C steroid synthesis D steroid transport

Accepted Answer

C

Question 7

7 Which combination of bond types correctly shows the weak and strong bonds that hold a molecule of protein in shape? types of bond hydrogen disulfide ionic A strong strong weak B strong weak strong C weak strong strong D weak strong weak

Accepted Answer

D

Question 8

8 Which statement is true for cellulose, but not true for protein? A It is found in cell surface membranes. B It is synthesised from identical sub-units. C It is used as an energy source. D It may be a structural component.

Accepted Answer

B

Question 9

9 The diagram shows a triglyceride molecule that has been partially hydrolysed. H H C OH H C OH O H H H H H H H H H H C O C C C C C C C C C H C H C H H H H H H H H H C H H C H H C H H C H H C H H C H C H H H What will be the products of the total hydrolysis of the molecule shown? A a molecule of glycerol and a saturated fatty acid molecule only B a molecule of glycerol and an unsaturated fatty acid molecule only C a molecule of water, a molecule of glycerol and a saturated fatty acid molecule D a molecule of water, a molecule of glycerol and an unsaturated fatty acid molecule

Accepted Answer

B

Question 10

10 The diagram shows a tripeptide molecule. H H O H C C C OH H H NH 1 H O H H C C C C 2 O H H 3 NH H H H C C C 4 O H NH2 At which two points will hydrolysis occur to release three amino acids? A 1 and 2 B 1 and 3 C 2 and 3 D 2 and 4

Accepted Answer

D

Question 11

11. Which combination of procedures would not be used in a food test?

use biuret use Benedict’s boil with
use heat : ;
reagent reagent dilute acid
A Jv Jv
B Jv Jv
Cc Jv Jv Jv
D

Accepted Answer

B

Question 12

12 HIV-1 protease is an enzyme produced by the HIV virus. Two identical chains of 99 amino acids form the enzyme. In each chain, amino acids 25, 26 and 27 in the sequence form part of the active site. Which orders of protein structure control the shape of the active site? A primary, secondary, tertiary and quaternary B primary, secondary and tertiary only C primary and quaternary only D quaternary only

Accepted Answer

A

Question 13

13 Which features of collagen result in it having high tensile strength? 1 covalent bonds form between adjacent molecules 2 each three-stranded molecule is held together by hydrogen bonds 3 every third amino acid in the polypeptide is small 4 the primary structure is held together by peptide bonds A 1 and 2 B 1, 2 and 3 C 1, 3 and 4 D 2, 3 and 4

Accepted Answer

B

Question 14

14 The diagram shows a red blood cell and the concentrations of ions, in mmol dm−3, in the plasma and in the cell. Na+ 15 K+ 150 Cl 73 Na+ 144 K+ 5 Cl 111 Which ions are actively transported into and out of the cell? into cell out of cell A Cl − K+ B K+ Na+ C Na+ Cl − D Na+ K+

Accepted Answer

B

Question 15

15 Diagrams 1 and 2 show how the transverse section through a leaf changes when moved from one solution W to a different solution Y. X X W Y diagram 1 diagram 2 How has the water potential changed in diagram 2? difference in cells at X in solution Y compared to difference in solution Y the same cells in compared to solution W solution W A less negative less negative B less negative more negative C more negative less negative D more negative more negative

Accepted Answer

A

Question 16

16 In an experiment, 5 cm3 of 1 % salivary amylase are added to 100 cm3 of different concentrations of starch. Which graph shows the results of plotting the initial rate of reaction (y-axis) against the concentration of substrate (x-axis)? A B 0 0 C D 0 0

Accepted Answer

A

Question 17

17 Cystic fibrosis is a disease where Cl – ions are unable to be transported into cells. Which structure in the cell surface membrane is faulty? A B C D

Accepted Answer

C

Question 18

18 Cancer cells divide out of control, forming tumours. Which statement describes the difference between a cancer cell and a normal cell? A Cancer cells do not undergo cytokinesis. B Cancer cells have a shorter interphase. C Cancer cells do not have metaphase. D Only cancer cells have mutated DNA.

Accepted Answer

B

Question 19

19 Which statement describes a cell that is capable of reproduction and belonging to a haploid organism? A It has chromosomes that contain one polynucleotide chain. B It is capable of carrying out a reduction division to form gametes. C It possesses two copies of each gene as a result of fertilisation. D It will undergo cell division by mitosis during asexual reproduction.

Accepted Answer

D

Question 20

20 During which stage of the mitotic cell cycle is DNA replicated? A anaphase B interphase C prophase D telophase

Accepted Answer

B

Question 21

21 What does the enzyme DNA polymerase synthesise in a cell? A a polypeptide using DNA as a template B a strand of DNA using a polypeptide as a template C a strand of DNA using DNA as a template D a strand of mRNA using DNA as a template

Accepted Answer

C

Question 22

22 The following statements describe events that take place during DNA replication and transcription. Which statement is not correct? DNA transcription replication A adenine pairs with thymine yes no B both DNA polynucleotide chains act as templates yes no C the original DNA molecule is changed after the process no yes D uracil pairs with adenine no yes

Accepted Answer

C

Question 23

23 A peptide consists of ten amino acids of four different kinds. What is the theoretical minimum number of tRNA molecules required to translate the mRNA for this peptide? A 4 B 10 C 12 D 30

Accepted Answer

A

Question 24

24 Which diagram shows the semi-conservative replication of a section of a molecule of DNA? A B T T A T U A G G C G G C G P G C G P G C P P C C G C C G P P A P T A P T A A P P G P C G P C G G T A T A T A T A C G C G T U A P P T A P P T C G G C G G P P P P C G G C G G P P P P T A A T A A G C C G C C A T T A U T C D U A T A G C G C G C G C C G C G A U A T G C G C U A T A U A T A C G C G T U A P P A U A P P A T P P P P C G C G C G C G P P P P P P P P C G C G C G C G P P P P P P P P U A T A T A U A G C G C G C G C A T A U A U A T

Accepted Answer

A

Question 25

25 What is the sequence of events in the translocation of assimilates? A active loading of sucrose into sieve elements via companion cells at the source, increased hydrostatic pressure, mass flow, unloading at the sink B hydrolysis of storage compounds in sinks, lowered water potential in sink, unloading of sucrose from sieve elements down the water potential gradient, mass flow from the source C lowered pressure in sieve elements at the source, movement of sucrose down the pressure gradient from companion cells, mass flow down a diffusion gradient to the sink D mass flow of dissolved sucrose via companion cells into the sieve element at the source, lowered hydrostatic pressure, diffusion of sucrose down concentration gradient to sink, active unloading

Accepted Answer

A

Question 26

26 Which description states some of the features of xylem vessels? A cells joined to form a tube, pits at intervals, sieve plates between cells, surrounded by the endodermis in roots B contains cells joined end to end, containing peripheral cytoplasm, cell walls with secondary thickening of lignin, located to the outside of phloem in vascular bundles C contains elongated cells with end walls broken down, located in vascular bundles in the stem and centrally in the roots D dead elongated cells, lignified cell walls with pits at intervals, associated with companion cells in the roots only

Accepted Answer

C

Question 27

27 The diagram shows the changes in pressure potential (ΨP), solute potential (ΨS) and water potential (Ψ) when a plasmolysed plant cell is placed in pure water. + X kPa 0 time Y Z – Which shows the correct curves for each potential? X Y Z A Ψ ΨP ΨS B ΨP ΨS Ψ C ΨS Ψ ΨP D ΨP Ψ ΨS

Accepted Answer

D

Question 28

28 The graph shows the percentage saturation of haemoglobin with oxygen at different partial pressures of oxygen. Which range of partial pressures of oxygen produces the greatest change of percentage saturation of haemoglobin per unit oxygen tension? 100 D D D C C C 80 60 B B B % saturation of haemoglobin with oxygen 40 A A A 20 0 0 5 10 15 20 partial pressure of oxygen / kPa (oxygen tension)

Accepted Answer

B

Question 29

29 When stained, which features, visible under the light microscope, are part of the cells of the plant tissues listed in the table? xylem elements sieve tube elements companion cells A cytoplasm lignin nuclei B lignin cytoplasm nuclei C lignin nuclei cytoplasm D nuclei cytoplasm lignin

Accepted Answer

B

Question 30

30 A disease damages alveoli. Which effect does this have on the gas exchange surface area and volume of the lungs? surface area volume A decreased decreased B decreased no change C increased increased D increased no change

Accepted Answer

B

Question 31

31 An oxygen molecule diffuses directly from the air in an alveolus to haemoglobin in a red blood cell. What is the minimum number of cell surface membranes through which this molecule must pass? A 2 B 3 C 4 D 5

Accepted Answer

D

Question 32

32 What would be seen in an electron micrograph of a bronchus wall? 1 cartilage cells 2 ciliated cells 3 exocytotic vesicles A 1 and 2 B 1 and 3 C 2 and 3 D 1, 2 and 3

Accepted Answer

D

Question 33

33 Below are correct statements comparing blood, tissue fluid and lymph in a capillary bed. • W lacks large plasma proteins and red blood cells and has a higher water potential than Z. • X is at a lower pressure than Y and contains red blood cells and large plasma proteins. • Y is at a higher pressure than W and contains red blood cells and large plasma proteins. • Z is at a lower pressure than Y and lacks red blood cells. Which correctly identifies W, X, Y and Z? W X Y Z blood entering blood leaving A lymph tissue fluid capillary capillary blood leaving blood entering B lymph tissue fluid capillary capillary blood entering blood leaving C lymph tissue fluid capillary capillary blood leaving blood entering D tissue fluid lymph capillary capillary

Accepted Answer

D

Question 34

34 After an immune response, memory cells remain in the blood for a long time. What is the function of memory cells? A They can ingest invading bacteria. B They contain lots of antibodies. C They divide to make plasma cells. D They kill cells infected with virus.

Accepted Answer

C

Question 35

35 What are produced by B-lymphocytes?

killer lymphocyte memory cells plasma cell
clones clones
A v v x
B v x v
Cc v v v
D x v v

Accepted Answer

D

Question 36

36 Scientists are concerned that avian (bird) flu caused by the H5N1 virus, could infect humans and cause a pandemic. If this occurs, which factors could help prevent humans spreading the disease? 1 killing all poultry 2 reducing all air flights 3 taking a course of antibiotics A 1 only B 2 only C 3 only D 1, 2 and 3

Accepted Answer

B

Question 37

37 A country has fewer than 2.5 deaths per 100 000 people from TB in one year and the next year this rose to 25 deaths per 100 000. What may have contributed to this change? 1 decrease in contact tracing 2 increase in refugee camps 3 water supply contaminated by sewage A 1 and 2 B 1 and 3 C 2 and 3 D 1, 2 and 3

Accepted Answer

A

Question 38

38 The diagram shows an arctic ecosystem. polar bear glaucous gull ringed seal little auk arctic cod squid amphipods shrimps herbivorous copepods phytoplankton sunlight How many trophic levels are represented? A 3 B 4 C 5 D 6

Accepted Answer

D

Question 39

39 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 term applies to the description of the tree? A ecosystem B habitat C niche D trophic level

Accepted Answer

C

Question 40

40 In an investigation, discs of 2.5 cm diameter were cut from leaves. Fifty discs were put into three identical bags with different net sizes and buried in newly dug soil at a depth of 3 cm. At 60 day intervals the bags were dug up and the leaf discs measured to see how much of the leaf area had disappeared. The table shows the percentage of leaf discs remaining in each bag. percentage of leaf disks remaining time / days net size 7 mm net size 0.5 mm net size 0.03 mm 0 100 100 100 60 80 94 100 120 30 81 100 180 14 67 100 240 9 63 100 300 6 61 100 Which organisms are most important for breaking down the leaves? A earthworms and beetles B microorganisms only C small invertebrates only D small invertebrates and microorganisms

Accepted Answer

A

Question paper16 pages

Mark scheme2 pages

Questions as text

Q1 · Which cell structure can be seen only with an electron microscope?

Q2 · Which is a feature of all prokaryotic cells?

Q3 · A lymphocyte has a diameter of 1 × 10–2 millimetres (mm)

Q4 · Which plan diagram of a transverse section of a leaf correctly shows the position of…

Q5 · The photomicrograph of a cell has a 2 cm scale line labelled 5 µm

Q6 · What is a function of the smooth endoplasmic reticulum?

Q7 · Which combination of bond types correctly shows the weak and strong bonds that hold a…

Q8 · Which statement is true for cellulose, but not true for protein?

Q9 · The diagram shows a triglyceride molecule that has been partially hydrolysed

Q10 · The diagram shows a tripeptide molecule

Q11 · Which combination of procedures would not be used in a food test?

Q12 · HIV-1 protease is an enzyme produced by the HIV virus

Q13 · Which features of collagen result in it having high tensile strength?

Q14 · The diagram shows a red blood cell and the concentrations of ions, in mmol dm−3, in the…

Q15 · Diagrams 1 and 2 show how the transverse section through a leaf changes when moved from…

Q16 · In an experiment, 5 cm3 of 1 % salivary amylase are added to 100 cm3 of different…

Q17 · Cystic fibrosis is a disease where Cl – ions are unable to be transported into cells

Q18 · Cancer cells divide out of control, forming tumours

Q19 · Which statement describes a cell that is capable of reproduction and belonging to a…

Q20 · During which stage of the mitotic cell cycle is DNA replicated?

Q21 · What does the enzyme DNA polymerase synthesise in a cell?

Q22 · The following statements describe events that take place during DNA replication and…

Q23 · A peptide consists of ten amino acids of four different kinds

Q24 · Which diagram shows the semi-conservative replication of a section of a molecule of DNA?

Q25 · What is the sequence of events in the translocation of assimilates?

Q26 · Which description states some of the features of xylem vessels?

Q27 · The diagram shows the changes in pressure potential (ΨP), solute potential (ΨS) and water…

Q28 · The graph shows the percentage saturation of haemoglobin with oxygen at different partial…

Q29 · When stained, which features, visible under the light microscope, are part of the cells…

Q30 · A disease damages alveoli

Q31 · An oxygen molecule diffuses directly from the air in an alveolus to haemoglobin in a red…

Q32 · What would be seen in an electron micrograph of a bronchus wall?

Q33 · Below are correct statements comparing blood, tissue fluid and lymph in a capillary bed

Q34 · After an immune response, memory cells remain in the blood for a long time

Q35 · What are produced by B-lymphocytes?

Q36 · Scientists are concerned that avian (bird) flu caused by the H5N1 virus, could infect…

Q37 · A country has fewer than 2.5 deaths per 100 000 people from TB in one year and the next…

Q38 · The diagram shows an arctic ecosystem

Q39 · A tree carries out photosynthesis and provides organic compounds for other organisms in a…

Q40 · In an investigation, discs of 2.5 cm diameter were cut from leaves

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