Cambridge A Level Biology 9700 — 2014 May/June Paper 1 · Variant 1

Question 1

1 What best describes an electron microscope in comparison with a light microscope? magnification resolution A higher higher B higher lower C lower higher D lower lower

Accepted Answer

A

Question 2

2 Where would cisternae be found in a cell? 1 endoplasmic reticulum 2 Golgi apparatus 3 mitochondrion A 1 and 2 B 1 and 3 C 2 and 3 D 1 only

Accepted Answer

A

Question 3

3 Which adaptation would increase 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 4

4 What is the order of size of cell structures? largest smallest A centrioles ribosomes lysosomes nucleoli B lysosomes nucleoli centrioles ribosomes C nucleoli lysosomes centrioles ribosomes D nucleoli centrioles ribosomes lysosomes

Accepted Answer

C

Question 5

5 The diagram shows some similarities between chloroplasts, mitochondria and typical prokaryotes. 1 2 3 4 5 Which row is correct? 1 2 3 4 5 A chloroplasts circular DNA mitochondria 80S ribosomes prokaryotes B chloroplasts 80S ribosomes mitochondria circular DNA prokaryotes C prokaryotes circular DNA mitochondria circular DNA chloroplasts D prokaryotes 70S ribosomes chloroplasts 80S ribosomes mitochondria

Accepted Answer

C

Question 6

6 A student carried out four tests for biological molecules on a solution. The results are shown in the table. test for biological observation molecules iodine solution orange-brown biuret purple Benedict’s orange emulsion clear Which three molecules may be present in this solution? A glucose, starch, globin B globin, glucose, collagen C starch, sucrose, collagen D sucrose, globin, collagen

Accepted Answer

B

Question 7

7 The molecule shown is a polymer of reducing sugars. CH2OH CH2OH CH2OH CH2OH O O O O OH OH OH OH O O O HO OH OH OH OH OH Which procedures could be carried out in order to test for the presence of the reducing sugars in this molecule? 1 Add hydrolytic enzyme and then heat with Benedict’s reagent. 2 Dissolve in water, neutralise and then heat with Benedict’s reagent. 3 Boil with hydrochloric acid, neutralise and then heat with Benedict’s reagent. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Accepted Answer

C

Question 8

8 Which molecules show the structure of α-glucose and of β-glucose? α-glucose β-glucose CH2OH CH2OH O OH O A OH OH HO HO OH OH OH CH2OH CH2OH O O OH B OH OH OH HO OH HO OH CH2OH CH2OH O O OH C OH OH HO OH HO OH OH CH2OH CH2OH O OH O D OH OH OH HO HO OH OH

Accepted Answer

C

Question 9

9 In unsaturated lipid molecules, where are double bonds located? A between fatty acids and glycerol B within fatty acids and within glycerol C within fatty acids only D within glycerol only

Accepted Answer

C

Question 10

10 The diagram shows the structure of four amino acids in solution. COO– COO– H C H3N+ CH2 CH2 CH2 CH2 C N+H3 N+H3 H H glycine lysine COO– O COO– CH3 C C CH2 C N+H3 O– N+H3 H H alanine aspartate Which of these four amino acids have an overall charge? A alanine and aspartate B alanine and glycine C aspartate and lysine D glycine and lysine

Accepted Answer

C

Question 11

11 Which level of organisation of a haemoglobin molecule is coded by a DNA molecule? A primary structure B secondary structure C tertiary structure D quaternary structure

Accepted Answer

A

Question 12

12 The statements are about enzymes. 1 They are globular proteins. 2 They are formed in the smooth endoplasmic reticulum. 3 They are only found attached to plasma membranes in the cell. 4 They can be inhibited by competitive inhibitors. Which statements are correct for all enzymes? A 1 and 4 only B 2 and 4 only C 1, 2 and 3 only D 1, 2, 3 and 4

Accepted Answer

A

Question 13

13 An unusual enzyme has been found in a tropical grass. • It catalyses the hydrolysis of the fungal polysaccharide, chitin, into amino sugars. • It also inhibits the activity of an enzyme in locust guts which catalyses the digestion of amylose. What describes the actions of this unusual enzyme? reaction catalysed reaction inhibited A hydrolysis of glycosidic bonds condensation of glycosidic bonds B hydrolysis of glycosidic bonds hydrolysis of glycosidic bonds C hydrolysis of peptide bonds condensation of glycosidic bonds D hydrolysis of peptide bonds hydrolysis of glycosidic bonds

Accepted Answer

B

Question 14

14 The fluidity of the cell surface membrane can be changed by a number of factors. As the fluidity of cell surface membranes decreases, which process would be least changed? A active transport B diffusion C endocytosis D osmosis

Accepted Answer

A

Question 15

15 Which molecules in cell surface membranes contribute to cell recognition? A cholesterol, glycolipids, phospholipids B cholesterol, phospholipids, proteins C glycolipids, glycoproteins, proteins D phospholipids, glycoproteins, proteins

Accepted Answer

C

Question 16

16 Which is correct for facilitated diffusion and active transport? A both depend on the solubility of the transported molecule in the lipid bilayer B both increase as the concentration of the transported molecule increases C both require the use of ATP D both require the use of membrane proteins

Accepted Answer

D

Question 17

17 Which features increase the efficiency of ion uptake by a root hair cell? 1 many mitochondria in the cell 2 high concentration of ions in the vacuole 3 protein carriers in the cell surface membrane A 1, 2 and 3 B 1 and 3 only C 2 and 3 only D 1 only

Accepted Answer

B

Question 18

18 Which processes occur by mitosis? 1 cloning of plasma cells 2 gamete production 3 replacing damaged cells A 1, 2 and 3 B 1 and 3 only C 2 only D 3 only

Accepted Answer

B

Question 19

19 The diagram shows crosses between wild wheat and two types of grass. wild wheat × goat grass 2n = 14 2n = 14 sterile hybrid mutation doubles chromosome number fertile hybrid 1 × another grass 2n = 14 sterile hybrid mutation doubles chromosome number fertile hybrid 2 What is the chromosome number of the fertile hybrid 2? A 28 B 42 C 56 D 140

Accepted Answer

B

Question 20

20 The diagram shows a human cell (2n = 46) at the end of prophase of mitosis (cell 1) and the daughter cells just after telophase (cells 2 and 3). cell 1 cell 2 cell 3 How many DNA molecules are there in the nucleus of cell 1 and cell 2? cell 1 cell 2 A 46 23 B 46 46 C 92 23 D 92 46

Accepted Answer

D

Question 21

21 Which diagram represents a correct base pair of DNA? A B P A T P P C G P C D P C G P P A T P

Accepted Answer

B

Question 22

22 Part of the amino acid sequences in normal and sickle cell haemoglobin are shown. normal haemoglobin sickle cell haemoglobin thr-pro-glu-glu thr-pro-val-glu Possible mRNA codons for these amino acids are shown below. glutamine (glu) GAA GAG proline (pro) CCU CCC threonine (thr) ACU ACC valine (val) GUA GUG Which tRNA molecule is not involved in the formation of this part of the sickle cell haemoglobin? A B C D C U C U U A U C A U G G

Accepted Answer

D

Question 23

23 Two sets of bacteria were grown using different types of nitrogen-containing growth media. One set was grown in a medium containing the ‘heavy’ isotope of nitrogen, 15N, until all the DNA was labelled. The other set were grown in a medium containing the ‘light’ isotope of nitrogen, 14N, until all the DNA was labelled. The DNA from each set of bacteria was extracted and centrifuged. The diagram shows the position in the centrifuge tubes of this DNA. DNA with 14N DNA with 15N Bacteria with 15N labelled DNA were transferred to a medium containing 14N and allowed to reproduce once. The DNA of the new generation of bacteria was extracted and centrifuged. Which tube shows the position of DNA from this new generation of bacteria? A B C D

Accepted Answer

D

Question 24

24 Which processes are involved in transpiration? 1 the diffusion of water vapour from stomata 2 the mass flow of water through the xylem 3 the evaporation of water from the surface of mesophyll cells 4 the evaporation of water vapour from air spaces A 1, 2 and 3 B 2, 3 and 4 C 1 and 3 only D 1 and 4

Accepted Answer

A

Question 25

25 The photomicrograph shows a vascular bundle from the stem of a plant. Y Z X What are the correct labels for structures X, Y and Z? X Y Z A companion cell sieve tube element air space B sieve tube element xylem vessel element air space C xylem vessel element companion cell sieve tube element D xylem vessel element sieve tube element companion cell

Accepted Answer

B

Question 26

26 The graph shows the results of using a potometer to measure the effect of wind speed on the rate of water loss in a plant. 30 25 20 rate of 15 water loss / cm3 hr–1 10 5 0 0 10 20 30 40 wind speed / km hr–1 Which statement explains the results obtained from the investigation? A As wind speed increases, it becomes harder for the plant to obtain carbon dioxide. At high wind speeds the stomata are fully open so rate of water loss is high. B As wind speed increases, moist air around the stomata is removed and replaced by dry air. At high wind speeds the transpiration rate is lower. C As wind speed increases, the rate of water loss increases due to an increased diffusion gradient. At high wind speeds, the stomata close. D As wind speed increases, transpiration rate and rate of photosynthesis increases. At high wind speeds more water is used for photosynthesis.

Accepted Answer

C

Question 27

27 Land flooded by the sea is not suitable for growing plants after the salty flood water has drained away. Which values of water potential in the xylem and soil water help to explain why the land flooded with salty water is unsuitable for growth of plants? water potential / kPa xylem soil water A –1800 –700 B –700 –1800 C –700 –300 D 0 –1800

Accepted Answer

B

Question 28

28 What is the role of ATP in a companion cell when sucrose is loaded into a sieve tube element? A moving sucrose into the sieve tube element B removing protons out of the cytoplasm of the companion cell C removing protons from the sieve tube element D taking up sucrose into the cytoplasm of the companion cell

Accepted Answer

B

Question 29

29 Which features allow an artery to resist changes in the pressure of blood flowing through it? 1 smooth endothelium 2 thick elastic layer in the artery wall 3 thick layer of muscle in the artery wall A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Accepted Answer

D

Question 30

30 Which reactions will be taking place in blood in a capillary next to an alveolus? 1 Hb  +  4O2  →  HbO8 2 H2O  +  CO2  →  H2CO3 3 HHb  +  4O2  →  HbO8  +  H+ A 1 only B 2 only C 1 and 2 D 2 and 3

Accepted Answer

A

Question 31

31 The photomicrograph shows a section through two structures found in mammals viewed using a light microscope. X W ×40 Which row is correct? W X feature A artery vein X contains cells with haemoglobinic acid B bronchiole vein X contains cells with oxyhaemoglobin C trachea artery the lumen of W allows air to pass through D vein atrium W contains deoxygenated blood

Accepted Answer

A

Question 32

32 Which cells or tissues are not correctly paired with their function? cells / tissues function A cartilage supports the trachea B ciliated epithelial cells move mucus over the surface of the trachea C goblet cells produce enzymes to destroy bacteria D smooth muscle constriction of some of the bronchioles

Accepted Answer

C

Question 33

33 Which could lead to chronic bronchitis? A deposition of allergens in airways causing smooth muscles to contract B excessive secretion and accumulation of mucus and destruction of many cilia in the airways C infection of airways leading to phagocytes destroying the elastin in the alveoli D mutation in epithelial cells in airways caused by inhaled chemicals

Accepted Answer

B

Question 34

34 What is the minimum number of cell membranes a molecule of carbon dioxide and a molecule of oxygen pass through during gas exchange between alveoli and the capillaries? carbon dioxide oxygen A 2 4 B 3 5 C 4 5 D 4 4

Accepted Answer

D

Question 35

35 The statements refer to the disease tuberculosis (TB). 1 The pathogen lives inside human cells so is not accessible to the immune system. 2 The bacterial pathogen reproduces slowly. 3 The pathogen is not very sensitive to antibiotics. Which explains why antibiotic treatment for TB takes a long time? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Accepted Answer

D

Question 36

36 The first column in the table contains statements about disease. Columns headed 1-4 represent

four different named diseases.

disease
statement about disease 1 2 3
infectious disease v v
can be treated with antibiotics v
caused by a bacterium v
degeneration of lung tissue v

Which is the correct set of column headings for the diseases in the table?

disease

0 0O DW >

bronchitis
emphysema
emphysema

lung cancer

measles
malaria

smallpox

malaria
HIV/AIDS
cholera

HIV/AIDS

smallpox

cholera

HIV/AIDS

cholera

key

/ =true

Accepted Answer

C

Question 37

37 The following events occur when a phagocyte responds to the presence of a pathogen. 1 endocytosis 2 enzymic digestion 3 exocytosis 4 phagocytosis 5 vacuole formation Which is the correct sequence of events? first last A 1 5 2 3 B 3 2 5 1 C 4 2 5 3 D 4 5 2 1

Accepted Answer

A

Question 38

38 Which type of immunity occurs as a result of the ingestion of antibodies by an infant through its mother’s milk? artificial natural active A B passive C D

Accepted Answer

D

Question 39

39 An insect lives in and feeds on the tissue of oak tree leaves and is eaten by birds.

Which ecological terms are described in this information about the insect?

habitat niche trophic level
A v v v
B v v x
Cc x v v
D x x v

key
/ =can be described

X =cannot be described

Accepted Answer

A

Question 40

40 A farmer grows a different crop in a field each year for three years. In the fourth year the farmer plants a leguminous crop and then ploughs this into the soil. The next year the rotation starts again. Which microorganisms will increase by the time the rotation starts again? 1 denitrifying bacteria 2 nitrifying bacteria 3 nitrogen-fixing bacteria 4 decomposing bacteria A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4

Accepted Answer

D

Question paper20 pages

Mark scheme2 pages

Questions as text

Q1 · What best describes an electron microscope in comparison with a light microscope?

Q2 · Where would cisternae be found in a cell?

Q3 · Which adaptation would increase active transport of carbohydrates from a plant cell?

Q4 · What is the order of size of cell structures?

Q5 · The diagram shows some similarities between chloroplasts, mitochondria and typical…

Q6 · A student carried out four tests for biological molecules on a solution

Q7 · The molecule shown is a polymer of reducing sugars

Q8 · Which molecules show the structure of α-glucose and of β-glucose?

Q9 · In unsaturated lipid molecules, where are double bonds located?

Q10 · The diagram shows the structure of four amino acids in solution

Q11 · Which level of organisation of a haemoglobin molecule is coded by a DNA molecule?

Q12 · The statements are about enzymes

Q13 · An unusual enzyme has been found in a tropical grass

Q14 · The fluidity of the cell surface membrane can be changed by a number of factors

Q15 · Which molecules in cell surface membranes contribute to cell recognition?

Q16 · Which is correct for facilitated diffusion and active transport?

Q17 · Which features increase the efficiency of ion uptake by a root hair cell?

Q18 · Which processes occur by mitosis?

Q19 · The diagram shows crosses between wild wheat and two types of grass

Q20 · The diagram shows a human cell (2n = 46) at the end of prophase of mitosis (cell 1) and…

Q21 · Which diagram represents a correct base pair of DNA?

Q22 · Part of the amino acid sequences in normal and sickle cell haemoglobin are shown

Q23 · Two sets of bacteria were grown using different types of nitrogen-containing growth media

Q24 · Which processes are involved in transpiration?

Q25 · The photomicrograph shows a vascular bundle from the stem of a plant

Q26 · The graph shows the results of using a potometer to measure the effect of wind speed on…

Q27 · Land flooded by the sea is not suitable for growing plants after the salty flood water…

Q28 · What is the role of ATP in a companion cell when sucrose is loaded into a sieve tube…

Q29 · Which features allow an artery to resist changes in the pressure of blood flowing through…

Q30 · Which reactions will be taking place in blood in a capillary next to an alveolus?

Q31 · The photomicrograph shows a section through two structures found in mammals viewed using…

Q32 · Which cells or tissues are not correctly paired with their function?

Q33 · Which could lead to chronic bronchitis?

Q34 · What is the minimum number of cell membranes a molecule of carbon dioxide and a molecule…

Q35 · The statements refer to the disease tuberculosis (TB)

Q36 · The first column in the table contains statements about disease

Q37 · The following events occur when a phagocyte responds to the presence of a pathogen

Q38 · Which type of immunity occurs as a result of the ingestion of antibodies by an infant…

Q39 · An insect lives in and feeds on the tissue of oak tree leaves and is eaten by birds

Q40 · A farmer grows a different crop in a field each year for three years

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