Biotechnology — Paper 2 · IGCSE Biology (9-1) 0970

17 A student places two samples of crushed apple into two beakers, P and Q. The samples are of equal size. She adds 5 cm3 of pectinase solution to beaker P and 5 cm3 of water to beaker Q. After five minutes, she places the samples of crushed apple into two different filter funnels, and measures the volume of juice filtering through from each sample over a period of 10 minutes. Which graph shows her results? A B Q P total volume total volume of juice filtered P of juice filtered through through Q 00 00 time time C D P Q total volume total volume of juice filtered of juice filtered Q through P through 00 00 time time

1 marks

Answer: B

This question in 0970/21 May/June 2018

38 What does Penicillium need to grow in a fermenter? amino acids | carbohydrates oxygen v v v 0 0O WwW > v v x v x v x v v

1 marks

Answer: A

This question in 0970/21 May/June 2018

37 The diagram shows an industrial fermenter used to produce penicillin. X What is a function of the part labelled X? A add oxygen to the solution B maintain an even temperature throughout the solution C record the pH of the solution D sterilise the solution

1 marks

Answer: B

This question in 0970/22 Oct/Nov 2018

37 What is the role of anaerobic respiration in bread-making? A to produce alcohol to flavour the bread B to produce gas to make the bread rise C to release enough energy to bake the bread D to release enough lactic acid to kill the yeast

1 marks

Answer: B

This question in 0970/21 May/June 2020

39 Which is a reason for using bacteria in biotechnology? A Bacteria are found inside the human body. B Bacteria do not become resistant to antibiotics. C Bacteria can make complex molecules. D Bacteria reproduce slowly.

1 marks

Answer: C

This question in 0970/22 May/June 2020

38 What is the useful product of anaerobic respiration in the manufacture of bread? A carbon dioxide B ethanol C lactic acid D oxygen

1 marks

Answer: A

This question in 0970/22 Oct/Nov 2021

37 The graph shows how much penicillin is produced by the fungus Penicillium in a fermenter. It also shows the concentrations of sugars, ammonium ions and Penicillium. Penicillium uses sugars as a food source and needs ammonium ions. penicillin sugars concentration Penicillium ammonium ions time What does the graph show about the conditions needed for penicillin production? A A high concentration of ammonium ions must be maintained. B Most penicillin is produced when nutrient concentrations are low. C Penicillium cannot produce penicillin when its concentration decreases. D Sugars must be added constantly to the fermenter.

1 marks

Answer: B

This question in 0970/22 Oct/Nov 2022

40 Yeast carries out anaerobic respiration, making carbon dioxide and ethanol as end-products. Which end-products can be used to make biofuel and bread? biofuel bread A carbon dioxide carbon dioxide B carbon dioxide ethanol C ethanol carbon dioxide D ethanol ethanol

1 marks

Answer: C

This question in 0970/22 May/June 2023

23 Yeast cells can convert glucose into alcohol and carbon dioxide. Which statement about this process is correct? A The alcohol produced can be used to make bread rise. B The carbon dioxide produced can be burnt as a biofuel. C The yeast cells are using oxygen for this process. D The yeast cells are carrying out anaerobic respiration.

1 marks

Answer: D

This question in 0970/22 Oct/Nov 2023

40 The diagram shows some apparatus that was used to produce lactose-free milk. milk alginate beads containing X milk containing Y The alginate beads do not react with any of the substances. X is an enzyme that catalyses a reaction involving one of the substances found in milk. What are X and Y? X Y A amylase glucose B amylase starch C lactase glucose D lactase starch

1 marks

Answer: C

This question in 0970/22 Oct/Nov 2024

40 Which features make bacteria useful in biotechnology? 1 They are unaffected by antibiotics. 2 They do not contain plasmids. 3 They make complex molecules. 4 They reproduce rapidly. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: D

This question in 0970/22 May/June 2025