← Back to full paperPrevious questionNext question

Question 8

From Biology SL Paper 3 (November 2024, TZ2)

Grade your answerAnswer this question in practice mode and submit it for feedback.Practice under timed constraintsOpen the paper flow with timed full-exam navigation.
View source PDF page 2
  1. Batch anaerobic fermentation experiments were performed to investigate the hydrolysis of cellulose into reducing sugars by bacteria and fungi found in the stomach of goats. The graph shows the results obtained at a range of pH values from 5.3 to 7.3.
This graph displays the cellulose concentration (g dm^-3) over time (hours) for different pH values (7.3, 6.8, 5.8, 5.3). It is the primary stimulus for question 8.
This graph displays the cellulose concentration (g dm^-3) over time (hours) for different pH values (7.3, 6.8, 5.8, 5.3). It is the primary stimulus for question 8.

(a) Suggest conclusions that the investigators drew from this data about the effect of pH on the cellulose hydrolysis rate. [2]

(b) Suggest one advantage of using microorganisms in this type of fermentation. [1]

(c) Distinguish between batch and continuous fermentation. [1]

Textbook topics in this question

Review the exact course sections assessed by each question part.

Mixed-topic question
8(a)2.1 Enzymes and Metabolic PathwaysIndustrial fermentation · legacy topic
8(b)5.2 Prokaryotic Cell StructureIndustrial fermentation · legacy topic
8(c)Batch and continuous fermentation · legacy topic