Biology 9700/41 — October/November 2015
Cambridge A-Level · A Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Selection and Evolution · Genetic Technology · Control and Coordination · Energy and Respiration · (outdated) Biotechnology · Classification, Biodiversity and Conservation · +4 more
The molecules listed below are all associated with respiration.
| ATP synthase | glucose | ATP | NAD |
| oxaloacetate | pyruvate | citrate | oxygen |
From these molecules identify:
a phosphorylated nucleotide ______
a 3-carbon compound ______
a coenzyme ______
an enzyme ______
A sample of tree sap, rich in sugars, was found to be contaminated with yeast. This sample was tested for the concentration of ethanol at regular intervals.
The results are shown in Fig. 1.1.
Calculate the percentage increase in ethanol concentration between 15 and 45 hours.
Show your working.
answer = ______
Suggest why the concentration of ethanol decreased after 45 hours.
The rest of this paper
9 more questions- Q2(outdated) Biotechnology15M
- Q3Genetic Technology · Selection and Evolution8M
- Q4Selection and Evolution · Control and Coordination · Genetic Technology16M
- Q5Classification, Biodiversity and Conservation8M
- Q6Control and Coordination8M
- Q7Photosynthesis14M
- Q8Inheritance · Selection and Evolution9M
- Q9(outdated) Aspects of Human Reproduction15M
- Q10(outdated) Crop Plants15M