Protein synthesis continued: past paper questions
Real questions on protein synthesis continued
The newest 20 of 121 written questions. Open one to see it on the real paper.
- 9700/41 · October/November 2025 · Q6a(i)[3]
Explain how IUCN Red List™ assessments help to conserve biodiversity.
See it on the paper → - 9700/41 · October/November 2025 · Q6a(ii)[2]
With reference to Fig. 6.1 and the IUCN assessments for P. arion, suggest how the abundance of the butterfly differs across its distribution.
See it on the paper → - 9700/41 · October/November 2025 · Q6b(i)[2]
Use the information given to suggest why P. arion went extinct in the United Kingdom in 1979.
See it on the paper → - 9700/41 · October/November 2025 · Q6b(ii)[4]
Outline the advantages of restoring habitats for endangered species.
See it on the paper → - 9700/42 · October/November 2025 · Q8a[4]
Palm oil is the most widely used vegetable oil. It is obtained from the African oil palm, Elaeis guineensis. Oil palms are the highest yielding vegetable oil crop, needing only 10% of the land area required by other crops to produce the same quantity of oil. On the island of Borneo, tropical rainforests are cut down an...
See it on the paper → - 9700/42 · October/November 2025 · Q8b[3]
Biodiversity can be assessed at different levels. Outline the main levels at which biodiversity can be assessed.
See it on the paper → - 9700/21 · May/June 2025 · Q4a(ii)[2]
Fig. 4.1 shows that the primary transcript is modified by the addition of nucleotides to both ends of the molecule. The cap shown in Fig. 4.1 is a guanine nucleotide that is added to the 5′ end of RNA. The poly(A) tail added to the 3′ end consists of many adenine nucleotides. The cap and the tail have a function in sta...
See it on the paper → - 9700/21 · May/June 2025 · Q4a(iii)[3]
Describe the process that occurs at stage Y in Fig. 4.1.
See it on the paper → - 9700/42 · May/June 2025 · Q10b[3]
Some seal species are classified as endangered on the IUCN Red List of Threatened Species TM . Suggest ways in which seal species may be conserved. The boundaries and names shown, the designations used and the presentation of material on any maps contained in this question paper/insert do not imply official endorsement...
See it on the paper → - 9700/43 · May/June 2025 · Q4b[3]
Scientists investigated the evolutionary relationships of the squirrel family, Sciuridae. The scientists took samples from the current species in the family and carried out DNA sequencing and morphological analysis. To compare current species with species from the past: specimens from museums were used to provide the t...
See it on the paper → - 9700/43 · May/June 2025 · Q4c[1]
The estimate for the date that an ancestral species diverged into A. harrisii and A. leucurus is 3.58 million years ago. This estimate has a large uncertainty. DNA sequencing, including DNA from fossils, was used to estimate this date of divergence. Suggest a reason why there is such a large uncertainty for this date e...
See it on the paper → - 9700/52 · May/June 2025 · Q2c(ii)[3]
Use the information in Fig. 2.2 and in Fig. 2.3 to state two other conclusions about the species diversity of sponges in Algeciras Bay. Use the values in Fig. 2.3 to support your answer. The boundaries and names shown, the designations used and the presentation of material on any maps contained in this question paper/i...
See it on the paper → - 9700/42 · February/March 2025 · Q7a(i)[2]
Calculate the mean rate of decrease in the Sumatran tiger population between 1970 and 2020. mean rate of decrease = year –1
See it on the paper → - 9700/23 · October/November 2024 · Q6a[4]
A student constructed a table to compare the structural features of a plant cell, a prokaryotic cell and a virus. Complete Table 6.1. Table 6.1 plant cell prokaryotic cell virus external structure cell wall composed of cellulose cell wall composed of capsid composed of size of ribosomes 80S and 70S no ribosomes nucleic...
See it on the paper → - 9700/41 · October/November 2024 · Q9b(ii)[2]
Although a large biodiversity of lichens can be found in a range of habitats, most people ignore them. Outline why forms of life that are usually ignored, such as lichens, should be conserved.
See it on the paper → - 9700/43 · October/November 2024 · Q5a[2]
Structures A and B and the thallus of L. cruciata are haploid. Explain what is meant by haploid.
See it on the paper → - 9700/43 · October/November 2024 · Q9b(i)[3]
A student planned a method to measure the relative abundance of Usnea and Xanthoria on trees along a transect from the town centre at 0 km to unpolluted countryside at 4 km. Suggest why measuring the relative abundance of the two types of lichen gives information that is useful for conservation.
See it on the paper → - 9700/43 · October/November 2024 · Q9b(ii)[2]
Although a large biodiversity of lichens can be found in a range of habitats, most people ignore them. Outline why forms of life that are usually ignored, such as lichens, should be conserved.
See it on the paper → - 9700/51 · October/November 2024 · Q2a[2]
The ecologists decided to use two suitable indices of biodiversity: • • Simpson’s index of diversity Shannon diversity index. The ecologists had read that the two indices can lead to different conclusions. The Shannon diversity index gives values in the range 1.5–3.5, where 1.5 is low biodiversity and 3.5 is high biodi...
See it on the paper → - 9700/51 · October/November 2024 · Q2b(i)[3]
The ecologists sampled invertebrate species in peat bog A: • • • • • between 13:00 and 16:00 on three different days within a 30‑day period at 10 random sites along the edge of a path in the peat bog by sampling the invertebrates within a 1 m 2 quadrat placed at each site by using an identification key to identify the...
See it on the paper →
What examiners said
Most candidates read off the relevant values from the graph and completed the calculation accurately. Common errors included mis-reading values from the graph and dividing by an incorrect figure for the number of years.
— Examiner report, February/March 2025, 9700/42 Q7(a)(i) (Cambridge)
This question was well answered by many candidates. They needed to study the transmission electron micrograph carefully and identify the functions of structure X, the nucleolus, and structure Y, the chromatin in the nucleus. Some candidates correctly identified these structures and were unable to gain credit without accurately describing their functions. Some described the process of transcription...
— Examiner report, October/November 2023, 9700/21 Q2(a) (Cambridge)
The majority of candidates correctly identified the level of protein structure shown in Fig. 2.2 as the primary structure. The most common incorrect answer was tertiary structure.
— Examiner report, October/November 2023, 9700/21 Q2(b)(i) (Cambridge)
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