0653.B2.1.02 — Describe the structure of a bacterial cell, limited to: cell wall, cell membrane, cytoplasm, ribosomes, circular DNA, plasmids: past paper questions
Real questions on 0653.b2.1.02 — describe the structure of a bacterial cell, limited to: cell wall, cell membrane, cytoplasm, ribosomes, circular dna, plasmids
The newest 20 of 21 written questions. Open one to see it on the real paper.
- 0653/01 · Specimen 2025 · Q2[1]
Which label represents a plasmid in this diagram of a bacterium?
See it on the paper → - 0653/02 · Specimen 2025 · Q1[1]
Which label represents a plasmid in this diagram of a bacterium?
See it on the paper → - 0653/42 · October/November 2025 · Q2a(i)[2]
Circular DNA provides the code for the production of proteins in protein synthesis. On Fig. 2.1: • draw a label line to identify a structure that is the site of protein synthesis
See it on the paper → - 0653/42 · May/June 2025 · Q3c(i)[2]
Calculate how many times larger the diameter of the bacterial cell is compared to the virus. ×
See it on the paper → - 0653/62 · May/June 2025 · Q2a(i)[2]
Fig. 2.2 shows the temperature readings for this experiment. initial temperature highest temperature reached °C °C 30 50 20 40 10 30 Fig. 2.2 Record in Table 2.1, these temperatures to the nearest 0.5 °C. Table 2.1 initial temperature of aqueous copper( II ) chloride / °C highest temperature reached by reaction mixture...
See it on the paper → - 0653/62 · May/June 2025 · Q2a(ii)[1]
Calculate the temperature increase. Record this value in Table 2.1.
See it on the paper → - 0653/62 · May/June 2025 · Q2b[2]
At the end of the experiment the plastic cup contains: • • • a colourless solution a pink solid a grey solid. Explain how these observations show that the reaction has finished and that aluminium is in excess in this experiment.
See it on the paper → - 0653/62 · May/June 2025 · Q2c[2]
There is an error in the experiment that causes a smaller temperature increase than expected. Identify this error. Suggest one improvement to the experiment to minimise this error. error improvement
See it on the paper → - 0653/62 · May/June 2025 · Q2d(i)[3]
On the grid, plot temperature increase (vertical axis) against the concentration of aqueous copper( II ) chloride. (i)
See it on the paper → - 0653/62 · May/June 2025 · Q2d(ii)[1]
Draw the line of best fit.
See it on the paper → - 0653/62 · May/June 2025 · Q2e[2]
Estimate using the graph, the concentration of aqueous copper( II ) chloride that gives a temperature increase of 20.0 °C. Show your working on the graph. concentration = M
See it on the paper → - 0653/62 · May/June 2025 · Q3a[2]
Draw a voltmeter in Fig. 3.1 to show how the student measures the voltage across resistor 1 in step 2.
See it on the paper → - 0653/62 · May/June 2025 · Q3b[2]
Fig. 3.2 shows the voltmeter readings V 1 and V 2 . Read and record V 1 and V 2 to the nearest 0.01 V. 0.2 0.6 0.4 0.8 0.2 1.0 0 0.6 0.4 0.8 1.0 0 V V V 1 V 2 Fig. 3.2 V 1 = V ĬÑĊ®Ġ´íÈõÏĪÅĊàù¸þ× V 2 = V
See it on the paper → - 0653/62 · May/June 2025 · Q3c[2]
A student suggests that if resistor 1 has the same resistance as resistor 2 then V 1 = V 2 . Two values are considered equal within the limits of experimental accuracy if they are within 10% of each other. State if your values of V 1 and V 2 support the student’s suggestion. Justify your answer with a calculation.
See it on the paper → - 0653/63 · May/June 2022 · Q1g[1]
The student wants to find out if the germinating seeds make carbon dioxide. State the test to confirm the presence of carbon dioxide and give the observation for a positive result. test observation
See it on the paper → - 0653/63 · May/June 2022 · Q2a(i)[2]
Record the volume of gas collected in each experiment in cm 3 , to the nearest cm 3 . zinc powder only cm 3 zinc powder and iron powder cm 3
See it on the paper → - 0653/63 · May/June 2022 · Q2a(ii)[2]
The rate of this reaction is calculated using the equation shown. rate = volume of gas collected 20 Calculate the rate of reaction in each experiment. rate of reaction with zinc powder only = cm 3 / s rate of reaction with zinc powder and iron powder = cm 3 / s
See it on the paper → - 0653/63 · May/June 2022 · Q2a(iii)[1]
Identify which experiment has the fastest rate of reaction. Explain your answer.
See it on the paper → - 0653/63 · May/June 2022 · Q2a(iv)[1]
Suggest why the student is not able to collect all the gas made in the first 20 seconds.
See it on the paper → - 0653/63 · May/June 2022 · Q2b[1]
The student places a lighted splint into the gas made in this experiment. The gas makes a squeaky pop. Name the gas.
See it on the paper →
What examiners said
Some candidates were unable to convert the units μm or mm to a common unit to gain full credit.
— Examiner report, May/June 2025, 0653/42 Q3(c)(i) (Cambridge)
Many candidates were able to correctly write down both temperatures to the nearest 0.5 °C. Common errors included omitting the .0 from the second reading or rounding up the first reading to 22 °C.
— Examiner report, May/June 2025, 0653/62 Q2(a)(i) (Cambridge)
Most candidates were able to calculate the difference between the two readings.
— Examiner report, May/June 2025, 0653/62 Q2(a)(ii) (Cambridge)
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