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Practise

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Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

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2730 questions · page 100 of 137 · choose a topic above to narrow them down

SA-AB-PM-0052 marksL2 StandardCalculatorTensile strength

A fibre breaks when 0.60 kg is added. Calculate the breaking force (N), with g = 9.8 N kg⁻¹.

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SA-AB-PR-0021 markL2 StandardCalculatorTechniques

1.0 mol dm⁻³ glucose is diluted ×10 four times. What is the final concentration (×10⁻⁴ mol dm⁻³)?

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SA-AB-PR-0032 marksL2 StandardCalculatorTechniques

What volume (cm³) of 2.0 mol dm⁻³ sucrose is needed to make 50 cm³ of 0.40 mol dm⁻³?

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SA-AB-PR-0041 markL2 StandardCalculatorCore practicals

In the osmosis practical, the water potential of the tissue equals that of the solution where

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SA-AB-PR-0051 markL2 StandardCalculatorTechniques

A calibration curve is used in colorimetry to

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SA-AB-PS-0021 markL2 StandardCalculatorGenetic code

The genetic code is degenerate, meaning

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SA-AB-PS-0031 markL2 StandardCalculatorProcess

Transcription is carried out by

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SA-AB-PS-0041 markL2 StandardCalculatorProcess

Splicing removes

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SA-AB-PS-0051 markL2 StandardCalculatorGenetic code

DNA template triplet TAC gives the mRNA codon

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SA-AB-PT-0021 markL2 StandardCalculatorXylem

Water is pulled up the xylem mainly by

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SA-AB-PT-0031 markL2 StandardCalculatorXylem

The Casparian strip

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SA-AB-PT-0051 markL2 StandardCalculatorTranspiration

Transpiration rate decreases when

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SA-AB-PW-0021 markL2 StandardCalculatorProtein structure

α-helices are held by

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SA-AB-PW-0031 markL2 StandardCalculatorProtein structure

Which bond in tertiary structure is covalent?

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SA-AB-PW-0041 markL2 StandardCalculatorProtein structure

How many different tripeptides could be made from 20 amino acids?

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SA-AB-PW-0051 markL2 StandardCalculatorHaemoglobin and collagen

Haemoglobin has quaternary structure because it

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SA-AB-SE-0012 marksL2 StandardCalculatorHardy–Weinberg

In a population, 4% show a recessive phenotype. Calculate the frequency of the recessive allele.

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SA-AB-SE-0031 markL2 StandardCalculatorVariation

Human height shows

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SA-AB-SE-0041 markL2 StandardCalculatorSelection types

Selection favouring individuals at one extreme is

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SA-AB-SE-0051 markL2 StandardCalculatorSelection types

Stabilising selection

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