Match mechanisms, quantities and units
Review cell function, energy flow, concentration and work.
The idea
Ribosomes assemble proteins. Energy transferred through food chains is not fully converted into new biomass. Concentration and work are defined relationships with specific units.
A method to try
- Connect a biological structure to its function.
- Write amount/volume for concentration and force×distance for aligned constant-force work.
Follow the reasoning.
A constant force of 8 N acts along a displacement of 5 m. Calculate the work done by that force.
- For an aligned constant force, work equals force times displacement: 8 × 5 = 40 J.
- The unit newton metre is equivalent to the joule for work. If the force were perpendicular to the displacement, its work would instead be zero.
- This difference shows why the direction condition matters. State the relation and its assumptions before using the numbers, rather than selecting a formula solely because it contains the units given.
Think it through first.
Where does a cell translate an mRNA sequence into a polypeptide?
Show the explanation
At a ribosome.
Ribosomes assemble amino acids according to the mRNA sequence; later processing can occur elsewhere.
Make it your own
After reading, explain the method in your own words and identify the condition that makes it valid. Then try the linked starter practice without referring back to the worked example. Review the reasoning behind an error before repeating the same item; remembering an answer is different from being able to solve a new problem.
This lesson is one part of a short starter pathway. It does not cover the full exam syllabus or establish a predicted score.
Official references
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- CISIA: CEnT-S structure and syllabus (opens in a new tab)Checked 2026-09-20
- CISIA: CEnT rules (opens in a new tab)Checked 2026-09-20
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- Chemistry 2e: Classifying Chemical Reactions (opens in a new tab)Checked 2026-09-20
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- College Physics 2e: Motion Equations for Constant Acceleration in One Dimension (opens in a new tab)Checked 2026-09-20
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- ABO Blood Group — Medical Genetics Summaries (opens in a new tab)Checked 2026-09-20
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