T Level Health: Biological Molecules, Enzymes and Membranes

This material covers the core science concepts that sit underneath the body-systems content of the T Level in Health: cells, the large molecules of the body, enzymes, membranes and genetic material. In the specification used for students starting from September 2026, these topics belong to the science paper, one of the two written exams that, with an employer-set project, make up the core assessment. It goes further than a first look at cells, towards the Level 3 depth the qualification expects.

You start with the three principles of cell theory and the difference between prokaryotic and eukaryotic cells, then work with the organelles that make and process proteins: ribosomes on the rough endoplasmic reticulum, the Golgi apparatus that modifies and packages proteins, and lysosomes that digest worn-out parts of the cell. Proteins are covered through their four levels of structure, with haemoglobin as the example of quaternary structure, and through deamination of excess amino acids in the liver. Carbohydrates and lipids are compared: glucose and glycogen, triglycerides and phospholipids, and the uses of each in the body.

The enzyme questions explain the active site, the enzyme-substrate complex and activation energy, and why a change in pH, such as pepsin moving from the stomach to the duodenum, stops an enzyme from working. The membrane questions use the fluid mosaic model to explain diffusion, facilitated diffusion, osmosis and active transport, including what happens to red blood cells placed in pure water. A surface-area-to-volume calculation shows why a large body needs exchange surfaces and a transport system. The last topic compares DNA with RNA.

The quiz mixes knowledge questions with short applied items set in invented laboratories and hospitals, and one calculation. The flashcards hold the key terms. The written work has eight longer tasks, such as following a secreted protein through the cell or explaining how oxygen, glucose and water cross a membrane, marked against key points. The exam is a conversation with an examiner who asks you to explain one concept at a time and gives brief feedback at the end.

The questions are original practice material and do not predict what a particular exam will ask.

• State the principles of cell theory and compare prokaryotic and eukaryotic cells
• Explain how proteins are made, processed and secreted, and describe the four levels of protein structure
• Compare the structure and uses of carbohydrates and lipids, including triglycerides and phospholipids
• Explain how enzymes lower activation energy and why pH changes affect the active site
• Explain membrane transport using the fluid mosaic model, calculate surface-area-to-volume ratios and compare DNA with RNA

Practice material written by Zestly, based on the core content of the Pearson T Level Technical Qualification in Health specification (Version 1.2, July 2026, for students starting from September 2026), content area 8 (Core science concepts), sections 8.1 to 8.8. Not endorsed by Pearson or the Department for Education.