es' as **False** B1","marks":3,"order":0,"markingRubric":null,"explanation":{"methods":[{"id":"true_false_rna","label":"Classify RNA statements","steps":[{"type":"text","order":0,"title":"Mark the first two","content":"RNA is typically **single-stranded**, and it contains the sugar **ribose** instead of deoxyribose. Therefore, tick **True** for both of these statements. These two correct ticks earn the first B1 mark."},{"type":"text","order":1,"title":"Check the RNA base","content":"RNA uses **uracil (U)** where DNA uses thymine (T). Therefore, tick **True** for this statement. This correct tick earns the second B1 mark."},{"type":"text","order":2,"title":"Classify the false statements","content":"RNA is not a polymer made of amino acids: RNA is a nucleic acid polymer made from nucleotides. RNA molecules are generally shorter than DNA molecules, not longer. Therefore, tick **False** for both statements. These two false ticks earn the final B1 mark."}]}],"generatedAt":"2026-07-22T11:10:19.395Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]},{"id":"88955fd4-7ab2-4707-a61d-55dc801bedc7","label":"b","content":"Draw lines to connect the **cell type** to its **cell wall characteristic**, and then to the **presence of chloroplasts**.\n\n* **Cell type**:\n * plant cell\n * animal cell\n* **Cell wall characteristic**:\n * cellulose cell wall\n * no cell wall\n* **Presence of chloroplasts**:\n * chloroplasts present\n * no chloroplasts","markscheme":"- Correctly links: plant cell $\\rightarrow$ cellulose cell wall $\\rightarrow$ chloroplasts present B1\n- Correctly links: animal cell $\\rightarrow$ no cell wall $\\rightarrow$ no chloroplasts B1","marks":2,"order":1,"markingRubric":null,"explanation":{"methods":[{"id":"match_cell_features","label":"Match the cell features","steps":[{"type":"text","order":1,"title":"Match the plant cell","content":"A plant cell has a **cellulose cell wall**, which is a firm outer layer made from cellulose. Plant cells also have **chloroplasts**, where photosynthesis takes place.\n\nDraw the first chain:\n\n$$\\text{plant cell} \\rightarrow \\text{cellulose cell wall} \\rightarrow \\text{chloroplasts present}$$\n\nThis complete correct chain earns **B1**.","highlights":[{"text":"plant cell","location":"specification"},{"text":"cellulose cell wall","location":"specification"},{"text":"chloroplasts present","location":"specification"}]},{"type":"text","order":2,"title":"Match the animal cell","content":"Animal cells do **not** have a cell wall and do **not** have chloroplasts. They do not photosynthesise, so chloroplasts are not needed.\n\nDraw the second chain:\n\n$$\\text{animal cell} \\rightarrow \\text{no cell wall} \\rightarrow \\text{no chloroplasts}$$\n\nThis complete correct chain earns the second **B1**.","highlights":[{"text":"animal cell","location":"specification"},{"text":"no cell wall","location":"specification"},{"text":"no chloroplasts","location":"specification"}]}]}],"generatedAt":"2026-07-22T11:13:12.913Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]},{"id":"31694325-2bc0-410a-b5c4-c06e6cd4fb7c","label":"c","content":"Complete these sentences about preparing and viewing specimens under a light microscope.\n\nChoose words from the list:\ncover slip**, **eyepiece**, **high power**, **light source**, **stage**, **stain\n\n(i) To make transparent cell structures visible, a chemical called a \\text{...........................} is added to the specimen.\n\n(ii) The specimen on the slide is covered gently with a thin piece of glass called a \\text{...........................}.\n\n(iii) The lens at the top of the microscope that you look directly through is called the \\text{...........................} lens.","markscheme":"- (i) Identifies the chemical as a **stain** B1\n- (ii) Identifies the thin piece of glass as a **cover slip** B1\n- (iii) Identifies the lens as the **eyepiece** lens B1","marks":3,"order":2,"markingRubri

Cell structures

Question 16

Cell structures Questions

Cell structures

Question 16

Cell structures Questions