Complete Revision Package for Biology A & B

1 (a) Fig. 1.1 shows two cubes that represent a large and a small multicellular plant. Fig. 1.1 Large multicellular plant Small multicellular plant Length = 2cm Width = 2 cm Depth = 2cm Surface area : volume = 6:1 (i) Using the data provided in Fig. 1.1, calculate the surface area : volum...

2 OCR 2023 Section A You should spend a maximum of 20 minutes on this section. Write your answer to each question in the box provided. 1 Which description of biological molecules is correct? A DNA and RNA are both polymers of nucleotides. B Hydrolysis of sucrose produces fructose and β-gluco...

2 OCR 2023 Section A You should spend a maximum of 20 minutes on this section. Write your answer to each question in the box provided. 1 Which option correctly describes a tissue? A A group of cells performing similar functions B A group of organs performing a specific function C A group of ...

1 Cats are mammals. (a) A light micrograph of a section through the trachea of a cat is shown in Fig. 1.1. Fig. 1.1 A B C (i) Name the tissues labelled A and B in Fig. 1.1. A .........................................................................................................................

2 OCR 2023 Section A You should spend a maximum of 40 minutes on this section. Write your answer for each question in the box provided. 1 The image shows an erythrocyte after being placed in a solution. Which option explains the appearance of the erythrocyte? A The solution was distilled wate...

2 OCR 2023 1 This question is based on the Advance Notice Article ‘Development of therapeutic antibodies for the treatment of disease’. (a) (i) State what is meant by the term antigen. ............................................................................................................

Apoptosis is the programmed cell death of damaged or unwanted cells. (a) Fig. 1.1 shows a transmission electron micrograph (TEM) of apoptosis of a leucocyte. Fig. 1.1 A B C (i) Name the following structures and processes shown in Fig. 1.1: • the structure labelled A forming in the cell surf...

3 © OCR 2023 Turn over "The larger the animal, the more chromosomes it has in each body cell." 1 (a) Write these structures in order of size. Cell Chromosome Gene Nucleotide Nucleus Smallest ..................................... ..................................... ..........................

2 © OCR 2023 ring ring ring 1 Fig. 1.1 shows parts of the human nervous system. Fig. 1.1 Brain Structure B Muscle Spinal cord Structure A (a) Structure A allows us to sense the things we touch. What is the name of structure A? Put a around the correct option. CNS Effector Motor neuro...

2 © OCR 2023 1 (a) (i) Complete the table to compare cellular aerobic and anaerobic respiration in humans. Tick () the correct boxes in each row. [3] (ii) Which statement about respiration is correct? Tick () one box. Aerobic respiration produces more ATP than anaerobic respiration. Anaer...

2 © OCR 2023 Tissue B is made of unspecialized cells Meristem Tissue A transports water from the plant’s roots 1 A scientist cuts a thin slice from a plant stem, as shown in Fig. 1.1. The slice of stem contains three different tissues. Fig. 1.1 B Plant stem Tissue C (a) Draw lines ...