OCR A Level Biology A lesson on PAG 4. Rates of Enzyme Controlled Reactions – Substrate Concentration. This is one of eight lessons to meet the specification points for 2.1.4 Enzymes. Objectives for this lesson: • Recall the effect of substrate concentration on the rate of enzyme activity. • Describe a method for investigating the effect of substrate concentration on enzyme activity. • Explain how to carry out a serial dilution, showing any calculations used. Check out my other lessons and the accompanying workbook with exam questions (and answer booklet included). Please leave a review.

OCR A Level Biology A lesson on The Effect of pH & Temperature on Enzyme Action. This is one of eight lessons to meet the specification points for 2.1.4 Enzymes. Objectives for this lesson: • Describe the effect of pH on enzyme activity. • Explain the effect of temperature on enzyme activity. • Calculate the temperature coefficient (Q10) Check out my other lessons and the accompanying workbook with exam questions (and answer booklet included). Please leave a review.

OCR A Level Biology A lesson on Theories on DNA. This is one of seven lessons to meet the specification points for 2.1.3 Nucleotides and Nucleic Acids. Objectives for this lesson: Recall the process of DNA replication. Know the importance of replication in conserving genetic information in accuracy and describe how random, spontaneous mutations can occur during replication. Evaluate experimental evidence for DNA. Check out my other lessons and the accompanying workbook with exam questions (and answer booklet included). Please leave a review.

This is the first lesson in the Edexcel Combined Biology Topic 8 on Exchange and Transport in Animals. This lesson covers Specification points 8.1, 8.2 and 8.3. There are practice questions and examples on SA:V calculations and a knowledge recall plenary with answers.

OCR A Level Biology A lesson on Structure & Function of Gas Exchange System in a Bony Fish. This is one of eight lessons to meet the specification points for 3.1.1 Exchange Surfaces. Specification points: 3.1.1 (f) Objectives for this lesson: • Describe the structure of gas exchange system in a bony fish. • Explain how ventilation works in fish. • Compare and contrast the human and fish respiratory system. Check out my other lessons and the accompanying workbook with exam questions (and answer booklet included). Please leave a review.

OCR A Level Biology A lesson on The Requirements for Specialised Exchange Surfaces and their features. This is one of eight lessons to meet the specification points for 3.1.1 Exchange Surfaces. Specification points: 3.1.1 (a) and (b) Objectives for this lesson: • Describe the features of an efficient exchange surface. • Calculate the surface area to volume ratio. • Explain the need for specialised exchange surfaces in both unicellular and multicellular organisms. Check out my other lessons and the accompanying workbook with exam questions (and answer booklet included). Please leave a review.

OCR A Level Biology A lesson on Vessel Structure. This is one of ten lessons to meet the specification points for 3.1.2 Transport in Animals. Specification points: 3.1.2 © Objectives for this lesson: • Describe the structure and function of different blood vessels. • Explain the distribution of different tissues within the vessel walls of blood vessels. • Link the structure and functions of arteries, arterioles, capillaries, venules and veins. Check out my other lessons and the accompanying workbook with exam questions (and answer booklet included). Please leave a review.

OCR A Level Biology A lesson on The Cardiac Cycle. This is one of ten lessons to meet the specification points for 3.1.2 Transport in Animals. Specification points: 3.1.2 (f) Objectives for this lesson: • State the formula for calculating cardiac output. • Describe what happens during the cardiac cycle. • Calculate the cardiac output. Check out my other lessons and the accompanying workbook with exam questions (and answer booklet included). Please leave a review.

OCR A Level Biology A lesson on Heart Dissection PAG 2. This is one of ten lessons to meet the specification points for 3.1.2 Transport in Animals. Specification points: 3.1.2 (e(ii)) Objectives for this lesson: • Recap the internal structures of the heart. • Dissect and examine the mammalian heart. • Draw the internal and external structures of the heart. Check out my other lessons and the accompanying workbook with exam questions (and answer booklet included). Please leave a review.

OCR A Level Biology A lesson on Tissue Fluid Formation and Retention. This is one of ten lessons to meet the specification points for 3.1.2 Transport in Animals. Specification points: 3.1.2 (d) Objectives for this lesson: • Recap the names of the different blood vessels. • Describe how tissue fluid is formed from plasma. • Explain the differences in the composition of blood, tissue fluid and lymph. Check out my other lessons and the accompanying workbook with exam questions (and answer booklet included). Please leave a review.

OCR A Level Biology A lesson on Colorimetry and Chromatography. This is one of the lessons to meet the specification points for 2.1.2 Biological Molecules. Objectives for this lesson: Determine the glucose concentration of an unknown solution. Use your results to create a calibration curve and determine the glucose concentration of the unknown solution. Set up paper chromatography to identify the amino acids present in the mixture. Check out my other lessons and the accompanying workbook with exam questions (and answer booklet included).

OCR A Level Biology A lesson on PAG 5 - Colorimetry. This is the required practical activities to meet the specification points for 2.1.2 Biological Molecules. Objectives for this lesson: Describe how colorimetry can be used to determine glucose concentration. Determine the glucose concentration of an unknown solution. Interpret the results of the experiment and write a conclusion. Check out my other lessons and the accompanying workbook with exam questions (and answer booklet included).

OCR A Level Biology A lesson on Types of Transport Systems. This is one of ten lessons to meet the specification points for 3.1.2 Transport in Animals. Specification points: 3.1.2 (a) and (b) Objectives for this lesson: • State the different types of circulatory systems. • Describe named examples of different types of circulatory systems. • Explain why multicellular animals need transport systems. Check out my other lessons and the accompanying workbook with exam questions (and answer booklet included). Please leave a review.