Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.33B - Practical: Investigate the energy content in a food sample. Complete set of Chapter 2 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.48 - Explain how alveoli are adapted for gas exchange by diffusion between air in the lungs and blood in capillaries. Specification Point 2.49 - Understand the biological consequences of smoking in relation to the lungs and the circulatory system, including coronary heart disease. Specification Point 2.50 - Practical: Investigate breathing in humans, including the release of carbon dioxide and the effect of exercise. Complete set of Chapter 3 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.83 - Understand that plants respond to stimuli. Specification Point 2.84 - Describe the geotropic and phototropic responses of roots and stems. Specification Point 2.85 - Understand the role of auxin in the phototropic response of stems. Complete set of Chapter 4 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.63B - Understand how vaccination results in the manufacture of memory cells, which enable future antibody production to the pathogen to occur sooner, faster and in greater quantity. Complete set of Chapter 3 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.70 - Understand the origin of carbon dioxide and oxygen as waste products of metabolism and their loss from the stomata of a leaf. Specification Point 2.71 - Know the excretory products of the lungs, kidneys and skin. Complete set of Chapter 4 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.80 - Understand how organisms are able to respond to changes in their environment. Specification Point 2.81 - Understand that homeostasis is the maintenance of a constant internal environment, and that body water content and body temperature are both examples of homeostasis. Specification Point 2.82 - Understand that a coordinated response requires a stimulus, a receptor and an effector. Complete set of Chapter 4 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 3.38 - Explain Darwin’s theory of evolution by natural selection. Specification Point 3.39 - Understand how resistance to antibiotics can increase in bacterial populations, and appreciate how such an increase can lead to infections being difficult to control. Complete set of Chapter 5 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 4.6 - Understand the names given to different trophic levels, including producers, primary, secondary and tertiary consumers and decomposers. Specification Point 4.7 - Understand the concepts of food chains, food webs, pyramids of number, pyramids of biomass and pyramids of energy transfer. Specification Point 4.8 - Understand the transfer of substances and energy along a food chain. Specification Point 4.9 - Understand why only about 10% of energy is transferred from one trophic level to the next. Complete set of Chapter 6 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 5.10 - Understand how selective breeding can develop plants with desired characteristics. Specification Point 5.11 - Understand how selective breeding can develop animals with desired characteristics. Complete set of Chapter 7 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.93 - Describe the role of the skin in temperature regulation, with reference to sweating, vasoconstriction and vasodilation. Complete set of Chapter 4 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 3.1 - Understand the differences between sexual and asexual reproduction. Specification Point 3.2 - Understand that fertilization involves the fusion of a male and female gamete to produce a zygote that undergoes cell division and develops into an embryo. Complete set of Chapter 5 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.94 - Understand the sources, roles and effects of the following hormones: adrenaline, insulin, testosterone, progesterone and oestrogen. Complete set of Chapter 4 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.95B - Understand the sources, roles and effects of the following hormones: ADH, FSH and LH. Complete set of Chapter 4 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 3.11 - Describe the role of the placenta in the nutrition of the developing embryo. Specification Point 3.12 - Understand how the developing embryo is protected by amniotic fluid. Specification Point 3.13 - Understand the roles of oestrogen and testosterone in the development of secondary sexual characteristics. Complete set of Chapter 5 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 3.16B - Describe a DNA molecule as two strands coiled to form a double helix, the strands being linked by a series of paired bases: adenine (A) with thymine (T), and cytosine © with guanine (G). Specification Point 3.17B - Understand that an RNA molecule is single stranded and contains uracil (U) instead of thymine (T). Specification Point 3.18B - Describe the stages of protein synthesis including transcription and translation, including the role of mRNA, ribosomes, tRNA, codons and anticodons. Complete set of Chapter 5 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 3.19 - Understand how genes exist in alternative forms called alleles which give rise to differences in inherited characteristics. Specification Point 3.20 - Understand the meaning of the terms: dominant, recessive, homozygous, heterozygous, phenotype, and genotype. Specification Point 3.21B - Understand the meaning of the term codominance. Complete set of Chapter 5 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.21 - Describe the structure of the leaf and explain how it is adapted for photosynthesis. Specification Point 2.22 - Understand that plants require mineral ions for growth, and that magnesium ions are needed for chlorophyll and nitrate ions are needed for amino acids. Complete set of Chapter 2 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.18 - Understand the process of photosynthesis and its importance to the conversion of light energy into chemical energy. Specification Point 2.19 - Know the word equation and balanced chemical symbol equation for photosynthesis. Specification Point 2.20 - Understand how varying carbon dioxide concentration, light intensity and temperature affect the rate of photosynthesis. Complete set of Chapter 2 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.23 - Practical: Investigate photosynthesis, showing the evolution of oxygen from a water plant, the production of starch and the requirements of light, carbon dioxide and chlorophyll. Complete set of Chapter 2 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.1 - Understand how the similarities in the reactions of the group 1 elements with water provide evidence for their recognition as a family of elements. Specification Point 2.2 - Understand how the differences between the reactions of the alkali metals with air and water provide evidence for the trend in reactivity in group 1. Specification Point 2.3 - Use knowledge of trends in group 1 to predict the properties of other alkali metals. Specification Point 2.4C - Explain the trend in reactivity in group 1 in terms of electronic configurations. Complete set of Chapter 4 Lectures are available.