B2.7 Cell Division and inheritance Summary Characteristics are passed on from one generation to the next in both plants and animals. Simple genetic diagrams can be used to show this. There are ethical considerations in treating genetic disorders. Genetic material In...
B2.8 Speciation Summary Changes in the environment of plants and animals may cause them to die out. The fossil record shows that new organisms arise, flourish, and after a time become extinct. The record also shows changes that lead to the formation of new species....
B2.6 Respiration Summary Respiration in cells can take place aerobically or anaerobically. The energy released is used in a variety of ways. The human body needs to react to the increased demand for energy during exercise. Respiration Definition: The process of...
B2.5 Proteins Summary Proteins have many functions, both inside and outside the cells of living organisms. Proteins, as enzymes, are now used widely in the home and in industry. Protein structure Protein molecules are made up of long chains of amino acids. ...
B2.4 Organisms and their environment Summary Living organisms form communities, and we need to understand the relationships within and between these communities. These relationships are affected by external influences. Physical factors Physical factors that may affect...
B2.3 Photosynthesis Summary Green plants and algae use light energy to make their own food. They obtain the raw materials they need to make this food from the air and the soil. The conditions in which plants are grown can be changed to promote growth....
B2.1 Cells and Cell Structures Summary All living things are made up of cells. The structures of different types of cells are related to their functions. To get into or out of cells, dissolved substances have to cross the cell membranes. Cells...
B2.1 Tissues, Organs and Organ Systems Summary The cells of multicellular organisms may differentiate and become adapted for specific functions. Tissues are aggregations of similar cells; organs are aggregations of tissues performing specific...