EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：1.5.5 Calculate Percentage Yield Calculate Percentage Yield Yield is the term used to describe the amount of product you get from a reaction...
Movement of the Skeleton The effective movement of the human body requires both muscle and an incompressible skeleton This is because muscles will only produce effective movement if they pull on a ...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：1.5.4 Calculate Reacting Masses Calculate Reacting Masses Chemical equations can be used to calculate the moles or masses of reactants and p...
Limiting Antibiotic Resistance Hospital acquired infections Infections that are contracted by a patient while in hospital are known as hospital acquired infections (HAIs) The transmission of HAIs i...
Types of Antibiotics When humans experience a bacterial infection, they are often prescribed antibiotics Antibiotics are chemical substances that damage bacterial cells with little or no harm to hu...
Evolutionary Race Between Pathogens & Host Vertebrates have evolved over millions of years to have immune systems that are capable of dealing with a wide range of different pathogens Pathogens,...
Types of Immunity Developing immunity The immune system is activated when a new antigen is encountered This launches a primary immune response consisting of a non-specific immune response followed ...
Post-transcriptional Modification Antibody molecules consist primarily of protein They contain four separate polypeptide chains, two of which are longer, heavy chains, and two of which are shorter,...
B Cell Response B cells, also known as B lymphocytes, are a second type of white blood cell in the specific immune response B cells remain in the bone marrow as they mature, hence the B in their na...
