Edexcel IGCSE Maths復(fù)習(xí)筆記 1.5.1 Surds - Basics What is a surd? A surd is the square root of a non-square integer What can we do with surds? 1. Multiplying surds?– you can multiply numbers under s...
Vaccines A?vaccine?is a suspension of?antigens?that are intentionally put into the body to induce?artificial active immunity. A specific immune response where?antibodies?are released by?plasma cell...
Cell Recognition Our bodies have?several defence mechanisms?against?pathogens. These include: Preventing?the?entry?of pathogens by a variety of?physical?and?chemical?defences, such as the skin, muc...
The Fluid Mosaic Model of Membranes Membranes are vital structures found in all cells The cell surface membrane creates an enclosed space separating the internal cell environment from the external ...
Edexcel IGCSE Maths復(fù)習(xí)筆記 1.4.2 Roots & Indices - Harder What are indices? An Index (plural = indices) is just a power that a number (called the base) is raised to: Laws of indices – what you...
Interphase Within multicellular organisms,?not all cells retain the ability to divide Eukaryotic cells that do retain the ability to divide show a cell cycle Mitosis?is part of a?precisely controll...
What are indices? An Index (plural = indices) is just a power that a number (called the base) is raised to: Laws of indices – what you need to know There are lots of very important laws (or ...
The Principles & Limitations of Microscopy Microscopes?can be used to analyse?cell components?and observe?organelles Magnification?and?resolution?are two scientific terms that are very importan...
The Cell Theory Until microscopes became powerful enough to view individual cells, no-one knew for certain what living organisms were made from A scientist called?Robert Hooke?is thought to be the?...
