AQA A Level Biology復(fù)習(xí)筆記2.6.1 Vaccines
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...
AQA A Level Biology復(fù)習(xí)筆記2.5.1 Cell Recognition
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...
AQA A Level Biology復(fù)習(xí)筆記2.4.1 The Structure of Cell Membranes
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
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...
AQA A Level Biology復(fù)習(xí)筆記2.3.1 Interphase
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...
2022北美丘獎即將截止報名！附北美賽區(qū)日程安排
今年的北美丘獎“姍姍來遲”，比去年晚了1個月才開始報名，但截止時間還是6月30日，論文的提交時間甚至還提前了10天！ 現(xiàn)在距丘獎北美賽區(qū)截止報名只剩最后一周了！打算今年參賽、但還沒有報名的同學(xué)抓緊時間了！ ...
Edexcel IGCSE Maths復(fù)習(xí)筆記 1.4.1 Roots & Indices - Basics
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 ...
AQA A Level Biology復(fù)習(xí)筆記2.2.1 Methods of studying cells
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...
AQA A Level Biology復(fù)習(xí)筆記2.1.1 The Cell Theory
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?...
Edexcel IGCSE Maths復(fù)習(xí)筆記 1.3.2 HCFs & LCMs
Edexcel IGCSE Maths復(fù)習(xí)筆記 1.3.2 HCFs & LCMs What are Factors & Multiples? Factors are numbers (or expressions) which divide into another number exactly e.g. 3 is a factor of 18 as?
AQA A Level Biology復(fù)習(xí)筆記1.6.1 The Structure of ATP
The Structure of ATP All organisms require a constant supply of energy to maintain their cells and stay alive This energy is required: In anabolic reactions – building larger molecules from ...
AQA A Level Biology復(fù)習(xí)筆記1.5.1 The Function of DNA & RNA
The Function of DNA & RNA Deoxyribonucleic acid?(DNA) and?ribonucleic acid?(RNA) are both types of?nucleic acid DNA and RNA are both?found in all living cells DNA and RNA are both needed to?bui...
