The Purpose of Semi-Conservative Replication Before a (parent) cell divides, it needs to copy the DNA contained within it This is so that the two new (daughter) cells produced will both rece...
Edexcel IGCSE Maths 复习笔记 2.4.1 Factorising Quadratics - Basics What is a quadratic expression? A quadratic expression looks like this:ax2 + bx + c (as long as a ≠ 0) Note: If there are any high...
Appreciating How the Function of DNA Was Determined DNA was actually first observed in the 1800s by a Swiss scientist called Friedrich Miescher Miescher is credited with being the first pers...
Ribosomes Ribosomes are small organelles that are either free in the cytoplasm (of all cells) or are attached to the rough endoplasmic reticulum (only in eukaryotic cells) Ribosomes are the ...
The Structure of RNA Like DNA, the nucleic acid RNA (ribonucleic acid) is a polynucleotide – it is made up of many nucleotides linked together in a chain Like DNA, RNA nucleotides contain th...
Edexcel IGCSE Maths 复习笔记 2.3.3 Expanding Three Brackets Expanding three brackets We’re still following the basic principle of expanding here – get rid of the brackets by multiplying out We just...
The Structure of DNA The nucleic acid DNA is a polynucleotide – it is made up of many nucleotides bonded together in a long chain A DNA nucleotide DNA molecules are made up of two pol...
Nucleotide Structure & the Phosphodiester Bond Both DNA and RNA are polymers that are made up of many repeating units called nucleotides Each nucleotide is formed from: A pentose sugar (...
Practical Skill: Control of Variables & Uncertainty Enzyme rate experiments are experiments that are carried out to determine the effect of changing a particular factor on the rate of a ...
