CIE A Level Biology复习笔记7.1.3 Xylem Vessels Elements
Xylem Vessel Elements: Structure & Function The functions of xylem tissue in a plant are: Vascular tissue that transports dissolved minerals and water around the plant Structural support Food s...
CIE A Level Biology复习笔记7.1.2 Xylem & Phloem Distribution
Xylem & Phloem Distribution Xylem The functions of xylem tissue in a plant are: Vascular tissue that carries dissolved minerals and water up the plant Structural support Food storage Xylem tiss...
CIE A Level Biology复习笔记7.1.1 Plant Transverse Sections
Transverse Sections: Stems, Roots & Leaves Dicotyledonous (dicots) plants Dicotyledonous (dicots) plants have: Seeds that contain two cotyledons (seed leaves) Network of veins Leaves that typic...
CIE A Level Biology复习笔记6.2.5 Gene Mutations
Gene Mutations & Their Effect on Polypeptides A gene mutation is a change in the sequence of base pairs in a DNA molecule that may result in an altered polypeptide Mutations occur continuously ...
CIE A Level Biology复习笔记6.2.4 Transcription
Template & Non-Template Strands In the transcription stage of protein synthesis, the section of the DNA molecule where the gene is located (the gene coding for a particular polypeptide) unwinds...
CIE A Level Biology复习笔记6.2.3 Constructing Polypeptides
Constructing Polypeptides: Transcription & Translation A gene is a sequence of nucleotide bases in a DNA molecule that codes for the production of a specific sequence of amino acids, that in tu...
CIE A Level Biology复习笔记6.2.2 The Universal Genetic Code
The Universal Genetic Code A gene is a sequence of nucleotide bases in a DNA molecule that codes for the production of a specific sequence of amino acids, that in turn make up a specific polypeptid...
CIE A Level Biology复习笔记6.2.1 From Gene to Polypeptide
From Gene to Polypeptide A gene is a sequence of nucleotides that forms part of a DNA molecule (one DNA molecule contains many genes) This sequence of nucleotide bases (the gene) codes for the prod...
CIE A Level Biology复习笔记6.1.4 The Structure of RNA
RNA Structure Like DNA, the nucleic acid RNA (ribonucleic acid) is a polynucleotide – it is made up of many nucleotides linked together in a long chain Like DNA, RNA nucleotides contain the nitroge...
CIE A Level Biology复习笔记6.1.3 Semi-Conservative DNA Replication
Semi-Conservative DNA Replication DNA replication occurs in preparation for mitosis, when a parent cell divides to produce two genetically identical daughter cells – as each daughter cell contains ...
CIE A Level Biology复习笔记6.1.2 The Structure of DNA
DNA Structure 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 polynucleotide strands l...
CIE A Level Biology复习笔记6.1.1 Nucleotides
Nucleotide Structure Nucleic acids such as DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) are macromolecules (giant molecules) Like proteins (polypeptides) and carbohydrates (polysaccharide...
