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...
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...
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...
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...
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 ...
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...
Nucleotide Structure Nucleic acids such as DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) are macromolecules (giant molecules) Like proteins (polypeptides) and carbohydrates (polysaccharide...
Mitosis in Root Tips: Observing & Drawing Growth in plants occurs in specific regions called meristems The root tip meristem can be used to study mitosis The root tip meristem can be found just...
Mitosis: The Stages Mitosis is the process of nuclear division by which two genetically identical daughter nuclei are produced that are also genetically identical to the parent cell nucleus (they h...
How a Tumour Forms Cancers demonstrate how important it is that cell division is precisely controlled, as cancers arise due to uncontrolled mitosis Cancerous cells divide repeatedly and uncontrolla...
The Significance of Stem Cells A stem cell is a cell that can divide (by mitosis) an unlimited number of times Each new cell (produced when a stem cell divides) has the potential to remain a stem c...
The Significance of Telomeres The ends of the chromatids in chromosomes are ‘sealed’ with protective structures called telomeres They are made of non-coding DNA (DNA that does not contain genes) th...
