Zusammenfassung der Ressource
Cell Division and DNA
- Cell Structure and Functions
- Unicelllular - One celled
- Multicellular= More than 1 cell
- Nucleus - Control centre. Contains DNA. Reproduces cells
- Cell Membrane - boundary around cell. control exit and entry of substance
- Cytoplams - all contents in cell except nuclueus
- Ribosomes - small organelles, make proteins or structures
- Chloroplasts - contains chlorophyll, pigment to convert sun into food photosythesis
- Vacuole - Sacs to store nutrients, waste products and food
- Cell wall - tough outer to make plant stronger
- Genetic Infomation
- DNA located in nucleus
- Genetic info stored in chemical -DNA
- Deoxyribonucleic Acid
- Shaped in a double helix
- nucleotides -subuntils of DNA
- Adenine
- Guanine
- Cytosine
- Thymine
- Sugar and phosphate backbone
- Nitrogen bond
- Genes Chromosones and DNA
- Gene - Unit of inhertence
- sequence of nucleotides is a chemical code
- DNA molecule = a gene
- Thousands of genes wrapped up to make thread like structure - chromosone
- Come in 23 pairs with 22 the same and 23rd determines boy or girl
- DNA Repilcation
- Mitosis - division of cell into 2 to reproduce cells
- copying of genetic infomation - DNA replication
- Daughter cells may have different genetic code if error happpens
- mutation- accidental changes to DNA or CHROMOSONE
- Mutation in body - cause death of one cell or may become cancerous
- in a gamate may kill egg or sperm or embryo
- Cell theory
- All living things are made out of cells
- Cells are the basic units or building blocks of life
- Are cells that come from other cells
- Functions of life
- To grow
- To reproduce
- Take in substances from their surroundings and assimilate
- respond
- excrete wast
- extract energy form food
- Types of cells
- Cell>Tissue>organ>organ system