Additional Biology

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Ks3 Science Flashcards on Additional Biology, created by zaroon_riaz on 04/05/2013.
zaroon_riaz
Flashcards by zaroon_riaz, updated more than 1 year ago
zaroon_riaz
Created by zaroon_riaz over 11 years ago
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Topic 1 The Components of Life
Components + function of organelles in both animal and plant cell Cell membrane: allows the diffusion of certain molecules (glucose, oxygen) Cytoplasm: contains tiny organelles which carry out life processes Mitochondria: in cytoplasm responsible for respiration Nucleus: contains DNA and controls cell activity
Components + function of organelles in only plant cell Cell wall: made of cellulose, helps keep the plant in shape Large Vacuole: filled with cell sap to help keep cell rigid Chloroplasts: contains chlorophyll, absorbs light for photosynthesis
Light Microscopes x1500 magnification uses visible light
Electron Microscopes x2,000,000 magnification uses electron beams
Bacterium cell Cell wall: not made of cellulose, help keep shape but more flexible Cell membrane: control movement of substances Chromosomal DNA: giant loop of DNA Plasmid DNA: extra loops of genetic information Flagellum: helps swimming
Length of an object Length of magnified object/ magnification
What are DNA, genes and chromosomes? DNA: carries genetic information Genes: section of DNA that codes for a specific protein Chromosomes: made up of a string of genes
Describe the structure of DNA > Double stranded helix structure > Linked at regular intervals with complementary base pairs > Guanine and Cytosine > Adenine and Thymine > Joint together with weak hydrogen bonds
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