70719
Description
Flashcards by zaroon_riaz, updated more than 1 year ago
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Created by zaroon_riaz
over 11 years ago
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| Question | Answer |
| 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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