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Criado por Liberty Sims
mais de 9 anos atrás
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Questão | Responda |
Nucleus | contain genetic material that controls the activities of the cell |
cytoplasm | a gel-like substance where most of the chemical reactions happen. it contains enzymes that control these chemical reactions. |
cell membrane | holds the cell together and controls what goes in and out |
mitochondria | where actions for respiration take place |
ribosomes | where proteins are made in the cell |
cell wall | supports and strengthens the cell |
permanent vacoule | contains cell sap; sugars and salts |
choloroplasts | where photosynthesis occurs. (contaisn cholophyll, which absorbs light energy needed for photosynthesis |
yeast cells | - single celled microorganisms - has a nucleus, cytoplasm & cell membrane surrounded by a cell wall |
bacterial cells | - single celled micro organisms - has cytoplasm and a cell membrane surrounded by a cell wall - don't have a nucleus |
what is a specialised cell? | a specialised cell is a cell that performs a specific function. |
(examples of specialised cells) sperm and egg cells | -both specialised for reproduction - both carry DNA - egg cell has huge food reserves to feed embryo - sperm cell has streamlined head & tail to help it swim |
(examples of specialised cells) red blood cells | - adapted to carry oxygen to every cell in the body - biconcave shape which gives them a big surface area for absorbing oxygen - shape also helps them to squeeze through capillaries |
(examples of specialised cells) palisade leaf cells | - adapted for photosynthesis - grouped together at the top of a leaf where most photosynthesis happens - packed with chloroplasts which absorb the light energy |
(examples of specialised cells) palisade leaf cells | - tall, w/long sides, which means there's more surface area exposed for absorbing CO2. |
What is diffusion? | the gradual spreading out of particles from an area of high concentration to an area of low concentration. |
diffusion cont | - happens in liquids and gases due to particles being able to move around |
diffusion across cell membranes | only very small molecules can diffuse through cell membranes (e.g oxygen needed for respiration, glucose, amino acids, and water) |
diffusion across cell membranes | larger molecules such as starch and proteins can't fit through the membranes as they're too big. |
diffusion cont | diffusion in cell membranes is the same as diffusion with air |
rate of diffusion | rate of diffusion is affected by difference in concentration of the particles - the bigger the difference in concentration, the faster the diffusion rate |
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