Unicellular and Multicellular organisms 0.0 / 5 ? BiologyCellular processes and structureInternational BaccalaureateOther Created by: Lotto65Created on: 09-10-16 15:25 How does the paramecium take part in metabolism? Produces enzymes which catalyse reactions in the cytoplasm 1 of 21 How does a paramecium respond to its external environment? Uses cilia to move/ stick to surfaces and reverse its direction when it comes into contact with a solid object 2 of 21 How does the paramecium take part in homeostasis? Contractive vacuole expels excess water and plasma membrane controls passage of substances 3 of 21 How does the paramecium grow? Mitosis and by accumulating organic matter and minerals from food to increase its dry mass and size 4 of 21 How does the paramecium reproduce? Meiosis and gametes 5 of 21 How does the paramecium excrete? Diffusion/ active transport through the surface 6 of 21 How does the paramecium get nutrition? Ingests and digests smaller organisms in vesicles and stores it in the food vacuole 7 of 21 How does an algae chlorella excrete? Diffusion using the plasma membrane to control the passage of substances in and out of the cell 8 of 21 How does the algae chlorella gain nutrients? Photosynthesis in the chloroplasts produces glucose and oxygen 9 of 21 How does the algae chlorella reproduce? Mitosis 10 of 21 What happens to the surface area: volume ratio as a cell gets bigger? Decreases 11 of 21 Why do cells need to be small? If a cell is too large, it cannot take in or excrete substances quickly because the substances have further to travel which could poison the cell 12 of 21 The rate at which materials enter or leave cells relies on... SA 13 of 21 The rate at which substances are used and produced relies on... Volume 14 of 21 Give an advantage of multicellular organisms? Groups of cells can have different functions so more efficient due to division of labour (differentiation) 15 of 21 Describe emergent properties The whole is greater than the sum of its parts 16 of 21 Give an example of emergent properties The combination of a tiger's differentiated cells for different functions causes extra properties like the ability to hunt and kill 17 of 21 What is a genome? An organism's entire set of genes 18 of 21 What happens to the genome of differentiating cells? Only certain genes are used so the cell can follow its development pathway 19 of 21 What does it mean when a cell is committed? It cannot change its development pathway to a different one once it has started differentiating 20 of 21 Why do big cells struggle to cool down? More chemical reactions take place so it takes longer to lose heat- longer to cool down 21 of 21
(2) Cells in multicellular organisms differentiate to carry out specialized functions by expressing some of their genes but not others 2.0 / 5 based on 1 rating
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