Cell structure/cells questions 0.0 / 5 ? BiologyCell structureASOCR Created by: Emily.TCreated on: 25-04-17 17:05 What is the name given to the process by which cells become specialised? Differentiation - happens after an egg is fertilised by a sperm cell and results in all the different cell types you have at birth 1 of 13 From what type of cells have all our tissues originated from? Stem cells 2 of 13 What function do lamellae in chloroplasts perform? Links the grana together - each stack of thylakoid membranes called a granum is linked together by lamellae 3 of 13 White blood cells initially start as stem cells. Where are these found? Bone marrow - has stem cells that are able to differentiate into red blood cells and white blood cells 4 of 13 What is the green substance called that chloroplasts contain? Chlorophyll - is the green pigment which absorbs light energy in photosynthesis 5 of 13 Thylakoid membranes are stacked up inside a chloroplast to form what? Grana - there are many grana inside the chloroplast made of thylakoid membranes linked together by lamellae 6 of 13 Only humans have stem cells, true or false False - All mulitcellular organisms have stem cells (so plants do too) 7 of 13 What do plants use palisade cells for? Maximise photosynthesis - they contain many chloroplasts which are the organelle where photosynthesis takes place 8 of 13 What is the process by which stem cells divide to become specialised? Mitosis - all body cells divide by mitosis except for those which become gametes (sperm and egg cells) 9 of 13 Adult humans have some stem cells in them, true or false? True - in adults they are found in bone marrow, but they are only able to differentiate into red and white blood cells 10 of 13 Stem cells are unspecialised, true or false? True - they are able to become specialised cells (by differentiation) but start off as unspecialised 11 of 13 Where would you find these: lamellae, stroma, grana and thylakoid membranes? In the cholorplasts - they are the principle structures inside a chloroplast 12 of 13 A chloroplast is surrounded by how many membranes? 2 - it has a double membrane - similar to the mitochondria which also have a double membrane 13 of 13
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