monoiane fast onavan 10. Since transport of materials in and out of the cell can
ID: 3509263 • Letter: M
Question
monoiane fast onavan 10. Since transport of materials in and out of the cell can only happen at the cell's surface, what problem does this pose for larger cells? Lorger ceiis houe a emler surfaee arees and ma 11. Do larger organisms have larger cells than smaller organisms, or more cells than smaller organisms? Explain. smaler ogansms colis are an -ne same S 12. What is the advantage of having folded membrane surrounding the cell (i.e. plasma membrane), or within the cytoplasm (i.e. endoplasmic reticulum) or within organelles (i.e. chloroplast)? for tnat Cons size and it increases the raste mo Haut, J. (2012). Modified from "Limits to Size-Why are Cells so Smalil?"Explanation / Answer
Answer;(explanation)
10) The problem with larger cells, when compared to smaller cells, is that they have 'a smaller surface area to volume ratio'. It is not just surface area which determines the amount of transport that can happen across the given cell but the volume matters too. Larger the cells larger the volume so less surface area to volume ratio. But, if the cell is small, the volume is going to be small too and hence the ratio of area and volume is going to be higher.
Higher this ratio better the transport. So small cells can transport more materials in and out than larger cells.
11) The characteristic difference between a larger and a small organism,( example a multicellular and a unicellular organism) is in the number and not in the size. In multicellular organisms the energy needed to sustain the organism is high, but since they are made up of numerous cells, they together and produce this kind of energy. But that's not the case for a single-celled organism where the entire functions need to be carried out by the single cell itself and the cell itself is a whole organism. So, they have larger sizes than the cells in a multicellular organism. Amoeba has a size of ranging between 250-750 microns whereas plant and animal cells have sizes only between 10-100 microns.
3) The folded membrane in endoplasmic reticulum provides larger surface area so that more number of ribosomes can attach here and produce more number of proteins. The plasma membrane of intestinal cells are folded to form structures called microvilli; thus increasing the surface area and more absorption of digested products.similarily, chloroplasts have an innermost membrane called the thylakoid membrane which basically consists of highly folded stack-like structures carrying chlorophyll needed for photosynthesis.
So folded membranes offer more surface area to these structures helping them do more transport, and synthesize more material.
Answers 11 and 12 are correct and 10 is partially correct but instead of mentioning the surface area, the surface area to volume ratio should be mentioned.
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