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Identifying Organelles Name:___________________________ A micrograph is a photograph or digital image taken through a microscope or similar device to show a magnified image of an item. An Electron Micrograph is one such image; it is produced using an Electron microscope. Examples of electron micrographs of parts of cells viewed using the TEM (Transmission Electron Microscope) are shown below. Examine the images and complete the questions asked 1. 2 A Identify the organelles labelled A: Golgi bodies Support your choice: Appearance is stack of membranes(golgi body) with small circles(vesicles) surrounding which is what golgi bodies look like. The TEM above shows two of the same type of organelle. Identify this organelle: mitochondrion (NOTE: organelle is singular to should use singular form of the organelle) Support your choice: TS of mitochondrion is circular like this and you can see folded internal membranes which are typical of a mitochondrion. 3. Identify the organelles labelled B ribosomes Support your choice: B appear to be very tiny and circular which is how ribosomes appear when view with TEM(like spots) B State two locations within a cell where this organelle could be found Suspended in cytosol Bound to the rough ER If you said inside mitochondria and chloroplast you are also correct. But the ribosomes for general cell use are in the first two locations. What types of cells is this organelle found in? All living cells have ribosomes(Cells from kingdoms monera, animalia, plantae, fungi and Protista) 4. Identify this organelle: Chloroplast Support your choice: This organelle has the flattened shape of a chloroplast and the clear stacks of flattened disks within(grana) which are a key feature of chloroplasts What types of cells would this organelle be found in? Some types of plant cells(photosynthetic plant cells) and some protist cells.( to say eukaryotic cells is too broad, even though it is correct since they are not found in prokaryotic cells, although they are not found in the majority of eukaryotic cells either) 4 Identify and label the indicated organelles from the section through a rat liver cell: Based on this image state two inferences that can be made about this cell and justify each one. (i) That the cell is eukaryotic, since membrane bound organelles are evident eg. Nucleus and ONLY eukaryotic cells have m.b.o OR which are lacking in prokaryotic cells. (ii) That the cell requires quite a lot of energy, since there seems to be an abundance of mitochondria which are the organelle that produce ATP via respiration + Other sensible inferences Nuclear membrane Nucleus mitochondria ER (hard to tell which type) 5. The organelles labelled C contain strong hydrolytic(digestive) enzymes. Name Organelle C: lysosome C Explain whether or not you would expect to find this type of organelle in a prokaryotic cell. No since prokaryotic cells lack all membrane bound organelles AND lysosomes are membrane bound organelles.