A-Level Biology - Eukaryotic Cell Components

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Flashcards briefly describing the function of the components of eukaryotes.
Natalie_B
Flashcards by Natalie_B, updated more than 1 year ago
Natalie_B
Created by Natalie_B almost 9 years ago
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Question Answer
Cytoplasm Cytoplasm is a clear, gel-like substance found in all cells. Everything contained within a cell is found suspended in cytoplasm, except the nucleus, which is separated from the cytoplasm by a membrane. Cytoplasm helps rid cells of waste material, aids in cell respiration and helps convert glucose into energy.
Plasma Membrane Controls the types and amounts of substances moving in/out of the cell.
Golgi Apparatus Modifies, sorts & ships proteins and lipids for export or insertion into the plasma membrane.
Secretory Vesicle Contains materials that are to be excreted from the cell. Can also store chemicals to be released when needed.
Mitochondrion (singular) Mitochondria (plural) Produces Adenosine Triphosphate (ATP) via cellular respiration.
Smooth Endoplasmic Reticulum (SER) Makes lipids, degrades fats, inactivates toxins.
Rough Endoplasmic Reticulum (RER) Modifies new polypeptide chains. Synthesises lipids.
Ribosomes Found free in the cell and attached to the RER. Sites of protein synthesis. One ribosome is composed of a large and small subunit. (BBQ Ribs = source of protein)
Lysosomes Digest and recycle materials within the cell. (Lyso - Lipo - stomach - digestion)
Peroxisomes Lipid metabolism, chemical detoxification and oxidation reactions which break down fatty acids and amino acids.
Centrioles Centres that produce and organise microtubules. Made of 9 sets of microtubule triplets.
Microtubules Largest element of the cytoskeleton. Helps the cell resist compression. Provides a track along which lysosomes move through the cell. Pulls replicated chromosomes to opposite ends of a dividing cell.
Microfilament Keeps organelles in place within the cell. Also assists with cell movement. Made of a protein called actin which works with myosin to produce muscle movements, cell division, and cytoplasmic streaming.
Intermediate Microfilament A component of the cytoskeleton. Contributes to cellular structural elements and are often crucial in holding together tissues like skin.
Nucleus Stores the cell's hereditary material (DNA), and coordinates the cell's activities, including growth, metabolism, protein synthesis, and cell division.
Part of the Nucleus: Nuclear Envelope The double lipid bilayer membrane which surrounds the genetic material and nucleolus. The nuclear membrane consists of two lipid bilayers - the inner nuclear membrane, and the outer nuclear membrane.
Part of the Nucleus: Nuclear Pores Protein-lined channels (shown in yellow) in the nuclear envelope that regulate the transportation of molecules between the nucleus and the cytoplasm.
Part of the Nucleus: Nucleolus The nucleolus makes ribosomal subunits from proteins and ribosomal RNA (rRNA). It then sends the subunits out to the rest of the cell where they combine into complete ribosomes.
Part of the Nucleus: Chromatin Chromatin is a complex of DNA and proteins that forms chromosomes within the nucleus of eukaryotic cells. Nuclear DNA does not appear in free linear strands; it is highly condensed and wrapped around nuclear proteins in order to fit inside the nucleus.
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