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A chloroplast (/ ˈ k l ɔːr ə ˌ p l æ s t,-p l ɑː s t /) [1] [2] is a type of organelle known as a plastid that conducts photosynthesis mostly in plant and algal cells. Chloroplasts have a high concentration of chlorophyll pigments which capture the energy from sunlight and convert it to chemical energy and release oxygen.
The chloroplast may be discoid, cup-shaped (e.g. Chlamydomonas), spiral or ribbon shaped. [example needed] Most chlorophytes have one or more storage bodies called pyrenoids (central proteinaceous body covered with a starch sheath) that are localised around the chloroplast. Some algae may also store food in the form of oil droplets.
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Each plastid creates multiple copies of its own unique genome, or plastome, (from 'plastid genome')—which for a chlorophyll plastid (or chloroplast) is equivalent to a 'chloroplast genome', or a 'chloroplast DNA'. [11] [12] The number of genome copies produced per plastid is variable, ranging from 1000 or more in rapidly dividing new cells ...
A diagram showing the simple structure of a chloroplast}} {{bs|1=Vektorska verzija datoteke File:Chloroplast-new.jpg. Dijagram prikazuje jednostavnu strukturu hloroplasta} File usage No pages on the English Wikipedia use this file (pages on other projects are not listed).
English: Diagram of chloroplast replication. Sources: 1—The Plant Cell—A Plant-Specific Dynamin-Related Protein Forms a Ring at the Chloroplast Division Site. 2—Traffic—Chloroplast Division. 3—Journal of Cell Science—DNA replication in chloroplasts
Each of the envelope membranes is a lipid bilayer that is between 6 and 8 nm thick. The lipid composition of the outer membrane has been found to be 48% phospholipids, 46% galactolipids and 7% sulfolipids, while the inner membrane has been found to contain 16% phospholipids, 79% galactolipids and 5% sulfolipids in spinach chloroplasts.
Chloroplasts are green and usually cup-shaped. [10] A key feature of the genus is its two anterior flagella, each as long as the other. [8] The flagellar microtubules may each be disassembled by the cell to provide spare material to rebuild the other's microtubules if they are damaged. [11]