Advertisement
Advertisement
chloroplast
[ klawr-uh-plast, klohr- ]
chloroplast
/ ˈklɔːrəʊˌplæst /
noun
- a plastid containing chlorophyll and other pigments, occurring in plants and algae that carry out photosynthesis
chloroplast
/ klôr′ə-plăst′ /
- A plastid in the cells of green plants and green algae that contains chlorophylls and carotenoid pigments and creates glucose through photosynthesis. In plants, chloroplasts are usually disk-shaped and can reorient themselves in the cell to vary their exposure to sunlight. Chloroplasts contain the saclike membranes known as thylakoids , which contain the chlorophyll and are arranged in stacklike structures known as grana. Besides conducting photosynthesis, plant chloroplasts store starch and are involved in amino acid synthesis. Like mitochondria, chloroplasts have their own DNA that is different from the DNA in the nucleus, and chloroplasts are therefore believed to have evolved from symbiont bacteria, their DNA being a remnant of their past existence as independent organisms.
- See more at cell
Discover More
Derived Forms
- ˌchloroˈplastic, adjective
Discover More
Other Words From
- chloro·plastic adjective
Discover More
Word History and Origins
Origin of chloroplast1
First recorded in 1885–90; chloro(phyll) + -plast
Discover More
Example Sentences
In each assimilating cell there is usually a single large chloroplast.
From Project Gutenberg
The large chloroplast in each half is composed of six longitudinal plates, united at the axis of the cell.
From Project Gutenberg
Advertisement
Advertisement
Advertisement
Advertisement
Browse