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Dictionary » S » Stroma

Stroma

Definition

noun, plural: stromata

(1) (cell biology) The spongy, colorless matrix of a cell that functionally supports the cell.

(2) (anatomy) The supporting framework of an organ, a gland or other structure, usually composed of connective tissue cells, as distinguished from the parenchyma cells or tissues performing the special function of the organ or bodily part.

(3) (botany) The matrix of the chloroplast which is a thick fluid in between grana where various enzymes, molecules and ions are found, and where the dark reaction (or carbohydrate formation reactions) of photosynthesis occurs.

(4) (mycology) A compact, somatic mass of tissue producing fruiting bodies, and made up of asexual hyphae.


Supplement

Word origin: Late Latin strōma, mattress, covering, from Greek, bed.
Related forms: stromal (adjective)

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Re: photosynthesis

i think C is false, because p680 donats electrons to pq,where as this pq after giving electron to cytochrome(b6f),it accepts proton from the stroma because it dosent have any metal ion just to neutralise/balance it accept protoh from stroma then through vectorial translocation it gives proton(taken ...

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by pushy
Wed Dec 03, 2008 9:25 am
 
Forum: Molecular Biology
Topic: photosynthesis
Replies: 2
Views: 841

Light-dependent Reaction Questions

... + (2H+) --> NADPH + (H+), would the decrease in mols of (H+) after this redox reaction contribute to the lower concentration of H+ in the stroma? 2. Is the electron from the P700 chlorophyll a molecule furthered into the electron transport chain (passing through Fd and NADP+ reductase) ...

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by vertciel
Sat Oct 25, 2008 3:17 pm
 
Forum: Botany Discussion
Topic: Light-dependent Reaction Questions
Replies: 3
Views: 1833

I need answers to the following questions...

1. Where is most of the water in the following reaction produced? C6H12O6 (glucose) + O2 -----> CO2 + H2O a. chloroplast stroma b. thylakoid lumen c. glycolysis and Krebs cycle d. fermentation e. mitochondrial matrix 2. At the end of mitosis, each G1 daughter cell has _________. a. ...

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by WiseIdiot
Sat Oct 18, 2008 5:55 pm
 
Forum: Cell Biology
Topic: I need answers to the following questions...
Replies: 3
Views: 1030

Photosynthesis Trivia

... into energy rich glucose are located in the (A.) lysosomes (B.) ribosomes (C.) mitochondrial cristae (D.) chloroplast grana (E.) chloroplast stroma 15. The anabolic process in which sunlight energy and water are utilized and molecular oxygen is produced is (A.) photosystem I. (B.) photosystem ...

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by vstexas09
Mon Oct 13, 2008 12:46 am
 
Forum: Cell Biology
Topic: Photosynthesis Trivia
Replies: 5
Views: 5333

photosynthesis

... ATP are used in the light independent reactions in a set of reactions known as the Calvin cycle. These light independent reactions occur in the stroma of the chloroplast. 6 CO2 combine with 6 ribulosebisphosphates to create 6 very unstable and thus reactive 6-carbon molecules. Shortly after ...

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by dranseth
Mon Mar 31, 2008 2:27 am
 
Forum: Botany Discussion
Topic: photosynthesis
Replies: 2
Views: 1863
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