What is plastids, Biology

Assignment Help:

What is Plastids?

The most obvious difference between plant cells and other eukaryotic cells is that cells of most plants contain unique organelles called plastids, which include chloroplasts, chromoplasts, and leukoplasts.

Chloroplasts contain a special pigment known as chlorophyll, which absorbs sunlight energy. This sunlight energy is then converted to another form of energy utilizable by other living organisms. This energy conversion process is referred to as photosynthesis, which combines carbon dioxide from the air and hydrogen from water to form sugars and other organic compounds. Oxygen is returned to the atmosphere as a byproduct.

Chloroplasts, like mitochondria, also contain DNA and are postulated to have arisen as prokaryotes that entered the eukaryotic cells and evolved to become part of the cell's structure. Chloroplasts are bounded by a double membrane. The interior membrane is explanded into pancake-shaped membranes, or thylakoids, which are assembled in stacks called grana. A dense solution called the stroma surrounds the grana.

Chromoplasts synthesize and store pigments such as yellow xanthophylls, orange carotenes, and various red pigments.

Leukoplasts are an important component of food plants, and these colorless or white organelles are where plant cells store starches, proteins, and lipids.

 


Related Discussions:- What is plastids

General zoology, please help me with the general characteristics of the fol...

please help me with the general characteristics of the following classes:1.mammalia,2.ostichthyes,3.cyclostomata,4chondrichthyes,5.amphibia,6.reptilia

Determine the principles of suturing, Determine the Principles of suturing ...

Determine the Principles of suturing These are universal principles which are applicable in all aspects not just implant surgery: 1. Sutures should always be inserted throug

Explain mechanism for reduce the absorption of nutrients, Explain Mechanism...

Explain Mechanism for reduce the absorption of nutrients? The absorption of nutrients is also reduced by mechanisms other than increasing the viscosity of gastrointestinal cont

Synovial fluid and amniotic fluid collection, Synovial fluid Collection: ...

Synovial fluid Collection: The technique of obtaining synovial fluid is called arthrocentesis. It is used to characterize type of arthritis and to differentiate inflammatory

Explain contractile proteins, Explain Contractile Proteins These protei...

Explain Contractile Proteins These proteins participate in contractile processes such as muscle proteins as well as those found in other  cells and tissues. In the latter, thes

Cyanotic congenital heart disease, Cyanotic Congenital Heart Disease   ...

Cyanotic Congenital Heart Disease   So far we have discussed the acyanotic congenital heart disease. Now we shall discuss some of  the main cyanotic congenital heart diseases.

Role of carbohydrates in dyslipidemia, Q. Role of Carbohydrates in dyslipid...

Q. Role of Carbohydrates in dyslipidemia? It is important to know about these carbohydrates, as they all differ in their digestive properties. The rate of absorption is variabl

Apsirin determination, Indirect determination: By determining the weight...

Indirect determination: By determining the weight of the filler on the dried filter paper you can calculate the weight of aspirin in each tablet: weight of acetylsalicylic ac

Summary of determinants of health status, Normal 0 false fals...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

The hybridization reaction, As double-stranded DNA is heated a temperature ...

As double-stranded DNA is heated a temperature is reached at that the two reaction strands divided.  This procedure is called as denaturation.  The temperature at that half of the

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd