Are the different types of plastids interchangable? If yes, give examples where they are getting converted from one type to another.
Yes, different types of plastids are interchangable in form. Plastids are of three main types – leucoplasts, chromoplasts and chloroplasts. Depending upon the condition and maturity stage one type of plastid change into another plastid.
Chromoplasts are formed either from leucoplast or chloroplasts. e.g., Change of colour from green to reddish during the ripening of tomato and chilli is due to transformation of chloroplasts to chromoplasts.
In capsicum, the cells of ovary consist of leucoplasts. When ovary changes into fruit, leucoplasts are transformed into chloroplasts.
When the fruit ripens, chloroplast are converted into chromoplast. The leucoplast in stem tubers of potato, on exposure to sunlight transform to chloroplasts.
Give the biochemical composition of plasma membrane. How are lipid molecules arranged in the membrane?
The genomic content of the nucleus is constant for a given species where as the extra chromosomal DNA is found to be variable among the members of a population. Explain.
Are the different types of plastids interchangable? If yes, give examples where they are getting converted from one type to another.
Structure and function are correctable in living organisms. Can you justify this by taking plasma membrane as an example?
Are the different types of plastids interchangable? If yes, give examples where they are getting converted from one type to another.
Is there a species specific or region specific type of plastids? Flow does one distinguish one from the other?
Discuss briefly the role of nucleolus in the cells actively involved in protein synthesis.
Write the functions of the following
(a) Centromere (b) Cell wall
(c) Smooth ER (d) Golgi apparatus
(e) Centrioles
Is extra genomic DNA present in prokaryotes and eukaryotes? If yes, indicate their location in both the types of organisms.
Eukaryotic cells have organelles which may
(a) not be bound by a membrane
(b) bound by a single membrane
(c) bound by a double membrane
Group the various sub-cellular organelles into these three categories.
Briefly give the contributions of the following scientists in formulating the cell theory.
(a) Rudolf Virchow
(b) Schleiden and Schwann
Differentiate between Rough Endoplasmic Reticulum (RER) and Smooth Endoplasmic Reticulum (SER).