Name the cell-organelles that are double membrance bound. What are the characteristics of two organells ? State their functions.
Answers
Mitochondria and chloroplasts are the two organelles that are double-membrane-bound. Mitochondria are double- membrane-bound structures. The membrane of a mitochondrion is divided into the inner and outer membranes, distinctly divided into two aqueous compartments – outer and inner compartments.
Mitochondria and chloroplasts are the two organelles that are double-membrane-bound.
Characteristics of chloroplasts
Chloroplasts are double-membrane-bound structures.
They are divided into outer and inner membranes, further divided into two distinct regions:
(i) Grana are stacks of flattened discs containing chlorophyll molecules. The flattened membranous sacs are called thylakoids. The thylakoids of adjacent grana are connected by membranous tubules called stroma lamellae.
Characteristics of the mitochondria
Mitochondria are double- membrane-bound structures. The membrane of a mitochondrion is divided into the inner and outer membranes, distinctly divided into two aqueous compartments – outer and inner compartments. The outer membrane is very porous, while the inner membrane is deeply-folded.
These folds are known as cristae. They are the sites for ATP-generating chemical reactions. The membrane and matrix of a mitochondrion contains specific enzymes meant for aerobic respiration. They have their own DNA and ribosomes. Thus, they are able to make their own proteins. This is why they are considered as semi-autonomous organelles
Functions of the mitochondria:
(i) They are the sites for cellular respiration.
(ii) They provide energy in the form of ATP for all vital activities of living cells.
(iii) They have their own DNA and ribosomes. Hence, they are regarded as semi-autonomous organelles.
Functions of chloroplasts:
(i) They trap solar energy and utilise it for manufacturing food for plants. Hence, they are involved in the process of photosynthesis.
(ii) They contain the enzymes required for the synthesis of carbohydrates and proteins.
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