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Three of the following statements regarding cell organelles are correct, while one is wrong. Which one is wrong?
- Lysosomes are double-membraned vesicles budded off from Golgi apparatus and contain digestive enzymes.
- Endoplasmic reticulum consists of a network of membranous tubules and helps in transport, synthesis and secretion.
- Leucoplasts are bound by two membranes, lack pigment but contain their own DNA and protein synthesizing machinery.
- Spherosomes are single membrane bound and are associated with synthesis and storage of lipids.
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Lysosomes are bound by the single layer of typical phospholipids.
The endoplasmic reticulum is eukaryotic organelle with a network of tubules, vesicles and cisternae within the cells. It serves in synthesis and transport of proteins and lipids.
Leucoplasts are the type of plastids that lack any pigments and hence are colorless. Ike other plastids, they are semi-autonomous and have their own DNA and protein synthesizing machinery.
Spherosomes are small, single membrane bound organelles that serve to store triacylglycerols in form of oils and in the synthesis of cutin and wax.
So, the correct answer is option A.
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Q4
Categorise the following functions respectively associated with the given cell organelles P and Q.
(i) Works as a seat of protein synthesis.
(ii) Helps in secretion of mucus, enzymes and hormones.
(iii) Helps in storage of secretory products.
(iv) Helps in development of acrosome of sperm.
(v) Helps in membrane biogenesis.
(vi) Forms a continuous transport channel with nuclear membrane.
(i) Works as a seat of protein synthesis.
(ii) Helps in secretion of mucus, enzymes and hormones.
(iii) Helps in storage of secretory products.
(iv) Helps in development of acrosome of sperm.
(v) Helps in membrane biogenesis.
(vi) Forms a continuous transport channel with nuclear membrane.
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