Which one of the following cellular parts is correctly described?

Centrioles - sites for active RNA synthesis.

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Ribosomes - those on chloroplasts are larger (80S) while those in the cytoplasm are smaller (70S).

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Lysosomes- optically active at a pH of about 8.5

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Thylakoids - flattened membranous sacs forming the grana of chloroplasts.

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Solution

The correct option is D Thylakoids - flattened membranous sacs forming the grana of chloroplasts.
A thylakoid is a membrane-bound, flattened compartment inside chloroplasts and cyanobacteria. They are the site of the light-dependent reactions of photosynthesis. Thylakoids consist of a thylakoid membrane surrounding a thylakoid lumen.

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Similar questions

Q. The structures that are formed by stacking of organized flattened membranous sacs in the chloroplasts are

Q. Read the given statements A & B and choose the correct option.
A. The ribosomes of the chloroplasts are smaller than the cytoplasmic ribosomes.
B. Chloroplasts can synthesise some of their proteins but they receive other proteins from cytoplasm.

Q. Which of the following is the site for active ribosomal RNA synthesis?

Which of the following is true about Chloroplasts?

(i) Chloroplasts are minute oval bodies bounded by a double membrane.

(ii) Their interior contains closely packed flattened sacs called thylakoids.

(iii) There are over 60 chloroplasts in a cell.

(iv) The pigment chlorophyll is contained in the empty spaces of thylakoids.

Choose the correct option regarding the structure of chloroplast based on the statments given.

Statement 1: The fluid part of the chloroplast is the stroma lamellae.

Statement 2: The membranous sacs arranged one above the other form the grana.

Statement 3: The membrane bound structures joining the grana are the stroma.

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