Which one is the correct option for the labelled diagrams A,B, C and D ?

A – Telocentric chromosome, B – Acrocentric chromo-some, C – Submetacentric chromosome, D – Metacen-tric chromosome
A– Acrocentric chromosome, B – Telocentric chromo-some, C – Metacentric chromosome, D – Submetacen-tric chromosome
A – Submetacentric chromosome, B – Metacentric chro-mosome, C – Telocentric chromosome, D – Acrocentricchromosome
A– Metacentric chromosome, B – Submetacentric chro-mosome, C– Acrocentric chromosome, D – Telocentricchromosome.

Which one of the following cellular parts is correctly described?

Centrioles - Sites for active RNA synthesis.
Lysosomes - Optimally active at a pH of about 8.5
Thylakoids - Flattened membranous sacs forming thegrana of chloroplasts.
Ribosomes - Those on chloroplasts are larger (80S) while those in the cytoplasm are smaller (70S).

Which one of the following structures is an organelle within an organelle?

Solution

Ribosome are small naked (non membrane bound)particles made of r-RNA and proteins. Ribosomes are also seen in the organelles like mitochondria and chloroplasts.

Plant cell may be without

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