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Question

In eukaryotic cell, the type of ribosome is
70S and 80S both
Only 70S
Only 80S
Only 50S

A

Only 70S

B

Only 80S

C

70S and 80S both

D

Only 50S

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Solution

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Eukaryotic ribosomes are also known as 80S ribosomes, referring to their sedimentation coefficients in Svedberg units, because they sediment faster than the prokaryotic (70S) ribosomes. Eukaryotic ribosomes have two unequal subunits, designated small subunit (40S) and large subunit (60S) according to their sedimentation coefficients. Both subunits contain dozens of ribosomal proteins arranged on a scaffold composed of ribosomal RNA (rRNA). Prokaryotic ribosomes are known as 70S.
Therefore, the correct answer is option C.

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Q1

Read the following statements and identify the correct option given.

I. In prokaryotic cell, the nuclear membrane, chloroplast, mitochondria, microtubules, and different kinds of pili are absent.
II. In eukaryotic cell, the nuclear membrane, chloroplast, mitochondria, and pili are present.
III. In a prokaryotic cell, the ribosome is of 70S type and in mitochondria of eukaryotic animal cell, the ribosome is 80S type.

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In eukaryotic cell, the type of ribosome is

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Eukaryotic 80S ribosome breaks into

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Q4

Difference between 70S and 80S type ribosome?

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Q5

Match the organelle/organism and type of ribosomes.

Organelle / organism	Ribosome
(A) Chloroplast	(p) 70S
(B) Fungal mitochondria	(q) 80S
(C) Eukaryotic cell	(r) 55S
(D) Mammalian mitochondria	(s) 77S

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