Question 2

Select one which is not true for ribosome

(a) Made up of two sub-units (b) Form polysome

(c) May attach to mRNA (d) Have no role in protein synthesis

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Solution

(d) Ribosomes are truly called as protein factory and they play a vital role in protein synthesis. Thus, the statement that ribosomes have no role in protein synthesis is not true.

Other statements are true for ribosome

Ribosomes are made up of two subunits, i.e., large and small.

In Prokaryotes it is 70s (50S and 30S).

In eukaryotes it is 80s (60S and 40S).

Polyribosomes

Several ribosomes attach to a single mRNA and form a chain like structure.

Polysomes

They are formed by the attachment of ribosomes with mRNA.

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Similar questions

Q. Given below are the steps of protein synthesis. Arrange them in. correct sequence and select the correct option.
(j) Codon-anticodon reaction between mRNA and aminoacyl tRNA complex.
(ii) Attachment of mRNA and smaller sub-unit of ribosome.
(iii) Charging or aminoacylation of tRNA.
(iv) Attachment of larger sub unit of ribosome to the mRNA-tRNAMet complex.
(v) Linking of adjacent amino acids.
(vi) Formation of polypeptide chain.

Q. Fill in the following blanks with appropriate options.

(A) Information present in the DNA is transcribed in the form of codons in ____(i)______ for protein synthesis.

(B) __(ii)_______is a constituent of ribosomes.

(C) Around 80% of the total cellular RNA is ___(iii)____.

(D) ____(iv)______ carries amino acids to the ribosomes and mRNA to carry out protein synthesis.

Q. Many bacteria have small circular DNA outside the genomic DNA. This extranuclear DNA

(a) Confers certain unique phenotypic characters to bacteria.
(b) Are used to monitor bacterial transformation with foreign DNA.
(c) May attach to a single mRNA and form polysome.
(d) Are also found in all eukaryotic cells.

Q. The ribosomes of polysome translate the mRNA into proteins. This process occurs in

(a) Mitochondria

(b) Cytosol

(c) Nucleoplasm

(d) Chloroplast

The correct one(s) is/are

पॉलिसोम का राइबोसोम, दूत आरएनए (mRNA) को प्रोटीन में अनुवादित करता है। यह प्रक्रिया किसमें होती है?

(a) माइटोकॉण्ड्रिया

(b) साइटोसोल

(c) न्यूक्लियोप्लाज्म

(d) क्लोरोप्लास्ट

सही पद है/हैं

Read the following statement and inferences, and select the correct option.

Statement: The core of the larger ribosomal subunit, where the catalysis of the peptidyl bond happens between one amino acid and the next, is made up entirely of rRNA.

Inference:

A. rRNA is smaller than proteins and hence can fit in the smallest of crevices

B. rRNA has catalytic capability and hence confers the name ribozyme to ribosome

C. The proteins which make up ribosome do not have a significant role to play in its catalytic activity

Which of the inferences are true?

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Question 2 Select one which is not true for ribosome (a) Made up of two sub-units (b) Form polysome (c) May attach to mRNA (d) Have no role in protein synthesis

Question 2

Select one which is not true for ribosome

(a) Made up of two sub-units (b) Form polysome

(c) May attach to mRNA (d) Have no role in protein synthesis