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RNA

Select the co...

Question

Select the correct option stating true(T) and flase(f) W.r.t ribosomes
(A) protein synthesis in eukaryotic cell occurs in the ribosomes of nucleus.
(B) Ribosomes are the granular structure first observed under the electron microscope.
(C) The sedimentation coefficient is indirect measure of density and size.

A

(A) T (B) T (C) T

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B

(A) f (B) f (C) f

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C

(A) T (B) F (C) T

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D

(A) F (B) T (C) T

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Solution

The correct option is D (A) F (B) T (C) T
A is false because protein synthesis occurs in cellular structures called ribosomes, found outside the nucleus. The process by which genetic information is transferred from the nucleus to the ribosomes is called transcription. During transcription, a strand of ribonucleic acid (RNA) is synthesized.”
B is true and C is true

So the correct answer is D, (A) F (B) T (C) T.

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Q. Several antibiotics exert their action by targeting the unique protein synthesis processes in bacteria. They exploit the differences between prokaryotic and eukaryotic translation mechanisms to selectively inhibit protein synthesis in bacteria without affecting the eukaryotic host.
Ribosomes are a specific target of some antibiotics since there is a significant difference in size and structure between eukaryotic and prokaryotic ribosomes: eukaryotic ribosomes consist of a 60S subunit and a 40S subunit, whereas prokaryotic ribosomes are composed of 30S and 40S subunits.
Tetracycline is a common antibiotic that works at the level of protein synthesis in bacteria.
Which of the following provides the best explanation for the effectiveness of Tetracycline as an antibiotic in eukaryotic cells?

Read the passage and answer the following question.

Ribosomes are the smallest cell organelles which can be seen only through an electron microscope. They are found in both prokaryotic as well as eukaryotic cells. Ribosomes are dense, round bodies which occur freely in the cytoplasm and may remain attached to the surface of the endoplasmic reticulum. Chemically, ribosomes are made up of ribonucleoprotein (in eukaryotic cells, the constituent of the ribosome is 40% protein and 60% ribosomal RNA). Ribosomes help in the process of protein synthesis. They are, therefore, called as the protein factories of the cell.

Ribosome is made up of

Q. Ribosome units are synthesised in a eukaryotic cell inside

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. Consider the following four statements (a-6) and H._ select the option which includes all the correct ones only:-
(a) Ribosomes are the granular structure first observed by George Palade.
(b) Both the centrioles in a centrosome lie perpendicular to each other.
(c) A single human cell has approximately 2.2 meter long thread of DNA distributed in one chromosomes.
(d) Material of the nucleus (chromatin) stained by the only acidic dyes.

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