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Many ribosomes may associate with a sing...

Many ribosomes may associate with a single mRNA to form mutiple copies of a poolypeptide simultaneously. Such strings of ribosomes are termed as

A

Polysomes

B

Plastidomes

C

Polyhedral bodies

D

Nucleosomes

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The correct Answer is:
A
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Several ribosomes may attach to a single mRNA and form a chain called

Assertion (A) : DNA code is copied in the synthesis of m-RNA. Reason ( R ) : t-RNA moves out of nucleus and after attaching on ribosomes form the template.

The following features occur during protein synthesis: (a) Movement of mRNA from the nucleus into the cytoplasm, where it binds to the ribosomes (b) Formation of tRNA-amino acid complex (c) Transcription of specific segments of DNA into mRNA molecules in the nucleus (d) Binding of N-terminal amino acid, methionine tRNA to the 'P' site of the ribosome. The tRNA anticodon 'pairs with AUG on mRNA' (e) Formation of peptide bond between first and second amino acids at the A site (f) Release of the complete polypeptide chain from mRNA and the ribosomes (g) Migration of dipeptide to form a tripeptide and then a polypeptide The correct order of events is:

MODERN PUBLICATION-CELL : THE UNIT OF LIFE -COMPETITION FILE ( OBJECTIVE TYPE QUESTIONS ( A. MULTIPLE CHOICE QUESTIONS ( MCQs):))
  1. Which of the below mentioned properties is not true with respect to fa...

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  2. Which of the below mentioned structures do not form a part of the endo...

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  3. Chloroplasts in higher plants are shaped :

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  4. They help in respiration , They help in cell wall formation They h...

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  5. A cell organelle containing hydrolytic enzymes is

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  6. Which of the following rRNAs acts as structural RNA as well as ribozym...

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  7. Mitochondria and chloroplast are (a) Semi-autonomous organelles (...

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  8. Water soluble pigments found in plant cell vacuoless are

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  9. Which of the following is not a feature of the plasmids

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  10. A complex of ribosomes attached to a single strand of RNA is known as

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  11. Microtubules are the constituents of

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  12. Which one of the following cell organelles is enclosed by a single mem...

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  13. Which among the following are the smallest living cells, known without...

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  14. Which of the following cell organelles is responsible for extracting e...

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  15. Which of the following RNAs should be most abundant in animal cell

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  16. The Golgi complex participates in

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  17. Which of the following is true for nucleolus?

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  18. Which of the following events does not occur in rough endoplasmic reti...

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  19. Select the incorrect match:

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  20. Many ribosomes may associate with a single mRNA to form mutiple copies...

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