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Molecular Basis of Inheritance · Question 68

NEET 2018MCQEasy📈 Topic in 38% papers+4−1
1

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

  1. polysome
  2. polyhedral bodies
  3. plastidome
  4. nucleosome

Answer

(1) polysome

Solution

As per NCERT, several ribosomes may attach to a single mRNA and form a chain called polyribosome or polysome; these ribosomes translate the mRNA into proteins simultaneously.

A nucleosome is the unit of chromatin (DNA wrapped around a histone octamer), plastidome is the total plastids of a cell, and polyhedral bodies are viral inclusion bodies.

Answer: (1)

NEET 2018

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2

AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA?

  1. AGGUAUCGCAU
  2. UGGTUTCGCAT
  3. ACCUAUGCGAU
  4. UCCAUAGCGUA
NEET 2018
3

All of the following are part of an operon except

  1. an operator
  2. structural genes
  3. an enhancer
  4. a promoter
NEET 2018
4

The final proof for DNA as the genetic material came from the experiments of

  1. Griffith
  2. Hargobind Khorana
  3. Avery, MacLeod and McCarty
  4. Hershey and Chase
NEET 2017
5

If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered ?

  1. 1
  2. 11
  3. 333
  4. 33
NEET 2017
6

During DNA replication, Okazaki fragments are used to elongate

  1. The leading strand away from replication fork
  2. The lagging strand towards replication fork
  3. The lagging strand away from the replication fork
  4. The leading strand towards replication fork
NEET 2017
7

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

  1. m-RNA
  2. mi-RNA
  3. r-RNA
  4. t-RNA
NEET 2017
8

Spliceosomes are not found in cells of :

  1. Bacteria
  2. Plants
  3. Animals
  4. Fungi
NEET 2017
9

The association of histone H1 with a nucleosome indicates :

  1. DNA replication is occurring
  2. Transcription is occurring
  3. The DNA is condensed into a Chromatin Fibre
  4. The DNA double helix is exposed
NEET 2017
10

Which one of the following is the starter codon ?

  1. AUG
  2. UAG
  3. UAA
  4. UGA
NEET 2016 (Phase 1)
11

Which of the following is required as inducer(s) for the expression of Lac operon?

  1. lactose
  2. lactose and galactose
  3. glucose
  4. galactose
NEET 2016 (Phase 1)

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