Molecular Basis Of Inheritance — DPP 8

20 NEET questions from Molecular Basis Of Inheritance, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

Attempt this test free 20 questions · 30 minutes · +80 marks
1
Which was first genetic material?
  1. A RNA
  2. B DNA
  3. C Protein
  4. D Both
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Correct answer: A

2
Select the incorrect statement.
  1. A DNA is genetic material in all organisms except some viruses.
  2. B RNA is genetic material in riboviruses.
  3. C Term 'factor' was used by Mendel.
  4. D DNA is a basic substance which was first identified by Altmann.
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Correct answer: D

DNA is acidic in nature.
3
Read the given statements and select the correct option.
Statement A : Prokaryotes have single origin of replication which is called Ori-c in E.coli
Statement B : QB bacteriophage has RNA as their genetic material.
  1. A Only statement A is incorrect
  2. B Only statement B is incorrect
  3. C Both statements A and B are incorrect
  4. D Both statements A and B are correct
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Correct answer: D

4
Bacterial DNA is associated with
  1. A Few polyamines or basic proteins
  2. B Histone proteins
  3. C No proteins
  4. D Non histone acidic proteins
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Correct answer: A

5
In the genetic code dictionary, how many codons are used to code for all the 20 essential amino acids?
  1. A 20
  2. B 64
  3. C 61
  4. D 60
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Correct answer: C

6
The haploid content of human DNA is
  1. A $3.3 \times 10 ^ { 9 } \mathrm { bp }$
  2. B $3.3 \times 10 ^ { 9 } \mathrm { kbp }$
  3. C $4.6 \times 10 ^ { 6 } \mathrm { bp }$
  4. D 48502 bp
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Correct answer: A

7
The experimental system used in the studies on the discovery of replication of DNA has been
  1. A Drosophila melanogaster
  2. B Pneumococcus
  3. C Escherichia coli
  4. D Neurospora crassa
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Correct answer: C

8
Which one of the following statements is not correct w.r.t. DNA packaging?
  1. A Histones are rich in basic amino acids, lysines and arginines
  2. B Positively charged DNA is wrapped around the negatively charged histone octamer to form a nucleosome
  3. C Linker DNA contains about 80 bp
  4. D Loosely packed chromatins are euchromatin
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Correct answer: B

→ DNA is negatively charged.
→ Histone proteins are positively charged.
9
The DNA chain acting as template for mRNA synthesis has the following order of bases AGCTTCGA. What will be the order of bases in mRNA?
  1. A TCGT AAGCT
  2. B UCTG AAG CU
  3. C UCG UAG CT
  4. D UCG AAG CU
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Correct answer: D

10
DNA replication is aided by
  1. A DNA polymerase only
  2. B DNA ligase only
  3. C Both DNA polymerase and ligase
  4. D RNA polymerase
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Correct answer: C

11
Find out the correct matching
Molecular Basis Of Inheritance – NEET-13336
  1. A a - ii, b - iii, c - iv, d - i
  2. B a - i, b - ii, c - iii, d - iv
  3. C a-iv, b-iii, c-i, d-ii
  4. D a-ii, b-iv, c-iii, d-i
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Correct answer: A

12
Ligase - an ezyme is used for
  1. A joining bits of DNA
  2. B splitting DNA thread into small bits
  3. C denaturation
  4. D none of the above
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Correct answer: A

13
Nucleic acid was artificially synthesized in vitro by-
  1. A Ochoa and Kornberg
  2. B Nirnberg and Ochoa
  3. C Nirenberg and Ochoa
  4. D Kornberg and Nirenberg
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Correct answer: A

14
The enzyme which catalyses the formation of RNA from DNA template is known as
  1. A Reverse transcriptase
  2. B RNA polymerase
  3. C DNA polymerase
  4. D Nucleases
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Correct answer: B

15
Identify the characteristic which is not applicable to the genetic code
  1. A Non-Polar
  2. B Non-overlapping
  3. C Commaless
  4. D Universal
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Correct answer: A

16
A codon is said to be degenerate because
  1. A It degenerates soon after coding
  2. B more than one amino acid can be coded by a single codon
  3. C the same amino acid can have many codons
  4. D all the above
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Correct answer: C

17
In DNA replication, the role of RNA primer is to-
  1. A Activate the DNA template
  2. B Synthesize DNA nucleotides for the formation of new strand
  3. C Initiate the formation of new strand on the template
  4. D Perform all these functions
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Correct answer: C

18
Read the following statements.
(a) During protein synthesis formation of a peptide bonds do not require energy
(b) The UTRS are present at both $5 ^ { \prime }$ and at $3 ^ { \prime }$ end.
(c) The structural gene in a transcription unit could be said as monocstronic mostly in eucaryotes.
How many of above statement are correct.
  1. A One
  2. B Two
  3. C Three
  4. D All are correct
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Correct answer: B

19
Small fragments of DNA synthesized during replication of DNA are called
  1. A Nucleotides
  2. B Genes
  3. C Okazaki fragements
  4. D Single stranded DNA
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Correct answer: C

20
If there are $24 \times 10^{8} \mathrm{bp}$ in an eukaryotic cell, then what will be the number of nucleosomes present in the nucleus?
  1. A $12 \times 10^{6}$
  2. B $12 \times 10^{8}$
  3. C $1.2 \times 10^{8}$
  4. D $2.4 \times 10^{8}$
Show answer & explanation

Correct answer: A

One nucleosome has 200 bp $=\frac{24 \times 10^{8}}{200}=12 \times 10^{6}$ nucleosomes

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