Biology · Chapter 2 of 19

Biomolecules & DNA/RNA: BPSC & UPPCS Prelims PYQs

11 previous-year questions on Biomolecules & DNA/RNA. Each one opens to its answer and explanation.

1. 1. 71st BPSC Prelims 2025

   Which of the following is a non-sense codon?

   1. AAUG
   2. BUAA
   3. CUUU
   4. DUGC
   Answer and explanation →

2. 2. UPPSC Prelims 2025

   Consider the following elements found in a typical 70 kg man and arrange them in correct increasing order.
   1. Sodium 2. Potassium 3. Copper 4. Iron Select the correct answer from the code given below:

   1. A4, 3, 2, 1
   2. B3, 4, 1, 2
   3. C3, 4, 2, 1
   4. D4, 3, 1, 2
   Answer and explanation →

3. 3. 69th BPSC Prelims 2023

   What is the expanded form of the term ‘mRNA’ that has been widely discussed since the beginning of the pandemic?

   1. AMessenger Ribonucleic Acid
   2. BMutant Ribonucleic Acid
   3. CModified Ribonucleic Acid
   4. DMnemonic Ribonucleic Acid
   Answer and explanation →

4. 4. 67th BPSC Prelims 2022

   Most of the enzymes are

   1. Alipids
   2. Bacids
   3. Calkalis
   4. Dproteins
   5. ENone of the above/More than one of the above
   Answer and explanation →

5. 5. UPPSC Prelims 2020

   Which of the following natural substances contains iron (Fe)?

   1. AChlorophyll
   2. BCollagen
   3. CKeratin
   4. DMyoglobin
   Answer and explanation →

6. 6. UPPSC Prelims 2019

   Which of the following statements about enzymes is/are correct?
   1. They are biocatalysts.
   2. They perform their action on the site where they are produced. Select the correct answer from the codes given below:

   1. A1 only
   2. B2 only
   3. CBoth 1 and 2
   4. DNeither 1 nor 2
   Answer and explanation →

7. 7. UPPSC Prelims 2019

   Which of the following substances is NOT a protein?

   1. ACotton
   2. BHair
   3. CSpider silk
   4. DHoof
   Answer and explanation →

8. 8. UPPSC Prelims 2018

   Double-helical structure of DNA was given by whom?

   1. AJacob and Monod
   2. BWatson and Crick
   3. CH.G. Khorana
   4. DNone of the above
   Answer and explanation →

9. 9. UPPSC Prelims 2016

   Which one of the following food materials contains all essential amino acids?

   1. ARice
   2. BMilk
   3. CEgg
   4. Dmore than one of the above
   Answer and explanation →

10. 10. 56th–59th BPSC Prelims 2014

    Who synthesized the DNA in Vitro?

    1. AArthur Kornberg
    2. BRobert Hooke
    3. CEdward Jenner
    4. DJoseph Lister
    Answer and explanation →

11. 11. UPPSC Prelims 2012

    Who had proposed for the first time the double helix model of DNA?

    1. AWatson and Crick
    2. BFisher and Haldane
    3. CLamarck and Darwin
    4. DHugo de Vries
    Answer and explanation →