Biomolecules-2 Set 3

All India Pre Medical Test (AIPMT)

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This set of Biology Multiple Choice Questions & Answers (MCQs) focuses on Biomolecules-2 Set 3

Q1 | A molecule of ATP is structurally most similar to a molecule of?
  • RNA
  • Protein
  • Lipid
  • Amino acid
Answer: RNA
Q2 | Which is the site of protein synthesis?
  • Chromosomes
  • DNA
  • Polysomes
  • Tonoplast
Answer: Polysomes
Q3 | Select the specific base pairs of DNA:
  • Adenine and Cytosine
  • Guanine and Adenine
  • Adenine and Thymine
  • Guanine and Uracil
Answer: Adenine and Thymine
Q4 | The DNA stands are antiparallel because of:
  • Ester bond
  • Phosphodiester bond
  • Disulphide bond
  • Hydrogen bond
Answer: Phosphodiester bond
Q5 | The distance between two chains of DNA molecules is:
  • 34 A°
  • 20 A°
  • 3.4 A°
  • 10 A°
Answer: 20 A°
Q6 | The length of one complete spiral of DNA is:
  • 34 A°
  • 3.4 A°
  • 20 A°
  • 340 A°
Answer: 34 A°
Q7 | Which one of the following bases is found only in RNA and not in DNA?
  • Guanine
  • Adenine
  • Uracil
  • Thymine
Answer: Uracil
Q8 | The scientists who discovered the structure of DNA molecule
  • Miller and mandal
  • Khorana and Nirenberg
  • Calvin and Wilkinson
  • Waston and Crick
Answer: Waston and Crick
Q9 | Mention the example of dinuclotide in the given structure.
  • RNA with UA
  • RNA with CG
  • DNA with TA
  • DNA with CG
Answer: RNA with UA
Q10 | The structure of DNA like a spiral ladder because
  • Purine and Pyrimidine are on the opposite side
  • Purine and Pyrimidine linked with hydrogen bond
  • All nucleotides join through a phosphodiester bond
  • Two polynucleotide chains arranged parallel to each other and are spirally Twisted
Answer: Two polynucleotide chains arranged parallel to each other and are spirally Twisted
Q11 | The hydrogen bonds between adenine and guanine are
  • 2
  • 3
  • 1
Q12 | Which of the following is correct?
  • A=T
  • C=G
  • G=A
  • A=C
Answer: A=T
Q13 | Nitrogen bases do not contain
  • Phosphorus
  • Nitrogen
  • Hydrogen
  • Carbon
Answer: Phosphorus
Q14 | Which one is two ringed nitrogenous base?
  • Thymine
  • Adenine
  • Cytosine
  • Uracil
Answer: Adenine
Q15 | Which of the following ratio is constant in the DNA of all the species?
  • A+U / T+C
  • A+G/ C+T
  • A+C / T+G
  • A+T / C+G
Answer: A+T / C+G
Q16 | m-RNA is the polymer of
  • Ribonucleotide
  • Ribonucleoside
  • Deoxyribonucleotide
  • Ribosome
Answer: Ribonucleotide
Q17 | Which of the following is incorrect?
  • m-RNA is degreased after its function is over
  • t-RNA are synthesized by m-RNA
  • r-RNA is localized in the ribosome
  • m-RNA carries genetic code in to cytoplasm
Answer: t-RNA are synthesized by m-RNA
Q18 | Which is longest of all RNA?
  • m-RNA
  • t-RNA
  • r-RNA
  • None above
Answer: m-RNA
Q19 | The common instant source of energy of cellular activities is
  • Mitochondria
  • DNA
  • RNA
  • ATP
Answer: ATP
Q20 | Which one is known as adapter molecule?
  • DNA
  • m-RNA
  • t-RNA
  • r-RNA
Answer: t-RNA
Q21 | The RNA transporting amino acid to the protein synthesizing site known as
  • t-RNA
  • r-RNA
  • m-RNA
  • Any one of a, b, c
Answer: t-RNA
Q22 | Match the column and find out the correct combinationColumn –I Column –II(P) Keratin (i) co-enzyme(Q) ATP (ii) pyrimidline(R) Cytosine (iii) polynucleotide(S) NAD (iv) Purine(T) Guanine (v) polypeptide
  • P-v, Q-iii, R-ii, S-i, T-iv
  • P-v, Q-iii, R-iv, S-I, T-ii
  • P-iii, Q-v, R-i, S- ii, T-iv
  • P-v, Q-i, R-ii, S-iii, T-iv
Answer: P-v, Q-iii, R-ii, S-i, T-iv
Q23 | Which is the special function of t-RNA?
  • Pick up code for m-RNA and bring it to r-RNA
  • Do protein synthesis
  • Carries the coded genetic information in to the cytoplasm
  • An adapter for attaching amino acid to m-RNA template during Protein synthesis
Answer: An adapter for attaching amino acid to m-RNA template during Protein synthesis
Q24 | Which are proportionally more compounds in all RNA’s?
  • m-RNA
  • t-RNA
  • r-RNA
  • a, b, c all
Answer: r-RNA
Q25 | Which is the part of DNA molecules that varies among DNA molecule
  • Pentose sugar
  • nitrogen base
  • phosphate
  • a & b both
Answer: nitrogen base
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