Biological Molecules MCQs for MDCAT Practice

Biology section, Biological Molecules chapter. Sample questions from past PMC papers.

1. Question 1
   Phosphatidic acid is composed of:
   • A.2 glycerol, 2 fatty acids & 1 phosphoric acid
   • B.2 glycerol, 1 fatty acids & 1 phosphoric acid
   • C.1 glycerol, 2 fatty acids & 1 phosphoric acid
   • D.2 glycerol, 1 fatty acids & 2 phosphoric acid
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2. Question 2
   Poly A tail:
   • A.Core enzyme
   • B.U ribonucleotide
   • C.3' end
   • D.Sigma factor
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3. Question 3
   In the ground state of a cobalt atom there are _______ unpaired electrons and the atom is _______.
   • A.5, paramagnetic
   • B.2, diamagnetic
   • C.0, diamagnetic
   • D.3, paramagnetic
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4. Question 4
   The DNA of an elephant and the DNA of a cherry tree will probably differ in all of the following respects EXCEPT the:
   • A.Kinds of genes for which the DNA codes
   • B.Number of DNA molecules
   • C.Length of DNA molecules
   • D.Kinds of nucleotides utilized in forming DNA
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5. Question 5
   Which one of the following is a correct sequence in biological methods?
   • A.Observations - Hypothesis - Law - Theory
   • B.Observations - Hypothesis - Deduction - Experimentation
   • C.Hypothesis - Observations - Deduction - Experimentation
   • D.Law - Theory - Deduction - Observations
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6. Question 6
   The data presented by Erwin Chargaff suggested that:
   
   • A.Adenine and Guanine are equal
   • B.Guanine and thymine are equal
   • C.Adenine and cytosine are equal
   • D.Adenine and thymine are equal and so are cytosine and guanine
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7. Question 7
   Among the following edible fishes, which one is a marine fish having a rich source of omega­-3 fatty acids?
   • A.Mystus
   • B.Mangur
   • C.Mrigala
   • D.Mackerel
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8. Question 8
   A haemoglobin molecule consists of ____ amino acids:
   • A.874
   • B.474
   • C.674
   • D.574
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