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NEET UG Biomolecules — practice questions — page 3

Explore 116 free Biomolecules questions in NEET UG Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Biomolecules questions and exercises with answers

Showing questions 61–90 of 116.

Lecithin belongs to which class of lipids?Read the answer and worked solution →What is a nitrogen base joined only to a sugar called?Read the answer and worked solution →Which pair of nitrogen bases are substituted purines?Read the answer and worked solution →DNA is named after which sugar present in it?Read the answer and worked solution →Which is NOT a part of a nucleotide?Read the answer and worked solution →Morphine and codeine belong to which group of secondary metabolites?Read the answer and worked solution →Abrin and ricin are examples of which kind of secondary metabolite?Read the answer and worked solution →Which statement about secondary metabolites is true?Read the answer and worked solution →Why do lipids settle in the acid-insoluble fraction?Read the answer and worked solution →What molecular weight range is typical of proteins and nucleic acids?Read the answer and worked solution →Why is a protein called a heteropolymer?Read the answer and worked solution →What makes an amino acid essential for humans?Read the answer and worked solution →Which is the most abundant protein in the animal world?Read the answer and worked solution →Counting all life on Earth, which protein occurs in the greatest amount?Read the answer and worked solution →What is the function of the protein GLUT-4?Read the answer and worked solution →Cellulose is a homopolymer of which monosaccharide?Read the answer and worked solution →Inulin is a polymer made of which sugar?Read the answer and worked solution →Which polysaccharide stores energy in animal cells?Read the answer and worked solution →Why does starch turn blue with iodine?Read the answer and worked solution →Which complex polysaccharide forms arthropod exoskeletons?Read the answer and worked solution →Which type of helix is observed in proteins?Read the answer and worked solution →The arrangement of separate folded subunits relative to one another is which protein structure?Read the answer and worked solution →How many subunits make up adult human haemoglobin?Read the answer and worked solution →What are nucleic acids that act like enzymes called?Read the answer and worked solution →What is the active site of an enzyme?Read the answer and worked solution →As a rule of thumb, reaction rate doubles or halves for every change of how many degrees C?Read the answer and worked solution →Under anaerobic conditions, what does glucose breakdown give in skeletal muscle?Read the answer and worked solution →What does the glucose pathway produce in yeast during fermentation?Read the answer and worked solution →Activation energy is the energy gap between the substrate and what?Read the answer and worked solution →Who proposed the induced fit model of enzyme action in 1958?Read the answer and worked solution →

Worked practice questions

Lecithin belongs to which class of lipids?

  1. Triglycerides
  2. Fatty acids
  3. Phospholipids
  4. Monoglycerides
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Correct answer: C. Phospholipids

Lecithin contains phosphorus and a phosphorylated compound, which places it among the membrane phospholipids.

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What is a nitrogen base joined only to a sugar called?

  1. Nucleotide
  2. Nucleoside
  3. Nucleic acid
  4. Polynucleotide
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Correct answer: B. Nucleoside

A base attached to a sugar is a nucleoside; esterifying a phosphate to the sugar makes it a nucleotide.

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Which pair of nitrogen bases are substituted purines?

  1. Adenine and guanine
  2. Cytosine and thymine
  3. Uracil and cytosine
  4. Thymine and uracil
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Correct answer: A. Adenine and guanine

Adenine and guanine are purines, while cytosine, thymine and uracil are pyrimidines.

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