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CSIR NET Biology — practice by topic

Browse 255 questions across 3 Biology topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Biology topics

Cell Structure (135)Genes and Proteins (62)Biological Macromolecules (58)

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What is released when two monomers join during dehydration synthesis?Read the answer and worked solution →Which set of enzymes breaks carbohydrates down during digestion?Read the answer and worked solution →Glucose monomers are the building units of which three polymers?Read the answer and worked solution →What is the ratio of carbon to hydrogen to oxygen in a carbohydrate?Read the answer and worked solution →

Worked practice questions

What is released when two monomers join during dehydration synthesis?

  1. A phosphate group is released as a byproduct
  2. A hydrogen ion is taken in from the surroundings
  3. A water molecule is released as a byproduct
  4. A water molecule is taken in from the surroundings
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Correct answer: C. A water molecule is released as a byproduct

1. Monomers combine using covalent bonds to form larger polymers. 2. As each bond forms, the monomers release a water molecule as a byproduct. 3. The name dehydration synthesis records exactly this, putting units together while losing water. 4. Taking water in is the opposite reaction, hydrolysis, so the two options about taking water or hydrogen in are wrong. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 3 "Biological Macromolecules", section 3.1 Synthesis of Biological Macromolecules_

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Which set of enzymes breaks carbohydrates down during digestion?

  1. Lipase, amylase, pepsin and cellulase
  2. Sucrase, pepsin, lipase and peptidase
  3. Pepsin, peptidase, trypsin and lipase
  4. Amylase, sucrase, lactase and maltase
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Correct answer: D. Amylase, sucrase, lactase and maltase

1. Each macromolecule class is hydrolysed by its own specific enzymes. 2. Carbohydrates are handled by amylase, sucrase, lactase or maltase. 3. Pepsin, peptidase and trypsin act on proteins, and lipase acts on lipids, so any list carrying them is mixed up. 4. Hydrolysis in the digestive system yields small molecules that intestinal cells can absorb easily. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 3 "Biological Macromolecules", section 3.1 Synthesis of Biological Macromolecules_

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Glucose monomers are the building units of which three polymers?

  1. Starch, glycogen and cellulose
  2. Starch, glycogen and chitin
  3. Starch, cellulose and chitin
  4. Glycogen, cellulose and chitin
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Correct answer: A. Starch, glycogen and cellulose

1. One kind of monomer can be joined in several configurations, giving different polymers. 2. Glucose is the worked example: it builds starch, glycogen and cellulose. 3. Chitin is a different case, because its repeating unit is a modified sugar that carries nitrogen. 4. So any list that includes chitin among the glucose polymers is wrong. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 3 "Biological Macromolecules", section 3.1 Synthesis of Biological Macromolecules_

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