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Punjab (PTB) · Quarter book test · Free

1st Year Biology 2nd Quarter Book Paper

40 marks · 1 hour · 28 questions. Covers: CHAP 4: Molecular Biology, CHAP 5: Enzymes, CHAP 6: Bioenergetics.

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1st Year Biology 2nd Quarter Book Paper

1st Year · Biology · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 40Time: 1 hour

Q1. Multiple choice questions (Attempt all · 12 × 1 = 12)

  1. How much energy is released by breaking one phosphate bond in ATP?

    1. 2 kcal/mole

    2. 4.6 kcal/mole

    3. 7.3 kcal/mole

    4. 10 kcal/mole

  2. Enzymes are also known as:

    1. Coenzymes

    2. Substrates

    3. Biocatalysts

    4. Metabolites

  3. What enzyme is involved in the synthesis of RNA from DNA?

    1. DNA polymerase

    2. RNA polymerase

    3. Ligase

    4. Helicase

  4. What is the function of the antenna complex in a photosystem?

    1. Produces glucose

    2. Absorbs CO2

    3. Captures light and passes energy to the reaction centre

    4. Breaks water molecules

  5. What is denaturation of an enzyme?

    1. A reversible change in enzyme shape

    2. Permanent loss of enzyme activity due to temperature or pH

    3. Reaction with substrate

    4. Temporary inhibition of active site

  6. Which protein maintains the osmotic concentration of blood?

    1. Fibrinogen

    2. Albumin

    3. Myosin

    4. Tubulin

  7. What molecule receives electrons from PS-I's primary acceptor?

    1. Plastocyanin

    2. ATP

    3. Ferredoxin (FD)

    4. ADP

  8. Why do different types of cells have different sets of enzymes?

    1. Because they all perform the same chemical reactions

    2. Because red blood cells and nerve cells have different chemical reactions

    3. Because enzymes are not important in cells

    4. Because all cells have identical functions

  9. What is a hydrogen bond?

    1. A covalent bond between hydrogen atoms

    2. A weak attraction between polar molecules

    3. A bond between two hydrogen atoms

    4. A bond in metals

  10. What is the first compound formed in the Krebs cycle?

    1. Malic acid

    2. Citric acid

    3. Succinic acid

    4. Acetaldehyde

  11. Which enzyme breaks starch into maltose?

    1. Sucrase

    2. Amylase

    3. Lactase

    4. Cellulase

  12. What makes globular proteins more functional than fibrous ones?

    1. Linear structure

    2. Compact, folded shape

    3. Elasticity

    4. Insolubility

Q2. Short questions (Attempt any 8 of 12 · 8 × 2 = 16)

  1. How many ATP molecules are produced in anaerobic respiration?

  2. What do you mean by hydrolases? Give two examples.

  3. What is the specific heat capacity of water and why is it significant?

  4. What are the reactants and products of photosynthesis?

  5. What are irreversible inhibitors and how do they act?

  6. What are acylglycerols and how are they classified?

  7. What happens when RuBisCO binds oxygen instead of carbon dioxide?

  8. How is the first enzyme regulated in a metabolic pathway?

  9. What is the role of hydrogen bonds in water's surface tension?

  10. What toxic substance is produced in the peroxisome during photorespiration?

  11. What is the mechanism of feedback inhibition?

  12. What are carbohydrates and what does the term mean?

Q3. Long questions (Attempt any 3 of 4 · 3 × 4 = 12)

  1. How is glucose broken down to pyruvic acid in glycolysis?

  2. Distinguish the properties and roles of monosaccharides and classify them.

  3. Describe the effect of temperature on the rate of enzyme action.

  4. Describe and illustrate how photosynthetic pigments are organized in thylakoid membrane?