IGCSE Biology Paper-2: Specimen Questions with Answers 117 - 118 of 203

Question 117

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Question

MCQ▾

Which element is found in proteins but not carbohydrates?

Choices

Choice (4)
a.Carbon
b.Hydrogen
c.Oxygen
d.Nitrogen

Answer

d.

Explanation

  • Protein name is derived from a Greek word proteioses, which means, “holding first place. “
  • Essential elements in protein are C, H, O, N, (sulphur is also present in less amount)
  • After water, proteins are most abundant compounds in protoplasm. Amount of proteins is different in different sources - in muscle, 7 % in blood plasma, in cow milk, in cereal grain, in nuts and pulses, in white part of egg. in yellow part of egg.
  • Different elements in simple proteins have following proportion-
    • Carbon- Hydrogen- Oxygen- , Nitrogen- Sulphur
    • Caloric value - 5.6 kcal/gm
    • Daily requirement - 70 - 100gm
    • Proteins are polymer of amino acid.

Question 118

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Question

MCQ▾

Cell division has the following functions.

1. Growth

2. Production of gametes

3. Asexual reproduction

4. Replacement of cells

5. Repair of damaged tissue

Which functions are specific to mitosis?

Choices

Choice (4)
a.2,3, 4, and 5
b.1,2, 4, and 5
c.1,3, 4, and 5
d.Question does not provide sufficient data or is vague

Answer

c.

Explanation

Mitosis:

  • The equation division is a common division method for the diploid cells only. However, some lower plants and social insects, which have haploid cells, also use mitosis for division. The significance of this division is essential to understand in the life of an organism.
  • Mitosis results in the production of diploid daughter cells, which have identical genetic chromosome number. The multicellular organisms grow due to the mitosis.
  • Cell growth often results in disturbing the usual ratio of the nucleus and the cytoplasm. Thus, the cell divides and restores the nucleo-cytoplasmic ratio.
  • A very significant contribution is that a cell is repaired. Best examples are the cells of the upper epidermis layer, cells of the gut lining, and blood cells being replaced constantly.