IGCSE Biology Paper-3: Specimen Questions with Answers 90 - 93 of 358

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Passage

This is the structure of ribosome.

Image Shows Structure of Ribosome

Question 90 (1 of 2 Based on Passage)

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Short Answer▾

What are the main functions of ribosomes?

Explanation

They assemble amino acids to form specific proteins, proteins are essential to carry out cellular activities.

The proteins that are synthesized by the ribosomes present in the cytoplasm are used in the cytoplasm itself. The proteins produced by the bound ribosomes are transported outside the cell.

Question 91 (2 of 2 Based on Passage)

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Name the unit A and B.

Explanation

A- 30 S ribosome

B- 70 S ribosome

Question 92

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In hemophilia minor wound may result in fatal bleeding. What is the reason behind rare hemophilic women?

Explanation

There are more hemophilic male than hemophilic female because female need to have two affected X chromosomes to this disease, and in male, the disease is present when there is single X chromosome is affected.

Question 93

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Table shows one difference between plant cell and animal cell. Complete Table by listing three more differences.

Given Table Shows a One Difference between Plant Cells and Animal Cells
Plant CellAnimal cell
  1. Cell wall present
  1. Cell wall absent
________________
________________
________________

Explanation

Given Table Shows a Three Other Differences between Plant Cells and Animal Cells
Plant CellAnimal cell
1. Cell wall present1. Cell wall absent
2. Plant cell has chloroplast which contain chlorophyll2. Does not have chloroplast
3. Plant cells are larger than animal cell3. Animal cells are generally small in size
4. Plant cells lack centrosome and centrioles4. Animal cell have centrosome and centrioles

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