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Standard XII
Biology
Lysosomes
Question

Consider the following statements
(a) Lysosomes keep the cells clean by digesting foreign materials.
(b) Ribosomes are present in eukaryotic cells only.
(c) The ER (endoplasmic reticulum) functions both as passageway for intracellular transport and as a manufacturing surface.
Which of the above statements are correct?
  1. (a) and (b)
  2. (b) and (c)
  3. (a) and (c)
  4. None of the above

A
(b) and (c)
B
(a) and (b)
C
None of the above
D
(a) and (c)
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Solution
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The ribosome is responsible for the synthesis of proteins. It is found in all cells, both; eukaryotic as well as prokaryotic. Lysosomes are the small vesicles containing hydrolytic enzymes for the digestion foreign particles, cell debris and dead or weak cellular component, it cleans the cell by digesting unwanted substance in the cell. The endoplasmic reticulum is the membranous network in the cytoplasm. It involves the formation and transportation of materials like proteins, lipids steroids etc. Thus, the correct answer is option C.

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Similar Questions
Q1
Consider the following statements
(a) Lysosomes keep the cells clean by digesting foreign materials.
(b) Ribosomes are present in eukaryotic cells only.
(c) The ER (endoplasmic reticulum) functions both as passageway for intracellular transport and as a manufacturing surface.
Which of the above statements are correct?
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Q2
The ___________ functions both as a passageway for intracellular transport and as a manufacturing surface.
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Q3
Read the passage and answer the following question.

Ribosomes are the smallest cell organelles which can be seen only through an electron microscope. They are found in both prokaryotic as well as eukaryotic cells. Ribosomes are dense, round bodies which occur freely in the cytoplasm and may remain attached to the surface of the endoplasmic reticulum. Chemically, ribosomes are made up of ribonucleoprotein (in eukaryotic cells, the constituent of the ribosome is 40% protein and 60% ribosomal RNA). Ribosomes help in the process of protein synthesis. They are, therefore, called as the protein factories of the cell.

Ribosomes are found in
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Q4
Consider the following statements.
(A) Plant cells have centrioles which are absent in almost all animal cells.
(B) Ribosomes are the site of protein synthesis.
(C) The middle lamella is a layer mainly of calcium carbonate which holds the different neighbouring cells together.
(D) In an animal cell, steroidal hormones are synthesized by smooth endoplasmic reticulum.

Of the above statements

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Q5
Consider the following statements.
(i) In prokaryotic cells, a special membranous structure formed by the extension of the plasma membrane into the cell is known as polysome.
(ii) The smooth endoplasmic reticulum is the major site for synthesis of glycoproteins.
(iii) RuBisCO is the most abundant protein in the whole of biosphere.
(iv) Mitochondria, chloroplasts and peroxisomes are not considered as part of endomembrane system.
Of the above statements.
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