Class XI · Biology practice
Cell the Unit of Life PYQs Check your understanding, bookmark questions and revisit your mistakes.
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31 questions in this collection · Page 3 of 4
Cell The Unit Of Life
Endomembrane system includes _______.
A endoplasmic reticulum, Golgi complex, lysosomes and vacuole B endoplasmic reticulum, chloroplast, peroxisomes and vacuole C mitochondria, chloroplast, peroxisomes and vacuole D Golgi complex, chloroplast, peroxisomes and vacuole
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The endomembrane system comprises the endoplasmic reticulum, Golgi apparatus, lysosomes and vacuoles.
Cell The Unit Of Life
Smooth endoplasmic reticulum _______.
A has ribosomes attached to its surface B is the major site for the synthesis of lipids C is actively involved in protein synthesis D is a site for the synthesis of carbohydrates
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Smooth endoplasmic reticulum lacks ribosomes and is primarily responsible for lipid synthesis and detoxification.
Cell The Unit Of Life
Cell theory was formulated by ________.
A Schleiden and Schwann B Robert Brown C Singer and Nicolson D Antonie van Leeuwenhoek
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Matthias Schleiden and Theodor Schwann proposed the cell theory. Rudolf Virchow later modified it by stating that all cells arise from pre-existing cells.
Cell The Unit Of Life
Which of the following are characteristics of prokaryotic cells?
A (b) and (c) only B (a) and (c) only C (a), (c) and (d) only D (a), (b) and (c) only
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Prokaryotes possess 70S ribosomes (50S + 30S), plasmids and mesosomes, but they lack membrane-bound organelles such as peroxisomes.
Cell The Unit Of Life
Mitochondrial inner membrane encloses _________.
A Matrix B Cytosol C Mucus D Aqueous humor
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The inner mitochondrial membrane encloses the mitochondrial matrix, which contains enzymes of the Krebs cycle, mitochondrial DNA and ribosomes.
Cell The Unit Of Life
Match List-I with List-II:
List-I List-II A. Cristae I. Flat membrane sacs in stroma of chloroplast B. Cisternae II. Infoldings in mitochondria C. Thylakoids III. Cell membrane D. Phospholipid IV. Disc-shaped sacs in the Golgi apparatus
A A-III, B-IV, C-I, D-II B A-II, B-IV, C-I, D-III C A-II, B-IV, C-III, D-I D A-IV, B-III, C-I, D-II
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Cristae are infoldings of the inner mitochondrial membrane. Cisternae are flattened sacs of the Golgi apparatus. Thylakoids are membrane sacs in chloroplasts. Phospholipids are major components of cell membranes.
Cell The Unit Of Life
The plastid that stores xanthophyll is known as
A Chloroplast B Chromoplast C Aleuroplast D Amyloplast
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Chromoplasts contain carotenoid pigments such as carotene and xanthophyll, giving yellow, orange and red colours to plant parts.
Cell The Unit Of Life
Which one of the following is the site for active ribosomal RNA synthesis?
A Nucleolus B Kinetochore C Centrosome D Chromatin
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The nucleolus is the site of ribosomal RNA (rRNA) synthesis and ribosome assembly.
Cell The Unit Of Life
Non-membrane bound cell organelles found in both prokaryotic and eukaryotic cells are _________.
A Lysosomes B Centrosomes C Mitochondria D Ribosomes
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Ribosomes are non-membrane-bound organelles present in both prokaryotic and eukaryotic cells where protein synthesis occurs.
Cell The Unit Of Life
Select the correct statements regarding cell membrane in eukaryotic cell.
A C, D and E only B B, C and E only C A, B, D and E only D A, C, D and E only
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Human RBC membrane contains about 52% protein. Phospholipids form a bilayer with hydrophobic tails inward, glycocalyx is present externally, whereas mesosomes are found only in prokaryotes.
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