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 2 of 4
Cell The Unit Of Life
Match the following columns and select the correct option:
Column-I
Column-II
(A)Smooth endoplasmic reticulum
(I)Protein synthesis
(B)Rough endoplasmic reticulum
(II)Lipid synthesis
(C)Golgi complex
(III)Glycosylation
(D)Centriole
(IV)Spindle formation
A (A)-(II), (B)-(I), (C)-(III). (D)-(IV) B (A)-(III), (B)-(I), (C)-(II), (D)-(IV) C (A)-(IV), (B)-(II), (C)-(I), (D)-(III) D (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
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Cell The Unit Of Life
Which of the following elements helps in maintaining the structure of ribosomes?
A Magnesium B Zinc C Copper D Molybdenum
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AI-generated explanation. Check against your textbook.
Explanation: Magnesium (Mg2+) helps maintain the structure of ribosomes by stabilizing rRNA and ribosomal subunits, which is essential for proper protein synthesis. This is in line with NCERT, which notes the importance of Mg2+ in ribosome stability during translation. The other elements—Zinc, Copper, and Molybdenum—are involved in different cellular functions (enzymes and electron transport) but are not described as maintaining ribosome structure in NCERT.
🧠 Did You Know? Ribosomes require divalent cations like magnesium to maintain their shape and function during protein production.
💡 NCERT Memory Line: Magnesium stabilizes ribosomal structure for translation.
Cell The Unit Of Life
Which is the important site of formation of
glycoproteins and glycolipids in eukaryotic cells?
A Endoplasmic reticulum B Peroxisomes C Golgi bodies D Polysomes
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Cell The Unit Of Life
The concept of "Omnis cellula-e cellula" regarding
cell division was first proposed by:
A Theodore Schwann B Schleiden C Rudolf Virchow D Aristotle
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Cell The Unit Of Life
Which of the following pair of organelles does not
contain DNA:
A Mitochondria and Lysosomes B Chloroplast and Vacuoles C Nuclear envelope and Mitochondria D Lysosomes and Vacuoles
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Cell The Unit Of Life
The shorter and longer arms of a submetacentric
chromosome are referred to as:
A p-arm and q-arm respectively
B s-arm and l-arm respectively C q-arm and p-arm respectively D m-arm and n-arm respectively
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Cell The Unit Of Life
Which of the following statements regarding
mitochondria is incorrect?
A Mitochondrial matrix contains single circular
DNA molecule and ribosomes. B Inner membrane is convoluted with infoldings. C Enzymes of electron transport are embedded
in outer membrane. D Outer membrane is permeable to monomers of
carbohydrates fats and proteins.
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Cell The Unit Of Life
Which of the following statements is not correct?
A Lysosomes have numerous hydrolytic enzymes. B The hydrolytic enzymes of lysosomes are active
under acidic pH. C Lysosomes are membrane bound structures. D Lysosomes are formed by the process of packaging in the endoplasmic reticulum.
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Cell The Unit Of Life
Match List-I with List-II.
List-I
List-II
(A)Nucleolus
(I)Site of formation of glycolipid
(B)Centriole
(II)Organization like the cartwheel
(C)Leucoplasts
(III)Site for active ribosomal RNA synthesis
(D)Golgi apparatus
(IV)For storing nutrients
Choose the correct answer from the options given
below:
A A-III, B-IV, C-II, D-I B A-I, B-II, C-III, D-IV C A-II, B-III, C-I, D-IV D A-III, B-II, C-IV, D-I
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Cell The Unit Of Life
The DNA present in chloroplast is:
A Circular, double stranded B Linear, double stranded C Circular, single stranded D Linear, single stranded
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Explanation: NCERT Page No.136,(Topic-8.5.5 Plastids)
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