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NEET • BIOLOGY • CELL-THE UNIT OF LIFE
Cell-the unit of life practice · Medium
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Which of the following is characteristic of phospholipids of plasma membrane?
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Correct option: B
One polar head and two non-polar tails
Option B (One polar head and two non-polar tails) is correct because phospholipids have a hydrophilic (polar) head and two hydrophobic (non-polar) fatty acid tails.
92
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92 of 97
Remembering
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The difference between rough endoplasmic reticulum and smooth endoplasmic reticulum is that rough endoplasmic recticulum
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Correct option: B
Contains ribosomes
Option B (Contains ribosomes) is correct because rough endoplasmic reticulum (RER) is characterized by the presence of ribosomes on its surface, which are involved in protein synthesis.
93
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93 of 97
Understanding
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Which of the following statement is incorrect regarding the band region of polytene chromosome?
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Correct option: A
Feulgen negative area
Option A (Feulgen negative area) is correct because the band region of polytene chromosomes is Feulgen positive due to the presence of DNA.
94
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Analyzing
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Assertion (A): Mitochondria and chloroplast are semiautonomous organelles.
Reason (R): These are formed by the division of pre-existing organelles as well as they contain DNA, but lack protein synthesizing machinery.
Reason (R): These are formed by the division of pre-existing organelles as well as they contain DNA, but lack protein synthesizing machinery.
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Correct option: C
If A is true, but R is false
Option B (C, H, O, N) is correct because carbon, hydrogen, oxygen, and nitrogen are the most abundant elements in living systems, making up about 95% of their mass.
95
Medium
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Understanding
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The ratio of centromeres, kinetochores, DNA molecules in a metaphase chromosome?
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Correct option: A
0.043078704
Option A (0.043078704) is correct because the ratio is calculated as 1 centromere : 2 kinetochores : (number of base pairs/number of base pairs per DNA molecule) which results in the given ratio.
96
Medium
96 of 97
Understanding
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According to Singer and Nicolson model of cell membrane
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Correct option: A
The quasi-fluid nature of lipid enables lateral movement of protein within over all bilayer
Option A (The quasi-fluid nature of lipid enables lateral movement of protein within over all bilayer) is correct because the fluid mosaic model describes the lipid bilayer as allowing lateral movement of proteins.
97
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97 of 97
Remembering
+4 | -1
Which chapter of the book , written by Robert Hooke gave birth to cell biology?
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Correct option: A
Observe XVII
Option A (Observe XVII) is correct because this chapter described Hooke's observations of cork cells.
Revision notes and key takeaways
Review CELL-THE UNIT OF LIFE in your textbook or class notes, then use this set to check your understanding.
Showing 91-97 of 97 questions