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NEET • BIOLOGY • CELL-THE UNIT OF LIFE
Cell-the unit of life practice · Hard
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Lipids of plasma membrane
a. Are arranged in a bilayer
b. Have non-polar head and polar tail
c. Are responsible for quasi-fluid nature
a. Are arranged in a bilayer
b. Have non-polar head and polar tail
c. Are responsible for quasi-fluid nature
View answer and explanation
Correct option: C
Only a and c are true
Option C (Only a and c are true) is correct because plasma membrane lipids are arranged in a bilayer and contribute to the quasi-fluid nature of the membrane, but they have polar heads and non-polar tails.
32
Hard
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A widely accepted, improved model of cell membrane is
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Correct option: A
Fluid mosaic model
Option A (Fluid mosaic model) is correct because it is the most widely accepted and improved model of the cell membrane.
33
Hard
33 of 45
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Muramic acid is present in the cell wall of
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Correct option: A
Bacteria
Option A (Bacteria) is correct because muramic acid is a unique component of the peptidoglycan layer in bacterial cell walls.
34
Hard
34 of 45
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+4 | -1
Histone proteins are rich in
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Correct option: B
Arginine and lysine
Option B (Arginine and lysine) is correct because histone proteins are rich in the basic amino acids arginine and lysine, which contribute to their positive charge and interaction with negatively charged DNA.
35
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[A]: Calcium carbonate crystals are callec cystoliths.
[R]: The main body of a cystolith is a cellulose extension of cell wall in which calcium carbonate is deposited.
[R]: The main body of a cystolith is a cellulose extension of cell wall in which calcium carbonate is deposited.
View answer and explanation
Correct option: A
Both A and R are true and R is the correct explanation of A
Option A is correct because cystoliths are indeed calcium carbonate crystals, and they form within a cellulose matrix inside plant cells.
36
Hard
36 of 45
Remembering
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Cell organelles extracted from endosperm of germinating castor beans are?
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Correct option: A
Glyoxysomes
Option A (Glyoxysomes) is correct because glyoxysomes are specialized peroxisomes found in plant cells, particularly in the endosperm of germinating seeds, where they convert stored fats to carbohydrates.
37
Hard
37 of 45
Remembering
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Streaming of cytoplasm within a living cell is
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Correct option: B
Cyclosis
Option B (Cyclosis) is correct because cyclosis refers to the streaming or circulation of cytoplasm within a cell.
38
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Understanding
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Statement I: Green chillies turn red when ripe
Statement II: During ripening of chillies the chloroplasts transform into chromoplasts
Statement II: During ripening of chillies the chloroplasts transform into chromoplasts
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Correct option: A
Both Statement I and II are correct
Both Statement I and II are correct because green chillies do turn red when ripe, and this color change is due to the transformation of chloroplasts into chromoplasts during ripening.
39
Hard
39 of 45
Remembering
+4 | -1
Cell junctions that prevent the leakage of substances across a tissue are
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Correct option: A
Tight junctions
Option A (Tight junctions) is correct because tight junctions form a seal between cells, preventing the leakage of substances across a tissue.
40
Hard
40 of 45
Remembering
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A plant cell without cell wall is called?
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Correct option: B
Protoplast
Option B (Protoplast) is correct because a protoplast is a plant cell that has had its cell wall removed.
41
Hard
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Dutrochet has given the concept about cell in
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Correct option: D
1824
Option D (1824) is correct because Dutrochet proposed that the cell is the fundamental unit of structure in 1824.
42
Hard
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Organelle important in spindle formation during nuclear division is
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Correct option: C
Centriole
Option C (Centriole) is correct because centrioles are involved in the formation of the spindle fibers during cell division in animal cells.
43
Hard
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Remembering
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Which of the following is the first cell of human life ?
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Correct option: D
Synkaryon
Option D (Synkaryon) is correct because it is the diploid cell formed by the fusion of the sperm and egg nuclei during fertilization.
44
Hard
44 of 45
Remembering
+4 | -1
Arrangement of microtubules in a flagellum and a centriole is respectively?
View answer and explanation
Correct option: D
9 + 2 and 9 + 0
Option D (9 + 2 and 9 + 0) is correct because a flagellum has a 9+2 arrangement of microtubules, while a centriole has a 9+0 arrangement.
45
Hard
45 of 45
Remembering
+4 | -1
What is the role of sterol in cell membrane?
View answer and explanation
Correct option: A
Stability
Option A (Stability) is correct because sterols, like cholesterol, help maintain the fluidity and stability of the cell membrane.
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.
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