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NEET • BIOLOGY • CELL-THE UNIT OF LIFE
Cell-the unit of life practice · Easy
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61
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A biomembrane consists of lipids, proteins carbohydrates and water. These lipid molecules are
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Correct option: D
All of the above
Option D (All of the above) is correct because lipid molecules in biomembranes are amphipathic, having both polar and non-polar ends.
62
Easy
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+4 | -1
Choose the correct statement w.r.t. E. coli
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Correct option: C
DNA in nucleoid is organised in large loops
Option C (DNA in nucleoid is organised in large loops) is correct because in E. coli, the DNA is organized into loops within the nucleoid region.
63
Easy
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Remembering
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Fluid mosaic model was given by
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Correct option: C
Singer and Nicolson
Option C (Singer and Nicolson) is correct because the fluid mosaic model of the cell membrane was proposed by Singer and Nicolson in 1972.
64
Easy
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Remembering
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The study related to the structure and function of a cell is called
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Correct option: B
Cytology
Option B (Cytology) is correct because cytology is the branch of biology concerned with the structure and function of cells.
65
Easy
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Remembering
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The type of ribosomes found in prokaryotes is
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Correct option: A
70S type
Option A is correct because prokaryotes contain 70S ribosomes, which are composed of 30S and 50S subunits.
66
Easy
66 of 77
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Protoplasm of a eukaryotic cell is called
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Correct option: B
Protoplast
Option C (Cytoplasm) is correct because the protoplasm of a eukaryotic cell excluding the nucleus is called cytoplasm. Protoplast includes the nucleus.
67
Easy
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Remembering
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The two polynucleotide chains in DNA are
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Correct option: C
Antiparallel
Option C (Antiparallel) is correct because the two strands of DNA run in opposite directions (5' to 3' and 3' to 5').
68
Easy
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Remembering
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Glycocalyx (mucilage sheath) of a bacterial cell may occur in the form of a loose sheath called …A… or it may be thick and tough called …B… Choose the correct pair from the given option
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Correct option: B
A-slime layer, B-capsule
Option B (A-slime layer, B-capsule) is correct because the glycocalyx can be a loose slime layer or a thick, tough capsule.
69
Easy
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Chromosome number is
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Correct option: A
Fixed for a species
Option A (Fixed for a species) is correct because the number of chromosomes is a characteristic feature of a species.
70
Easy
70 of 77
Remembering
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Study of form, structure and composition of cells is called
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Correct option: B
Cytology
Option B (Cytology) is correct because cytology is the study of the structure and function of cells.
71
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Understanding
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Plasma membrane helps in
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Correct option: C
Osmoregulation
Option C (Osmoregulation) is correct because the plasma membrane regulates the movement of water and solutes, maintaining osmotic balance.
72
Easy
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Quantasomes are found in
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Correct option: B
Chloroplast
Option B (Chloroplast) is correct because quantasomes are photosynthetic units found within the thylakoid membranes of chloroplasts.
73
Easy
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Remembering
+4 | -1
When the centromere is present very close to one end of the chromosome, the chromosome is referred to as
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Correct option: C
Acrocentric
Option C is correct because an acrocentric chromosome has the centromere located very close to one end, resulting in one very short arm and one long arm.
74
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Part of chromosome after secondary constriction is called
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Correct option: D
Satellite
Option D (Satellite) is correct because the part of the chromosome after the secondary constriction is called the satellite.
75
Easy
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Understanding
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Statement I: Nucleosome constitute the repeating unit a structure in nucleus called chromatin.
Statement II: Nucleosome in chromatin are seen as 'beads - on - string structure when viewed under electron microscope.
Choose the correct answer from the options given below:
Statement II: Nucleosome in chromatin are seen as 'beads - on - string structure when viewed under electron microscope.
Choose the correct answer from the options given below:
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Correct option: D
Both, Statement I and Statement II are correct
Option D (Both, Statement I and Statement II are correct) is correct because nucleosomes are the repeating units of chromatin structure, and they appear as \'beads-on-a-string\' under an electron microscope.
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76
Easy
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Understanding
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Which of the following feature is common to prokaryotes and many eukaryotes?
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Correct option: A
Cell wall is present
Option A is correct because both prokaryotes and many eukaryotes (like plants and fungi) possess a cell wall.
77
Easy
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Remembering
+4 | -1
…… are an exception to cell theory
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Correct option: C
Viruses
Option C (Viruses) is correct because viruses are not cells and require a host cell to replicate, thus not adhering to all tenets of the cell theory.
Revision notes and key takeaways
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