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Q. No.What would be true regarding the names of chromosomes described in the given table?
I:
Centromere placement very close to the top, p arms not visible
II:
q arms are much longer than the p arms.
III:
p and q arms are very close in length but not equal.
IV:
p and q arms are equal in length.
A:
I is Acrocentric and II is Telocentric
B:
III is Metacentric and IV is Sub-metacentric
C:
I is Telocentroic and II is Acrocentric
D:
III is sub-metacentric and IV is Metacentric
1. A and B only
2. A and C only
3. C and D only
4. B and D only
Subtopic: Nucleus: Chromosomes |
90%
From NCERT
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Consider the given two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is incorrect; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is correct; Statement II is incorrect
| Statement I: | Mature sieve tube elements of vascular plants and mature human erythrocytes are not considered as ‘living’ cells. |
| Statement II: | Mature sieve tube elements of vascular plants and mature human erythrocytes lack a nucleus. |
1. Statement I is correct; Statement II is correct
2. Statement I is incorrect; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is correct; Statement II is incorrect
Subtopic: Nucleus |
69%
From NCERT
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Unless specifically stained, which of the following is not easily visible under the light microscope in a typical eukaryotic cell?
1. Chloroplast
2. Mitochondria
3. Nucleus
4. Endoplasmic reticulum
1. Chloroplast
2. Mitochondria
3. Nucleus
4. Endoplasmic reticulum
Subtopic: Mitochondria |
82%
From NCERT
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Identify the incorrectly matched pair:
1. Only I
2. Only II, III and IV
3. None, all are correctly matched
4. Only III and IV
| I | Chloroplasts | contain chlorophyll and carotenoid pigments |
| II | Amyloplasts | store carbohydrates |
| III | Elaioplasts | store oils and fats |
| IV | Aleuroplasts | store proteins |
2. Only II, III and IV
3. None, all are correctly matched
4. Only III and IV
Subtopic: Plastids |
86%
From NCERT
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The isolated lysosomal vesicles have been found to be very rich in:
1. phosphate and chloride ions
2. cytoprotective pigment molecules
3. lymphokines like interleukins and interferons
4. acid hydrolases
Subtopic: Lysosomes |
93%
From NCERT
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Plant and animal cells are different as:
I: Plant cells possess cell walls which is absent from animal cells.
II: Plant cells possess plastids and a large central vacuole which are absent in animal cells.
III: Plant cells have centrioles which are absent in almost all animal cells
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Eukaryotic Cell Architecture: Types |
92%
From NCERT
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Identify the statement that correctly describes the amount of DNA in a typical somatic cell of human body?
| 1. | A single human cell has approximately one metre long thread of DNA distributed among its twenty three (one set) chromosomes. |
| 2. | A single human cell has approximately two metre long thread of DNA distributed among its twenty three (one set) chromosomes. |
| 3. | A single human cell has approximately two metre long thread of DNA distributed among its forty six (twenty three pairs) chromosomes. |
| 4. | A single human cell has approximately one metre long thread of DNA distributed among its forty six (twenty three pairs) chromosomes. |
Subtopic: Nucleus: Chromosomes |
83%
From NCERT
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Identify the incorrectly matched pair:
| Structure | Size range | |
| 1. | Perinuclear space | 10 – 50 nm |
| 2. | Length of chloroplasts | 2 – 5 µm |
| 3. | Typical eukaryotic cell | 10 – 20 µm |
| 4. | Typical bacterium | 1 – 2 µm |
Subtopic: Plastids |
61%
From NCERT
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The arrangement of axonemal microtubules in cilia and flagellum is referred to as 9 + 2 array which essentially means that the axoneme has:
| 1. | nine doublets of radially arranged peripheral microtubules and two doublets of centrally located microtubules enclosed by a central sheath. |
| 2. | nine triplets of radially arranged peripheral microtubules and a pair of centrally located microtubules enclosed by a central sheath. |
| 3. | nine triplets of radially arranged peripheral microtubules and a centrally located protein hub not enclosed by a central sheath. |
| 4. | nine doublets of radially arranged peripheral microtubules and a pair of centrally located microtubules enclosed by a central sheath. |
Subtopic: Cilia & Flagella |
68%
From NCERT
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Ribosomes:
1. are 70 S in prokaryotes having two subunits 30 S and 40 S.
2. are bound by a single membrane only in eukaryotes.
3. are composed of RNA and proteins.
4. are sites of protein synthesis in eukaryotes but not in prokaryotes.
1. are 70 S in prokaryotes having two subunits 30 S and 40 S.
2. are bound by a single membrane only in eukaryotes.
3. are composed of RNA and proteins.
4. are sites of protein synthesis in eukaryotes but not in prokaryotes.
Subtopic: Ribosome and Inclusion Bodies |
87%
From NCERT
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