Cell Structure and Function

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The appearance of recombination nodules on homologous chromosomes during meiosis characterizes : Answer: 4. Sites at which crossing over occurs Recombination nodules are protein-rich structures seen in the pachytene stage on the synapton... Cell cycle, mitosis, meiosis 1 answer
Following are the statements with reference to ‘lipids’.(a) Lipids having only single bonds are called unsaturated fatty acids.(b) Lecithin is a phospholipid.(c) Trihydroxy propane is glycerol.(d) Palmitic acid has 20 carbon atoms including carboxyl… Answer: 3. (b) and (c) only (a) False: lipids with only single bonds are saturated. (b) True: lecithin is a phospholipid. (c) True: glycerol... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Identify the incorrect pair. Answer: 4. Drugs - Ricin Codeine is an alkaloid - correct. Abrin is a toxin - correct. Concanavalin A is a lectin - correct. Ricin is a toxi... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
The fruit fly has 8 chromosomes (2n) in each cell. During interphase of Mitosis if the number of chromosomes at G_1 phase is 8, what would be the number of chromosomes after S phase ? Answer: 1. 8 The chromosome number does not change in S phase; only DNA content doubles, because each chromosome gets two sister chromatids... Cell cycle, mitosis, meiosis 1 answer
Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature ? Answer: 3. Diakinesis Terminalisation of chiasmata (chiasmata slide towards the ends of the bivalents) occurs in diakinesis, the last stage... Cell cycle, mitosis, meiosis 1 answer
The centriole undergoes duplication during : Answer: 1. S-phase Centrioles duplicate during the S phase of the cell cycle (in the cytoplasm, alongside DNA replication), so that two cent... Cell cycle, mitosis, meiosis 1 answer
Match List - I with List - II.List - I | List - II(a) Protein | (i) C=C double bonds(b) Unsaturated fatty acid | (ii) Phosphodiester bonds(c) Nucleic acid | (iii) Glycosidic bonds(d) Polysaccharide | (iv) Peptide bondsChoose the correct answer from t… Answer: 1. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) Match each biomolecule with its bond: Protein: peptide bonds, (a)-(iv). Unsaturated fatty... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Match List - I with List - II.List - I | List - II(a) S phase | (i) Proteins are synthesized(b) G2 phase | (ii) Inactive phase(c) Quiescent stage | (iii) Interval between mitosis and initiation of DNA replication(d) G1 phase | (iv) DNA replicationCho… Answer: 3. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) Match each phase: S phase: DNA replication, (a)-(iv). G2 phase: proteins are synthesised f... Cell cycle, mitosis, meiosis 1 answer
The organelles that are included in the endomembrane system are : Answer: 2. Endoplasmic reticulum, Golgi complex, Lysosomes and Vacuoles The endomembrane system includes organelles whose functions are coor... Endomembrane system: ER, Golgi, lysosomes, vacuoles 1 answer
Which of the following are not secondary metabolites in plants ? Answer: 2. Amino acids, glucose Secondary metabolites include alkaloids (morphine, codeine), terpenoids (vinblastin), pigments and drugs (cu... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Which of the following stages of meiosis involves division of centromere ? Answer: 3. Anaphase II In meiosis, sister chromatids separate only in anaphase II, when the centromere splits and each chromatid becomes a s... Cell cycle, mitosis, meiosis 1 answer
Which of the following is an incorrect statement ? Answer: 1. Mature sieve tube elements possess a conspicuous nucleus and usual cytoplasmic organelles. Find the incorrect statement. Statemen... Cytoskeleton, cilia, flagella, centrioles; nucleus 1 answer
When the centromere is situated in the middle of two equal arms of chromosomes, the chromosome is referred as : Answer: 1. Metacentric The position of the centromere decides chromosome type. A centromere in the middle, giving two equal arms, makes the... Cytoskeleton, cilia, flagella, centrioles; nucleus 1 answer
Match List - I with List - II.List - I | List - II(a) Cristae | (i) Primary constriction in chromosome(b) Thylakoids | (ii) Disc-shaped sacs in Golgi apparatus(c) Centromere | (iii) Infoldings in mitochondria(d) Cisternae | (iv) Flattened membranous… Answer: 3. (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii) Match each structure with its description: Cristae are infoldings of the inner mitochondri... Mitochondria, ribosomes, plastids, microbodies 1 answer
Identify the basic amino acid from the following. Answer: 3. Lysine Lysine has an extra amino group in its side chain, so it is a basic amino acid (like arginine and histidine). Glutamic aci... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Which one of the following is the most abundant protein in the animals ? Answer: 2. Collagen Collagen is the most abundant protein in animals (and RuBisCO is the most abundant protein in the whole biosphere). Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Dissolution of the synaptonemal complex occurs during : Answer: 3. Diplotene The synaptonemal complex forms in zygotene, is complete in pachytene and dissolves in diplotene, when homologues separa... Cell cycle, mitosis, meiosis 1 answer
Some dividing cells exit the cell cycle and enter vegetative inactive stage. This is called quiescent stage (G_0). This process occurs at the end of : Answer: 2. G ₁ phase Cells leave the cell cycle to enter the G0 (quiescent) stage at the end of G1 phase, before the S phase begins. They re... Cell cycle, mitosis, meiosis 1 answer
Match the following with respect to meiosis :(a) Zygotene (i) Terminalization(b) Pachytene (ii) Chiasmata(c) Diplotene (iii) Crossing over(d) Diakinesis (iv) SynapsisSelect the correct option from the following : Answer: 2. (a) (iv), (b) (iii), (c) (ii), (d) (i) Link each meiotic prophase I sub-stage to its main event. Zygotene: pairing of homologous... Cell cycle, mitosis, meiosis 1 answer
Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their : Answer: 3. Defence action Key idea: Secondary metabolites are not needed for basic growth but have ecological roles. Nicotine, strychnine an... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Match the following :(a) Inhibitor of catalytic activity (i) Ricin(b) Possess peptide bonds (ii) Malonate(c) Cell wall material in fungi (iii) Chitin(d) Secondary metabolite (iv) CollagenChoose the correct option from the following : Answer: 1. (a) (ii), (b) (iv), (c) (iii), (d) (i) Key idea: Match each item with its category. Inhibitor of catalytic activity: malonate (co... Enzymes: types, properties, action, classification 1 answer
Identify the substances having glycosidic bond and peptide bond, respectively in their structure : Answer: 4. Inulin, insulin Key idea: Glycosidic bonds link sugars in polysaccharides; peptide bonds link amino acids in proteins. Inulin is... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Identify the correct statement with regard to G_1 phase (Gap 1) of interphase. Answer: 3. Cell is metabolically active, grows but does not replicate its DNA. Key idea: G₁ is the growth phase before DNA replication. In G... Cell cycle, mitosis, meiosis 1 answer
Which of the following statements about inclusion bodies is incorrect ? Answer: 2. These are involved in ingestion of food particles. Key idea: Inclusion bodies are non-membrane-bound reserve materials lying free... Cell theory, prokaryotic and eukaryotic cells, plant vs animal cell 1 answer

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