Cell Structure and Function

111 solved questions 4 tests

Ask a question

Take chapter test ← Previous Next chapter →

Select the correct statements.A. Tetrad formation is seen during Leptotene.B. During Anaphase, the centromeres split and chromatids separate.C. Terminalization takes place during Pachytene.D. Nucleolus, Golgi complex and ER are reformed during Teloph… Answer: 3. B and D only Key idea: Check the stages of cell division. A is wrong: tetrads form in pachytene, after synapsis; leptotene is the... Cell cycle, mitosis, meiosis 1 answer
Given below are two statements:Statement I: A protein is imagined as a line, the left end represented by first amino acid (C-terminal) and the right end represented by last amino acid (N-terminal)Statement II: Adult human haemoglobin, consists of 4 s… Answer: 1. Statement I is false but Statement II is true. Key idea: Check the orientation of a protein and the structure of haemoglobin. Sta... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Given below are two statements:Statement I: In prokaryotes, the positively charged DNA is held with some negatively charged proteins in a region called nucleoid.Statement II: In eukaryotes, the negatively charged DNA is wrapped around the positively… Answer: 1. Statement I incorrect but Statement II is true. Key idea: DNA is negatively charged because of its phosphate groups. Statement I... Cell theory, prokaryotic and eukaryotic cells, plant vs animal cell 1 answer
Which of the following functions is carried out by cytoskeleton in a cell? Answer: 4. Motility Key idea: The cytoskeleton is a network of protein filaments that gives mechanical support, maintains cell shape and hel... Cytoskeleton, cilia, flagella, centrioles; nucleus 1 answer
Which of the following are NOT considered as the part of endomembrane system?A. MitochondriaB. Endoplasmic ReticulumC. ChloroplastsD. Golgi complexE. PeroxisomesChoose the most appropriate answer from the options given below: Answer: 3. A, C and E only Key idea: The endomembrane system includes organelles whose functions are coordinated: ER, Golgi complex, lysosom... Endomembrane system: ER, Golgi, lysosomes, vacuoles 1 answer
Melonate inhibits the growth of pathogenic bacteria by inhibiting the activity of Answer: 2. Succinic dehydrogenase Key idea: Malonate (written "melonate" in the question) is a competitive inhibitor of succinic dehydrogena... Enzymes: types, properties, action, classification 1 answer
Given below are two statements:Statement I: Low temperature preserves the enzyme in a temporarily inactive state whereas high temperature destroys enzymatic activity because proteins are denatured by heat.Statement II: When the inhibitor closely rese… Answer: 2. Both Statement I and Statement II are true. Key idea: Both statements are standard facts about enzymes. Statement I is true: low... Enzymes: types, properties, action, classification 1 answer
How many different proteins does the ribosome consist of? Answer: 2. 80 Key idea: A ribosome is made of rRNA and about 80 different proteins. This is the figure used in NCERT, so the answer is 80. O... Mitochondria, ribosomes, plastids, microbodies 1 answer
The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis? Answer: 3. Pachytene Key idea: Recombination nodules appear during pachytene, when crossing over takes place between non-sister chromatids o... Cell cycle, mitosis, meiosis 1 answer
Among eukaryotes, replication of DNA takes place in - Answer: 3. S phase Key idea: DNA replication in eukaryotes takes place in the S (synthesis) phase of interphase. G1 is for cell growth, G2 f... Cell cycle, mitosis, meiosis 1 answer
Match List I with List II :List I | List IIA. M Phase | I. Proteins are synthesizedB. G_2 Phase | II. Inactive phaseC. Quiescent stage | III. Interval between mitosis and initiation of DNA replicationD. G_1 Phase | IV. Equational divisionChoose the c… Answer: 4. A-IV, B-I, C-II, D-III Key idea: Match each phase with its feature. M phase: equational division (IV). G2 phase: proteins are syn... Cell cycle, mitosis, meiosis 1 answer
Movement and accumulation of ions across a membrane against their concentration gradient can be explained by Answer: 1. Active Transport Key idea: Movement of ions against their concentration gradient needs energy (ATP) and carrier proteins, and thi... Cell envelope, cell membrane, cell wall 1 answer
Cellulose does not form blue colour with Iodine because Answer: 4. It does not contain complex helices and hence cannot hold iodine molecules. Key idea: The blue colour of the starch-iodine test c... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Match List - I with List - II.List - I (Biological Molecules): (a) Glycogen (b) Globulin (c) Steroids (d) ThrombinList - II (Biological functions): (i) Hormone (ii) Biocatalyst (iii) Antibody (iv) Storage productChoose the correct answer from the opt… Answer: 1. (a) - (iv), (b) - (iii), (c) - (i), (d) - (ii) Key idea: Match molecule and function. (a) Glycogen: storage product, (iv). (b) Gl... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
A dehydration reaction links two glucose molecules to produce maltose. If the formula for glucose is C_6H_12O_6 then what is the formula for maltose ? Answer: 4. C₁₂H₂₂O₁₁ Key idea: A dehydration reaction removes one water molecule when two units join. 2 glucose = mathrmC₁₂H₂₄O₁₂ . Subtract... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Select the incorrect statement with reference to mitosis : Answer: 3. Spindle fibres attach to centromere of chromosomes. Key idea: Spindle fibres attach to the kinetochores, which are protein discs... Cell cycle, mitosis, meiosis 1 answer
Read the following statements on lipids and find out correct set of statements :(a) Lecithin found in the plasma membrane is a glycolipid(b) Saturated fatty acids possess one or more c=c bonds(c) Gingely oil has lower melting point, hence remains as… Answer: 4. (c), (d) and (e) only (a) Lecithin is a phospholipid, not a glycolipid: false. (b) Saturated fatty acids have no double bonds: fa... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Regarding Meiosis, which of the statements is incorrect ? Answer: 3. DNA replication occurs in S phase of Meiosis-II Key idea: DNA replicates only once in meiosis, in the S phase before meiosis I. M... Cell cycle, mitosis, meiosis 1 answer
Addition of more solutes in a given solution will : Answer: 3. lower its water potential Water potential of pure water is highest (zero). Adding solute lowers the free energy of water, so solu... Cell envelope, cell membrane, cell wall 1 answer
Match List - I with List - II.List - I: (a) Metacentric chromosome (b) Acrocentric chromosome (c) Sub-metacentric chromosome (d) Telocentric chromosomeList - II: (i) Centromere situated close to the end forming one extremely short and one very long a… Answer: 2. (a) - (iii), (b) - (i), (c) - (iv), (d) - (ii) Metacentric: centromere in the middle, two equal arms, (iii). Acrocentric: centrom... Cytoskeleton, cilia, flagella, centrioles; nucleus 1 answer
Which of the following statements with respect to Endoplasmic Reticulum is incorrect ? Answer: 4. In prokaryotes only RER are present Key idea: Prokaryotes have no endoplasmic reticulum at all, because they lack membrane-bound... Endomembrane system: ER, Golgi, lysosomes, vacuoles 1 answer
Exoskeleton of arthropods is composed of : Answer: 4. Chitin The arthropod exoskeleton is made of chitin, a polymer of N-acetylglucosamine. Glucosamine is only its monomer unit, cutin... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Read the following statements and choose the set of correct statements :(a) Euchromatin is loosely packed chromatin(b) Heterochromatin is transcriptionally active(c) Histone octomer is wrapped by negatively charged DNA in nucleosome(d) Histones are r… Answer: 3. (a), (c), (d) Only (a) Euchromatin is loosely packed and transcriptionally active: true. (b) Heterochromatin is densely packed an... Cytoskeleton, cilia, flagella, centrioles; nucleus 1 answer
Which one of the following never occurs during mitotic cell division ? Answer: 4. Pairing of homologous chromosomes Pairing of homologous chromosomes (synapsis) is a feature of meiosis I, never of mitosis. In mi... Cell cycle, mitosis, meiosis 1 answer

← Previous

Page 2 of 5