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Biology · CELL THE UNIT OF LIFE
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Biology · CELL THE UNIT OF LIFE
Algae have a cell wall composed of specific chemical constituents that differentiate them from higher terrestrial plants. Which of the following correctly represents the chemical components present in the algal cell wall?
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Which of the following cell types is correctly matched with its specific shape?
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What is the primary function of fimbriae in bacterial cells?
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Given below are two statements: Statement I: Lysosomal vesicles are characterized by having an internal basic pH optimum for their hydrolytic enzymes. Statement II: The isolated hydrolytic enzymes of lysosomes (hydrolases) are capable of digesting carbohydrates, proteins, lipids, and nucleic acids. In the light of the above statements, choose the most appropriate answer from the options given below:
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Match List-I with List-II: List-I (Cellular Feature) List-II (Distribution / Occurrence) A Centrioles I Present in plant cells, absent in animal cells B Plastids II Present in animal cells, absent in almost all plant cells C Large central vacuole III Unique rigid delimitation of plant cells D Cell wall IV Occupies major central volume in mature plant cells Choose the correct answer from the options given below:
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According to the fluid mosaic model of Singer and Nicolson, which of the following physiological principles correctly explains why polar molecules require carrier proteins to cross the plasma membrane?
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Match List-I with List-II: List-I List-II A Matthias Schleiden I Proposed that all plants consist of different kinds of cells forming tissues B Theodore Schwann II Presence of cell wall is a unique character of plant cells C Rudolf Virchow III Omnis cellula-e cellula D Antonie Von Leeuwenhoek IV First saw and described a live cell Choose the correct answer from the options given below:
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Which of the following statements about the bacterial cell envelope is correct?
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Consider the following statements regarding the cell membrane: (A) The membrane is mainly composed of lipids and proteins arranged in a bilayer. (B) Membrane proteins can be classified as integral or peripheral based on the ease of extraction. (C) The ratio of protein and lipid is rigidly fixed at 50:50 across all cell types. (D) Peripheral proteins are completely buried deep within the hydrophobic core of the bilayer. Which of the above statements are correct?
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Given below are two statements: Statement I: Gas vacuoles are found in blue green and purple and green photosynthetic bacteria. Statement II: Gas vacuoles are bound by a typical lipid bilayer membrane identical to the plasma membrane. In the light of the above statements, choose the most appropriate answer from the options given below:
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What is the unique functional significance of plasmid DNA found outside the genomic DNA in many bacterial cells?
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In the axoneme of eukaryotic cilia and flagella having a \( 9+2 \) arrangement, how many total radial spokes and central microtubules are present in a cross-section?
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In the diagram of the plant cell shown below (Figure 8.3a), which of the following structures connects the cytoplasm of neighbouring plant cells through their cell walls?
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Examine the diagram showing comparison of eukaryotic cell with other organisms: Which organism shown in the diagram lacks a cell wall and has a size of about 0.1 µm?
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Given below are two statements: Statement I: Prokaryotes generally multiply much more slowly than eukaryotic cells. Statement II: Mycoplasmas possess a thick peptidoglycan cell wall surrounding their plasma membrane. In the light of the above statements, choose the most appropriate answer from the options given below:
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Given below are two statements: Statement I: The onion cell has a distinct cell wall as its outer boundary and just within it is the cell membrane. Statement II: The cells of the human cheek have a rigid outer cell wall as the delimiting structure of the cell. In the light of the above statements, choose the most appropriate answer from the options given below:
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Match List-I with List-II: List-I (Membrane Component) List-II (Feature / Percentage in RBC) A Protein in human erythrocyte I Approximately 40 per cent B Lipid in human erythrocyte II Approximately 52 per cent C Nonpolar saturated tails III Point towards outer aqueous sides D Polar phosphate heads IV Protected towards the inner part of bilayer Choose the correct answer from the options given below:
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Consider the following statements about chromatin and chromosomes in human cells: (A) A single human cell contains approximately two metres of DNA distributed among its 46 chromosomes. (B) Chromatin contains DNA, basic proteins called histones, non-histone proteins, and RNA. (C) Secondary constrictions are non-staining regions found on all 46 chromosomes at constant locations. (D) Chromosomes with a terminal centromere are designated as telocentric chromosomes. Which of the above statements are correct?
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Ribosomes were discovered by George Palade in 1953 as dense ribonucleoprotein particles. In eukaryotic 80S and prokaryotic 70S ribosomes, what does the unit 'S' (Svedberg unit) fundamentally quantify?
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Match List-I with List-II: List-I (Organelle) List-II (Characteristic Function / Feature) A Golgi apparatus I Synthesis of steroidal hormones in animal cells B Lysosomes II Site of formation of glycoproteins and glycolipids C Smooth ER III Single membrane tonoplast facilitates uphill ion transport D Plant vacuole IV Hydrolases optimally active at acidic pH Choose the correct answer from the options given below:
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Rudolf Virchow gave the final shape to the cell theory in 1855 by modifying the original hypothesis. What crucial concept did he contribute?
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In many bacterial cells, small circular DNA molecules termed plasmids confer which of the following unique phenotypic characters?
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