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Biology · CELL THE UNIT OF LIFE
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Biology · CELL THE UNIT OF LIFE
What is the typical diameter of human red blood cells?
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Match List-I with List-II: List-I (Plastid Type) List-II (Storage / Pigment Content) A Amyloplasts I Fat soluble carotenoid pigments like carotene and xanthophylls B Elaioplasts II Proteins storage C Aleuroplasts III Oils and fats storage D Chromoplasts IV Carbohydrates (starch) storage Choose the correct answer from the options given below:
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Chemical studies on human erythrocyte membranes revealed that the membrane consists of lipids and proteins. What is the approximate proportion of protein and lipid, respectively?
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A eukaryotic cilium axoneme has a \( 9+2 \) arrangement of microtubules, whereas a centriole shows a \( 9+0 \) cartwheel arrangement. How many individual protofilament-forming microtubules constitute the peripheral fibrils in a single cilium axoneme and a single centriole barrel, respectively?
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Bacterial flagella consist of three distinct parts: filament, hook, and basal body. Which part is the longest and extends from the cell surface to the outside?
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Match List-I with List-II: List-I (Prokaryotic Structure) List-II (Characteristic / Content) A Polysome I Several ribosomes attached to a single mRNA B Chromatophores II Membranous extensions containing pigments in cyanobacteria C Inclusion bodies III Non-membrane bound stores like glycogen and phosphate granules D Gas vacuoles IV Buoyancy structures in purple and green photosynthetic bacteria Choose the correct answer from the options given below:
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Given below are four statements regarding the Golgi apparatus: (A) Vesicles containing materials from the ER fuse exclusively with the concave trans face. (B) Proteins synthesised by ribosomes on the ER are modified in the cisternae of the Golgi apparatus before being released from its trans face. (C) Golgi apparatus is the important site of formation of glycoproteins and glycolipids. (D) The cis and trans faces of the Golgi apparatus are structurally and functionally identical. Choose the correct answer from the options given below:
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What is the typical width of the perinuclear space between the outer and inner nuclear membranes, and what is the primary role of nuclear pores traversing this envelope?
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Which of the following parts of the bacterial flagellum represents its longest portion and extends from the cell surface to the outside?
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Given below are two statements: Statement I: The quasi-fluid nature of membrane lipids enables the lateral movement of proteins within the overall lipid bilayer. Statement II: The ability of proteins to move within the membrane bilayer is measured as membrane fluidity. 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 (Biological entity) List-II (Dimension/Size) A Mycoplasma I About 7.0 µm in diameter B Bacteria II 0.3 µm in length C Human RBCs III 3 to 5 µm in length D Typical eukaryotic cell IV 10 to 20 µm Choose the correct answer from the options given below:
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Arrange the following biological entities in strict ascending order of their sizes: (I) Viruses (II) PPLO (III) Typical bacteria (IV) Typical eukaryotic cell
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In the sectional view of the chloroplast shown below (Figure 8.8), identify the structure and arrangement represented by 'Granum' and 'Stroma lamella':
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Match List-I with List-II: List-I (Bacterial Structure) List-II (Feature / Function) A Mesosome I Elongated tubular structures made of special protein B Pili II Small bristle-like fibres helping in attachment to rocks C Fimbriae III Filament, hook and basal body involved in motility D Flagellum IV Infoldings helping in respiration and cell wall formation Choose the correct answer from the options given below:
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Which of the following physiological statements regarding plant vacuoles and tonoplast transport is correct?
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Match the bacterial morphology correctly: comma-shaped bacteria are designated as:
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A chromosome possesses a centromere situated close to its end, resulting in one extremely short arm and one very long arm. Based on centromere position, this chromosome is classified as:
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In ribosomes, 'S' denotes the Svedberg unit which indirectly measures which two physical parameters of the ribonucleoprotein complex?
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Given below are two statements:\n Statement I: The content of the nucleolus is separated from the surrounding nucleoplasm by a continuous single unit membrane.\n Statement II: Nucleoli are smaller and fewer in cells that are actively carrying out high levels of protein synthesis. \nIn 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: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Inclusion bodies in prokaryotes lie freely in the cytoplasm without any enclosing membrane system. Reason (R): Reserve materials in prokaryotic cells are stored in the cytoplasm in the form of inclusion bodies. In the light of the above statements, choose the correct answer from the options given below:
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Match List-I with List-II: List-I (Chromosome Type) List-II (Centromere Position and Arm Morphology) A Metacentric I Middle centromere forming two equal arms B Sub-metacentric II Centromere slightly away from middle, one shorter and one longer arm C Acrocentric III Centromere situated close to end, one extremely short and one very long arm D Telocentric IV Centromere located strictly at the terminal end Choose the correct answer from the options given below:
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The two subunits that assemble together to form the 70S prokaryotic ribosome are:
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