Cell: The Unit of Life Questions
Consider the following statements: 1. RER is associated with protein synthesis and secretion. 2. SER is a major site for lipid synthesis. 3. Golgi apparatus modifies and packages materials. 4. Lysosomes contain hydrolytic enzymes. Which of the follow
Match the following:
Consider the following statements: 1. Both mitochondria and chloroplasts contain circular DNA. 2. Both contain 70S ribosomes. 3. Both are double membrane-bound. 4. Both are components of the endomembrane system. Which are correct?
Which statement is correct?
Assertion (A): Cytoskeleton helps maintain the shape of the cell. Reason (R): Cytoskeleton consists of microtubules, microfilaments and intermediate filaments forming an elaborate proteinaceous network.
Consider the following statements: 1. Eukaryotic cells possess a membrane-bound nucleus. 2. Prokaryotic cells lack a membrane-bound nucleus. 3. Both prokaryotic and eukaryotic cells contain ribosomes. 4. Only eukaryotic cells contain cytoplasm. Which
Assertion (A): Several ribosomes may attach to a single mRNA molecule. Reason (R): A chain of ribosomes attached to a single mRNA is called a polyribosome or polysome.
Consider the following statements: 1. Normally there is one nucleus per cell. 2. Some cells may contain more than one nucleus. 3. Mature erythrocytes of many mammals lack a nucleus. 4. Sieve tube cells of vascular plants retain a nucleus at maturity.
Which statement is correct?
Which of the following is incorrect?
Which statement is incorrect?
Consider the following statements: 1. Chloroplasts are double membrane-bound. 2. The inner chloroplast membrane is relatively less permeable. 3. The space enclosed by the inner membrane is called stroma. 4. Stroma contains enzymes required for carboh
Assertion (A): Mitochondria are called the powerhouses of the cell. Reason (R): Mitochondria produce cellular energy in the form of ATP.
Which statement is correct?
Consider the following statements: 1. Plant vacuoles contain cell sap and other materials. 2. Tonoplast facilitates transport of ions and other materials into the vacuole. 3. Contractile vacuole in Amoeba helps in osmoregulation. 4. Food vacuoles occ
Match the following:
Which statement is correct?
Assertion (A): Chromatin becomes organised into structured chromosomes during cell division. Reason (R): During interphase, chromatin exists as a loose and indistinct network of nucleoprotein fibres.
Consider the following statements: 1. Cilia are comparatively short structures. 2. Flagella are comparatively longer. 3. Cilia can move surrounding fluid. 4. Bacterial flagella have the same structure as eukaryotic flagella. Which are correct?
Which statement is incorrect?
Consider the following statements: 1. Golgi apparatus modifies proteins received from ER. 2. It packages materials into vesicles. 3. It is an important site for formation of glycoproteins and glycolipids. 4. It synthesises DNA. Which are correct?
Assertion (A): The bacterial plasma membrane is selectively permeable. Reason (R): The bacterial plasma membrane interacts with the outside world.
Match the following:
Consider the following statements: 1. Mitochondrial matrix contains circular DNA. 2. Mitochondria contain 70S ribosomes. 3. Mitochondria possess a few RNA molecules. 4. Mitochondria divide by fission. Which are correct?
Which statement is incorrect?
Assertion (A): Mitochondria are not considered part of the endomembrane system. Reason (R): Their functions are not coordinated with ER, Golgi apparatus, lysosomes and vacuoles.
Which statement is correct?
Consider the following statements: 1. Cytoskeleton contains microtubules. 2. Cytoskeleton contains microfilaments. 3. Cytoskeleton contains intermediate filaments. 4. Cytoskeleton is a membrane-bound organelle. Which are correct?
Which statement is correct?
Consider the following statements: 1. Thylakoids are arranged into grana. 2. Stroma lamellae connect thylakoids of different grana. 3. Chlorophyll is present in thylakoids. 4. Stroma contains enzymes required for synthesis of carbohydrates and protei
Which statement is incorrect?
Consider the following statements: 1. Each centriole has nine peripheral fibrils. 2. Each peripheral fibril is a triplet. 3. The proximal region contains a proteinaceous hub. 4. Adjacent triplets are linked. Which statements are correct?
Which statement is correct?
Consider the following statements: 1. Bacterial flagellum has filament, hook and basal body. 2. Filament is the longest part. 3. Pili and fimbriae are primarily responsible for bacterial motility. 4. Fimbriae may help bacteria attach to host tissues.
Which statement is incorrect?
Assertion (A): A typical eukaryotic cilium shows a 9+2 arrangement of microtubules. Reason (R): Its axoneme contains nine peripheral microtubule doublets and a central pair of microtubules.
Match the following:
Which of the following is correct?
Consider the following statements: 1. Nucleolus is a spherical structure in the nucleoplasm. 2. It is surrounded by a membrane. 3. It is a site of active rRNA synthesis. 4. Larger and more numerous nucleoli occur in cells actively carrying out protei
Which of the following statements is correct?
Consider the following statements: 1. Mitochondria are double membrane-bound organelles. 2. Cristae are infoldings of the inner mitochondrial membrane. 3. The matrix lies between the outer and inner membranes. 4. Cristae increase the surface area of
Assertion (A): All cells arise from pre-existing cells. Reason (R): Rudolf Virchow explained that cells divide and new cells are formed from pre-existing cells.
Which of the following statements is incorrect?
Consider the following statements: 1. RER bears ribosomes on its outer surface. 2. SER is a major site for lipid synthesis. 3. RER is frequently observed in cells actively involved in protein synthesis and secretion. 4. SER is continuous with the out
Which of the following statements is correct?
Which one is the wrong statement regarding cell organelles ?
'Phosphoglycerides' is a main component of ?
Read the following statements with respect to given diagram and select the correct option. (A) The inner compartment of the organelle is filled with a dense heterogeneous substance called the matrix. (B) The number of this organelle per cell is varia
Which of the following is true of nucleolus?
Which of the following is a function of the mesosome in a prokaryotic cell?