Mitochondria, ribosomes, plastids, microbodies
- From the statements given below choose the correct option :A. The eukaryotic ribosomes are 80S and prokaryotic ribosomes are 70S.B. Each ribosome has two sub-units.C. The two sub-units of 80S ribosome are 60S and 40S while that of 70S are 50S and 30S… Answer: 1. A, B, C are true Key idea: Eukaryotic ribosomes are 80S, made of 60S and 40S subunits. Prokaryotic ribosomes are 70S, made of 50S... 1
- Given below are two statements :Statement I : Mitochondria and chloroplasts are both double membrane bound organelles.Statement II : Inner membrane of mitochondria is relatively less permeable, as compared to chloroplast.In the light of the above sta… Answer: 4. Statement I is correct but Statement II is incorrect. Key idea: both organelles are bounded by two membranes, and in both the inn... 1
- The DNA present in chloroplast is: Answer: 3. Circular, double stranded Key idea: chloroplast DNA is like bacterial DNA. It is circular and double stranded, and lies in the st... 1
- Match List I with List IIList I: A. Nucleolus; B. Centriole; C. Leucoplasts; D. Golgi apparatusList II: I. Site of formation of glycolipid; II. Organization like the cartwheel; III. Site for active ribosomal RNA synthesis; IV. For storing nutrientsCh… Answer: 2. A-III, B-II, C-IV, D-I Key idea: match each organelle with its function or structure. Nucleolus: site of active rRNA synthesis (I... 1
- 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... 1
- 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... 1
- Which of the following statements regarding mitochondria is incorrect ? Answer: 2. Enzymes of electron transport are embedded in outer membrane. The enzymes of the electron transport chain are in the inner mitoch... 1
- Which of the following pair of organelles does not contain DNA ? Answer: 3. Lysosomes and Vacuoles Mitochondria and chloroplasts contain their own DNA, and the nucleus holds the cell's DNA. Lysosomes and v... 1
- Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP ? Answer: 3. Mitochondrion Key idea: ATP is made from the breakdown of food by cellular respiration. The mitochondrion oxidises pyruvate from... 1
- Mitochondria and chloroplast are :(a) semi-autonomous organelles.(b) formed by division of pre - existing organelles and they contain DNA but lack protein synthesizing machinery.Which one of the following options is correct ? Answer: 3. (a) is true but (b) is false. Key idea: Mitochondria and chloroplasts are semi-autonomous organelles. (a) True. They have their o... 1