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(a.) II → I → IV → III (b.) IV → I → II → III (c.) III → II → I → IV (

(a.) II I IV III (b.) IV I II III (c.) III II I IV (d.) (35.) In eukaryotes, basic structural unit made up of histone and DNA is (a.) Nucleosome (b.) Nucleolus (c.) Chromosome (d.) Lysosome (36.) Choose the correct statement from the codes given below

  1. Separation from extracellular medium allows the cells to maintain its chemical pool, orderliness of structure and reactions in contrast to disorderly distribution and randomly interacting molecules in the extra-cellular medium
  2. Cells are unable to recognise one another due to the present of specific chemicals on their surface
  3. Cells of plant tissues are often connected with one another through cytoplasmic bridges called plasmodesmata
  4. Different cells of an organism communicate as well as exchange materials with one another
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are transported away from thermodynamic equilibrium; hence. energy is required. This energy can come from the hydrolysis of ATP, from electron movement or from light. The main tenance of electrochemical gradients in biochemical systems is very important. It consumes perhaps of the total energy expenditure in a cell. Two main types of active transport are: - Primary Active Transport - Secondary Active Transport Primary active transport: Cells transport molecules against their concentration gradients. In primary active transport, energy is provided by another coupled reaction such as the hydrolysis of ATP. This energy is used to drive the uphill transport of molecules in energetically unfavourable direction. Sodium-potassium exchange pump is an example of primary active transport. For each molecule of ATP used, three ions are pumped out and two ions are pumped in. A specific protein works as a carrier molecule. Secondary active transport: A secondary active transport takes place with the help of ion gradients from the coupled transport of a second molecule. The gradient established by the pump provides a source of energy that is frequently used to power the active transport of sugars. amino acids and ions in mammalian cells. The gradients established by the pumps of bacteria, yeast, and plant cells play similar roles. (c) Bulk Transport Bulk transport occurs by two main methods endocytosis and exocytosis. They involve the enclosure of the material under transport in carrier vesicles of the membrane. The ther tof lownder exocytossort in carrier vesicles of linward transport of carrier vesicles is called endocytosis intward transport of carrier vesicles is called exocytosis. The outward trans cells. than bulk transport is common in exulf extracellular substances and vesicles. Endocytosis: Cells engulf extracellular itated ision. bring them to the cytoplasm in membrane-bund vesic
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Question Text
(a.) II I IV III (b.) IV I II III (c.) III II I IV (d.) (35.) In eukaryotes, basic structural unit made up of histone and DNA is (a.) Nucleosome (b.) Nucleolus (c.) Chromosome (d.) Lysosome (36.) Choose the correct statement from the codes given below
Updated OnSep 10, 2022
TopicCell: Structure and Functions
SubjectBiology
ClassClass 11
Answer Type Video solution: 1
Upvotes78
Avg. Video Duration20 min