Question

2. Answer the following questions Mania A) Plants have no circulatory system? Then how cells manage intercellular tran
sport? B. Is nucleolus covered by membrane? C. Fluid mosaic model proposed by Singer and Nicolson replaced Sandwich model proposed by Danielli and Davson? Why?​

Answer 1

$\rm \purple \bigstar{Answers }$

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A) Plants have no circulatory system?Then how cells manage intercellular transport?

Answer:Plants have some special tissues that will help the plants in intercellular transport.Plants do not have circulatory system.

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B. Is nucleolus covered by membrane?

Answer: Nucleolus is present in Nucleus. And Nucleolus is not covered by a membrane.

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C. Fluid mosaic model proposed by Singer and Nicolson replaced Sandwich model proposed by Danielli and Davson? Why?

Answer:The sandwich model explains the structure of the cell membrane .It shows that the lipid layer is sandwiched between the protein layers. Fluid mosaic model shows only the characteristics of cell membrane. It was replaced because the sandwich model gives more information about the arrangement of lipids and proteins.

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