Question

9. What are diploi
1. Describe structure of a chromosome
Describe structure and functions of plasma
membrane
What do you mean by passive and active
transport ? Write a note on diffusion.
Describe the mechanism of osmosis. Give its
importance​

Answer 1

Explanation:

1)In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.

2)Structure of Plasma Membranes

The primary function of the plasma membrane is to protect the cell from its surroundings. Composed of a phospholipid bilayer with embedded proteins, the plasma membrane is selectively permeable to ions and organic molecules and regulates the movement of substances in and out of cells.

3)Active transport is the movement of molecules or ions against a concentration gradient (from an area of lower to higher concentration), which does not ordinarily occur, so enzymes and energy are required. Passive transport is the movement of molecules or ions from an area of higher to lower concentration.

4)Diffusion is a physical process that refers to the net movement of molecules from a region of high concentration to one of lower concentration. The material that diffuses could be a solid, liquid or gas.

5)✔The movement of water molecules from a region of high concentration to a region of low concentration through a selectively permeable membrane is called osmosis. ... ✔Osmosis also influences the distribution of nutrients and the release of metabolic waste products into and out of the body.

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Answer 2

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