Question

hort Answer Questions (Carrying 2 marks ealli)
1. Distinguish between prokaryotic and enkaryotic
cells.
2. Write down differences between organ and
organelle
3. Write down differences between nucleus and
nucleoid.
4. Mention differences between light microscope
and electron microscope.
5. Give a brief account of discovery of the cell.
6. Describe the proteins of plasma membrane
7. Enumerate functions of plasma membrane
8. Give an example of diffusion across plasma
membrane.​

Answer 1

Explanation:

if u r asking long questions , pls increase the points for those .

Answer 2

Answer:

1) ans: refer the photo

2) ➡A group of tissues which have common origin and perform similar function make up an organ. Organ is the collection of tissues performing similar function.

➡Organelle is a small structure which lies inside the cell and performs certain functions of the cell. Organelles are microscopic and lie inside the cell.

3) refer the 2nd photo

4)Light Microscope uses visible light, and Electron Microscope uses electrons (beam of charged particles) to view the object. ... In Light Microscope projection screen and glass lenses are used but in Electron Microscope fluorescent screen and an Electromagnetic screen is used.

5) The cell was first discovered by Robert Hooke in 1665, which can be found to be described in his book Micrographia. In this book, he gave 60 'observations' in detail of various objects under a coarse, compound microscope. ... Hooke discovered a multitude of tiny pores that he named "cells".

6) Plasma membrane is made up of lipids.

Membrane proteins perform a variety of functions vital to the survival of organisms: Membrane receptor proteins relay signals between the cell's internal and external environments. Transport proteins move molecules and ions across the membrane. ... Cell adhesion molecules allow cells to identify each other and interact.

7)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.

8) In the cell, examples of molecules that can use simple diffusion to travel in and out of the cell membrane are water, oxygen, carbon dioxide, ethanol and urea. They pass directly through the cell membrane without energy along the concentration gradient.

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