KPK 11th Class Biology Chapter 6 Prokaryotes Short Questions Answers
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Class/Subject: 11th Class Biology
Chapter Name: Prokaryotes
Board: All KPK Boards
- Malakand Board 11th Class Biology Chapter 6 Prokaryotes short questions Answer
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KPK 11th Class Biology Chapter 6 Prokaryotes Short Questions Answers
What are archaea?
The Archaea make a kingdom or domain of single called microorganisms. Archaea are ting usually less than one micron long.
Why has monera become obsolete?
Membrane bounded organelles are absent in prokaryotes.
These are microscopic.
What is domain? Why is this term coined?
The three Domain system developed by Dr Carl woese in 1970 is a system for classifying biological organisms.
This classification was mainly based on differences in or RNA.
According to this classification all organisms are divided into 3 Domains.
Arxhaea Domain
Bacteria Domain
Eukarya Domain
What is the role of prokaryotes is supporting life on earth?
The organisms in which the nucleus is not bounded by a well defined nuclear membrane is called prokaryotes.
What are main defference b/w archaea and bacteria?
1. There is a different kind of lipids in the plasma membrane.
2. The cell wall of bacteria is composed of murein while the cell wall of Archaea lake murein.
3. The rRNA of Archaea is different from that of Bacteria.
Name Major groups of bacteria?
Proteobacteria
Alpha – Proteobacteria
Beta – Proteobacteria
Gamma – Proteobacteria
Dwlta Proteobacteria
Epsilon – Proteobacteria
What is the role of Cyanabacteria in the erolution of life?
Also called Blue green algae.
They are prokartotes and resembles bacteria so called cyanobacleria.
Cyanabacteria are Involved in N2 – fixation e.g. Nostoc.
They contain chlorophyll thus prepare food by the process of photosynthesis and releasing O2 thus the level of O2 was raised from 1 % to 21% .
With the Increase of O2 the amount of ozone also. Increased in the upper layers of the atmosphere.
What are plasmids and what is their importance?
It is an extra Chromosomal DNA ring of small size.
It replicate itself.
They contain genes which are resistant to diseases and Drugs.
It is also used as vector in Genetic engineering.
What is the function of Endospores?
The Gram positive bacteria produce highly resistant structurs called Endospores.
How do the chemoautotrophic bacteria work?
These bacteria do not use sunlight as a Bacteria get their energy from H2O, Ammonia, Nitrates, Nitratesand Iron compounds, this process is called chemoautotrophic.
What is genetic recombination?
Sexual Reproduction or Genetic recombination.
There is no sexual reproduction in Bacteria in true form, but a combination of two genetic materials takes place by certain methods it is known as genetic recombination.
What are Saprobes?
These Bacteria obtain their food from dead organic Substances and commonly called saprobes.
Define symbiosis?
Some bacteria forms an association with other organisms and are called symbiotic bacteria.
Are Bacteria Immortal?
No Bacteria are not Immortal, they grow and then die.
Define transformation in bacteria?
In is a process in which DNA of one bacterium is transmitted into another bacteria or alive bacteria are kept with dead bacteria, the alive bacteria gain DNA of dead bacteria and thus changed.
In 1928 Fredrich Grifth an German microbiologist reported the process of transformation.
Why are the bacteria called Nutrient recyclers?
A bacteria decompose the organic compounds like proteins and carbohydratesinto simple compound like CO2. The is fixed by green ants in photosynthesis. Bacteria also decompose and dead remains of plants and animals thus clean the earth and are called scavengers (cleaner of the earth).
Dissuss the role of radiation in controlling bacterial growth?
Water is removed from the contaminated materials. In the absence of water bacteria cannot grow.
