10 Questions
What type of nucleus do organisms in Kingdom Monera possess?
Prokaryotic nucleus
Which of the following statements is true about the cell wall of Monera?
The cell wall is made of peptidoglycan.
What is the typical size range of cells in Kingdom Monera?
0.2-10.0 μm³
What substance is absent in the cell wall of archaebacteria?
Peptidoglycan
Which structural component is absent in cells of Kingdom Monera?
Nuclear envelope
How is the genetic material of Kingdom Monera organized?
Circular and naked DNA
What is the characteristic of cytoplasm in Monera?
Contains nucleoid and gas vesicles
Which structure is considered absent in Monera?
Endoplasmic Reticulum
Where can Monera organisms typically thrive?
In all environments including extreme conditions
What is the term used to describe the DNA nature in cells of Kingdom Monera?
Naked DNA
Study Notes
Kingdom Monera
- Derived from the Greek word "monos", meaning single or solitary.
Definition
- Consists of ancient, single-celled prokaryotic organisms with no true nucleus.
- Cells may be solitary or form filaments or colonies.
Distribution
- Found in all types of environments on Earth.
- Some species can thrive in extreme environments, such as high temperatures, high salinity, alkalinity, or acidity.
General Characteristics
- Cell Nature: Simple, prokaryotic, sometimes forming filaments or colonies.
- Cell Size and Volume: Extremely small, microscopic, with a volume of 0.2-10.0 μm³, and a length of 0.1-5.0 μm.
- Cell Wall: Present, composed of peptidoglycan and polysaccharides, except in Archaeobacteria, where it is protein-based, and in Mycoplasma, where it is absent.
- Cytoplasm: Colorless, jelly-like, with no nuclear membrane-bound organelles or gas vacuoles, but with a nuclear body and primitive cytoskeleton.
- Nuclear Body: No true nucleus, but a nucleoid, which is a region with no nuclear membrane.
- Genetic Material:
- A single, circular, naked DNA molecule (no histone proteins) in the cytoplasm, which serves as the genetic material.
Learn about the ancient, single-celled prokaryotic organisms of Kingdom Monera, their distribution, and general characteristics. Test your knowledge of these microorganisms that thrive in various environments.
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