S.N DNA RNA 1. It stands for deoxyribonucleic acid. It stands for ribonucleic acid. 2. It is double stranded except in some viruses. It is single stranded exception some viruses. 3. It is self-replicating. It is synthesized from DNA or on as needed basis. 4. The sugar portion of DNA is 2-deoxyribose. The sugar portion … Read more
Media exists in three different forms. They are: Solid culture media. Semisolid culture media. Fluid culture media. Solid culture media: Mainly used in petri dishes as plate cultures. Can also be used in bottles or tubes as stab (deep) or slope cultures. Usually contain a concentration of 1-2% agar to yield a suitable gel. Used … Read more
S.N Exotoxin Endotoxin 1. It is released outside the cell. It is present inside the cell membrane and released only when the cell lyse. 2. It is proteinous in nature. It is lipoproteinous in nature. 3 It is heat labile generally. It is heat stable generally. 4 It is mostly secreted by gram positive … Read more
S.N Antigens Antibodies 1. Commonly called “antibodies generating chemicals” or immunogens. Commonly called immunoglobulins. 2. Both proteinous or polysachharides. Always proteinous in nature. 3. They are present on the cell membrane. They are present in the plasma. 4. These stimulate the immunity of the body. These protect the body from infections. 5. May be a … Read more
Chlorophyceae Phaeophyceae Rhodophyceae Commonly known as green algae. Commonly known as brown algae. Commonly known as red algae. Mostly found in aquatic habitats. Mostly marine. Mostly found in warm marine water. A few are terrestrial or marine. Only a few are found in fresh water. A few are found … Read more
S.N Gram positive bacteria Gram negative bacteria 1 They retain the crystal violet stain during gram staining. They do not retain the crystal violet stain during gram staining. 2 Cell wall is simple. Cell wall is complex. 3 They appear blue/purple. They appear pink/red. 4 The thickness of wall is 20-80 nm. Thickness of wall … Read more
Bacteria 1. very small in size. Virus 1. smaller than bacteria 2. can be seen under compound microscope. 2. can be seen only under an electron microscope. 3. shows metabolic activities. 3. do not show metabolic activities. 4. … Read more