- Diatoms are the chief producers in the oceans.
- In bacteria the ribosomes are present singly or in small groups called POLYRIBOSOMES.
- Cell wall of bacteria contain acetyl glucosamine, acetyl muramic acid, & a peptide chain of four or five amino acids. All these chemicals together form a polymer called PEPTIDOGLYCAN.
- Transduction was discovered by Zinder & Lederberg in 1952 in Salmonella typhimurium.
- Mycoplasmas are smallest free living organism discovered by E.Nocard & E.R.Roux from pleural fluids of cattle suffering from bovin pleuropneumonia & named them as pleuropneumonia like organisms or PPLO. They were named mycoplasmas by Nowak in 1929. Mycoplasmas can survive without oxygen.
MCQ ON BIOLOGICAL CLASSIFICATION 3 24JUNE2024
well done . Try again best of luck Mycoplasmas because they do not have a definite shape. Mycoplasmas Archaebacteria are the primitive prokaryotic cells found in harsh conditions also. They are of three types : Nucleic acid. Viroids are infectious particles having nuclear acid that is a free RNA. Viruses having protein coat enclosing nucleoid. Cyanobacteria : Heterocyst : Special cells in Cyanobacteria like Nostoc , Anabaena ,Scytonema to perform special functions . They are the site of nitrogen fixation they have thick cell wall and lack nucleoid. All of the above. Archaebacteria Lichens. Symbiotic relationship between fungus and algae form a structure called Lichens. Fungal partner is known as mycobiont and Algal partner as phycobiont. Peptidoglycan All of the above. These all are dinoflagellates.
Results
#1. “Jokers of the plant kingdom” are
#2. Cell wall is absent in
#3. Which of the following are found in extreme saline conditions
#4. Viroids have
#5. Heterocyst are present in
#6. Choose the correct option
#7. Oldest living fossils are
#8. Pollution indicator are
#9. Cell wall of bacteria is made up of
#10. Red tide is caused by