PRE-LAB QUESTIONS 1. Some members of the Domain Bacteria -7. Gram stain is used
ID: 210582 • Letter: P
Question
PRE-LAB QUESTIONS 1. Some members of the Domain Bacteria -7. Gram stain is used to distinguish between have (a) a nucleus (b) membrane-bound organelles (c) chloroplasts (d) photosynthetic ability different (a) bacteria (b) protistans (c) dinoflagellates (d) all of the above Those organisms that are covered by numerous, tiny locomotory structures belong to the phylum (a) Euglenozoa (b) Stramenopila (c) Amoebozoa (d) Ciliata 8. A pathogen is (a) a disease (b) an organism that causes a disease (c) a substance that kills bacteria (d) the same as a heterocyst 2, _ 3. Which of the following is truel? (a) All bacteria are autotrophic (b) All protists are heterotrophic (c) Oscillatoria is photoautotrophic (d) Trypanosoma is photoautotrophic -9, /1 vector is (a) an organism that causes disease (b) a disease (c) a substance that prevents disease (d) an organism that transmits a disease 4. Which organisms are characterized as decomposers? (a) bacteria (b) protozoans (c) amoebas causing organism 10. The organism that causes malaria is (a) a pathogen (b) Plasmodium vivax (c carried by a mosquito (d) all of the above 5. Organisms capable of nitrogen fixation (a) include some bacteria (b) include some cyanobacteria (c) may live as symbionts with other which of these organisms (or parts of the organisms) might you find as an ingredient in toothpaste (a) euglenoids (b) diatoms (c) dinoflagellates (d) stoneworts 11, organisms (d) all of the above A spherical bacterium is called a (a) bacillus (b) coccus (c) spirillum (d) none of the above 6.
Explanation / Answer
1. Cynobacteria is a group or domain of bacteria that has photosynthetic ability.
2. A pathogen is a the group of microorganisms that causes disease.
3. Oscillatoria is a cyanobacterium, hence it is a photoautotroph.
4. Dead plants and animals are decomposed by natural decomposers like bacteria.
5. Nitrogen fixation is performed by both cyanobacteria and symbiotic bacteria like Rhizobium. Nitrogen fixation is performed by some bacteria only. So all the above is true.
6. Coccus means spherical, therefore, a bacterium having spherical morphology is called -coccus.
7. Gram staining is used to distinguish between gram positive and gram negative bacteria.
8. Tiny locomotive structures on organisms are called flagella and they belong to phylum Euglenozoa.
9. A vector does not cause a disease but it transmits the disease from one organism to the other.
10. Malaria is caused by a pathogen Plasmodium vivex, which is carried by mosquitoes. Hence all the above is true.
11. Silica from diatoms is used in toothpaste for its abrasive properties.
12. Red tides are caused when population of dinoflagellates explodes and causes algal bloom.
13. Agar is derived from red algae which belong to phylum Rhodophyta.
14. Algae is the plural form while alga is a singular form.
15. Phycobillins are blue and red photosynthetic pigments found in the red algae. Hence all the above is true.
16. Algin or alginic acid is derived from brown algae. It is used in ice-cream as stabilizer, Hence both a) and b) are correct.
17. Oogonia are typically a rounded cell or sac containing one or more oospheres, which are the female sex organ of certain algae and fungi.
18. Methylene blue stains the stored lipids in green algal as black. It is also used for viability test of algal cells.
19. Unlike green plants where starch is synthesizeed in the plastid compartment. Algae synthesize its starch in cytoplasm.
20. Charophyta is a phylum of fresh water green (photosynthetic) algae and this is why it is most closely linked to the evolution of land plants.
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