Solve the following multiple choice questions please microbi

9. The DNA of three organisms has been sequenced. If organism A shares 1046 identical uences with organism B 2050 with organism you can interpret this to means A is more related to B than to A is more related to c than to B, (c) A is clearly used to o B or C, drAischarly related to B and C, (e) this technique cannot be obtain this information. 10. The organism that produces an exotoxin that blocks the neuromuscular junction resulting in sustained muscle c is: (a) Clostridium tetany, (b) um botulinum, (c) the agent that causes anthrax d Clostridium sporogenes, (e) the agent causes gas gangrene 11. A mixed culture is: (a) the same as a contaminated culture, (b) ofe that has been containing stirred, that contains two or more pond one unknown algae and pl ne that contains a single known ofganism and 12. A specimen is coated with a metal so that 3-D image results. The image is magnified 25,000 times. describes bright field contrast microscope, microscope, transmission microscope,Oscanning electron 13, Mycoplasmas are bacteria that lack cell walls. On the basis of this ctural feature, which statement conceming mycoplasmas should be true are g are subject to lysis in hypotonic conditions, they lack cell met ative, (b) they as well, (d they undergo ready fossilization in sedimentary rock, (e) they possess typical pro flagella. 4. Acid fast organism: (a stain red with the acid fast stain, (b) include members of the staphylococci, ma. (c) include the nism that causes tuberculosis, (d) include most of the (e) A and f A and Care true. The original distinction between the two types of cells, prokaryotic and eukaryotic, was made on the basis of the: (a) structure of the cell wall, (b absence or presence of mitochondria, O absence or presence of a nuclear membra (d absence or presence of ribosomes (e) structure of the cell membrane. 16. A smear flooded with Sudan black and rinsed with water. is most appropriately called an example of Gram stain, (b) acid fast stain, Oflagellar s negative stain, (e) fat stain 17 An arrangement of flagella that is characterized by flagella on all surfaces of the bacterial cell is called: (a) atrichous, (b) peritrichous, (e) lophotrichous (e) monotrichous. A protoplast: (a) is a gram positive cell without the cell wal attached to a cell membrane s formed when mycoplasma are (d) is usually a rod, (e) is usually 70s in size has bits of cell wal ped of their cell wal

Solution

9. b. A is more related to C than to B.

10. b. Chlostridium.botulinum exotoxin

11.c. One that contain two or more known species.

12.e. Scanning electron microscope

13.b. They are subject to lysis in hypotonic conditions.

14. f. a and c

16. e. Fat stain

17. b. Peritrichous

18. a.