QUESTION 9 Most (if not all) pathogens are mesophilic O A. True B. False QUESTIO
ID: 278619 • Letter: Q
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QUESTION 9 Most (if not all) pathogens are mesophilic O A. True B. False QUESTION 10 No energy is produced by the Krebs cycle O A. True B.False QUESTION 11 which of the following cell types is prokaryotic? O A Animal B. Plant C.Fung D Bacteria ??.Furgi QUESTION 12 Only anaerobic bacteria produce energy by glycolysis, since this is their sole source of energy O A. True B. Faise QUESTION 13 Which bacterial morphology would be demonstrated as chains of spheres? OB Staphylococcus C Streptobacillus Click Save and Submit to save and submit, Click Save All Ansvers to save all answers. 2013ppt IAExplanation / Answer
Q. 9. True
Mesophiles are the organisms which grow better between temperatures of 25-45 0C. Most human pathogens are mesophiles as the body core temperature 37 C supports the growth of pathogenic microorganisms
Q. 10 True
No ATP is actually obtained from the Krebs cycle as the ATP is only released when NADH and FADH2 enters the Electron transport chain. So, it can be concluded that no energy is actually produced in the Krebs cycle
Q. 11. Option D Bacteria
Prokaryotic cells do not have membrane bound organelles and lack distinct nucleus as they lack the nuclear membrane. Examples of prokaryotes are bacteria, archaea. Hence, option D is the correct answer. Eukaryotes have distinct nuclear membrane and internal cellular organelles. Examples are protists, fungi, plant and animal cells.
Q.12. Option B. False
Part of the statement is true as anerobic bacteria depend on glycolysis (glycolysis does not require oxygen) as it is the sole source of energy. But it is false because not only bacteria but also certain anaerobic organisms such as fermentation yeasts and in other organisms where oxygen is temporarily unavailable
Q 13. Option A. Streptococcus
Cocci is used to describe spherical morphology while bacillus is used to describe rod shaped morphology. Hence, option c, d can be eliminated. Since, Staphylo means clustered like grapes and Strepto means cells arranged in a chain, the correct answer is Option A
Q 14. Option A. Peptidoglycan
Gram positive bacterial cell wall consists of many layers of peptidoglycan forming a thick rigid structure. Along with peptidoglycan, techoic acids and phosphates are also present in gram positive cell wall. Lipopolysaccharides and lipoproteinsa are present in gram negative cell wall. Plasma membrane is present in both. Hence, option A is the correct answer.
Q 15. Option B Pilus
Pilus is a protein tube which protrudes from the cytoplasmic membrane in all the gram negative bacteria which forms channels with adjacent cells to retrieve genetic information or DNA. Hence, option B is the correct answer. Flagellum are helpful in locomotion while contractile filament which is present in the center of flagellum is called as axial filament. Fimbria are made up of proteins and involved in attachment to surface and movement.
Q. 16. Option D. More than one of the above
Mannitol salt agar (MSA) medium is both selective and differential medium. MSA medium allows only Staphylococci to grow thus having the selective function and its ability to distinguish between different strains of Staphylococci (S. aureus turns yellow in MSA medium while S. Epidermis stays red) makes it differential medium. Hence, the answer is option D as MSA is both selective as well as differential
Q 17. Option E
Water, Nitrogen, Carbon and inorganic ions like Sodium, Calcium, Potassium, Chloride etc are all essential for bacterial growth which is the reason why they are supplemented in nutritional agar medium or peptone broth whose composition provides all the above mentioned requirements.
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