21. Dring which growth phase will gram-positive bacteria be most susceptible to

Question

21. Dring which growth phase will gram-positive bacteria be most susceptible to penicillin? a) Lag phase b) Log Phase c) Death phase d) Stationary phase e) The culture is equally susceptible during all phases 22. Which of the following is the best definition of generation time? . a) The length of time it takes for lag phase b) The length of time it takes for a cell to divide c) The minimum rate of doubling d) the duration of log phase e) The time it takes for nuclear division 23. All of the following are direct methods to measure microbial growth except: a) Direct microscopic coúnt b) Standard plate count c) Filtration d) Metabolic activity e MPN Which group of microorganisms is most likely to spoil a fresh water trout preserved with salt? a) Psychropiles b) Halophiles c) Anaerobes ay Thermophiles e) None of the above 24. 25. Which of the following is an example of a metabolic activity that could be used to measure microbial growth? a) Standard plate oount b) Glucose consumption c) Direct microscopic count d) Turbidity e) MPN

Explanation / Answer

21) Ans will be (b) i.e. log phase

During the exponential or log phase, cells divide at a constant rate and their numbers increase by the same percentage during each time interval. The generation time is measured during this period of active multiplication. Because bacteria are most susceptible to antibiotics like penicillin and other chemicals during this time, the log phase is important medically.

22) Ans will be (b) The length of time it takes for a cell to divide.

23) Ans will be (d) Metabolic activity because it is obvious that you cant measure microbial growth with their metabolic activity

24) Ans will be (b) Halophiles because Halophiles are organisms that thrive in high salt concentrations. They are basically "salt-loving" bacteria so they spoil a freshwater trout preserved with salt.

25) Ans will be (b) Glucose consumption, Because a study was conducted in vitro condition to determine the specific growth rate, sugar consumption and generation time of bacterial species, Growth of all bacterial strains was significantly affected by the sugars, so we can say that glucose consumption is the metabolic activity that could be used to measure microbial growth

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.