Question

QUESTIONS 5) Xochilt following media will be a better option for her to use? A) selective media C) selective and differential media wants to discover a microbe capable of degrading an environmental contaminant. Which of the B) enrichment media D) chemically defined media 1S) Which of the following methods would be best to sterilize a liquid growth media containing antibioties? A) filtration B) addition of alcoholC) autoclaving D) boiling 30) A microbiologist inoculates a growth medium with 100 bacterial cells/ml. If the generation time of the species is 1 hour, and there is no lag phase, how long will it be before the culture contains more than 10,000 cells/ml? A) 24 hours в) 3 hours C) 7 hours D) 2 hours 31) Which of the following is NOT a target of drugs that inhibit protein synthesis? A) interference with peptide bridges in peptidoglycan B) movement of the ribosome from one codon to the next C) the enzymatic site of the 50S ribosomal subunit D) the shape of the 30S ribosomal subunit 36) Aseptic means A) clean B) sterile. C) free of pathogens D) sanitized.

please can you explain the right answers?

Answer 1

answer 5 : option : chemically defined media

so that the student add the desired chemical for which the degradation rate by the discovered bacteria can be analysed

answer 15 : filtration because all the other methods will degrade the antibiotic such as autoclaving heating or alcohol

answer 31 : a interferes with peptide bridges in peptidoglycan because it is the part of cell wall synthesis and not related to protein synthesis in any way.

answer 36 : aseptic means c ) free from pathogens

answer 30: okay we know that

Nt = No ²ⁿ where

Nt = final no of cells = 10000

No = initial no of cell = 100

n = no of generations required to attain that final cell count

putting the values we get

10000 = 100 ²ⁿ

100 ² = 100 ²ⁿ

therefore 2n = 2

n = 2/2

n = 1 generation

1 generation = 1hour

so 10000 cells are produced in 1 hour and hence more than 10000 cells (according to the given question ) will be there in or before answer : 2 hours i.e more than 1 hour