Q) The formation of endospores is an example of cell differentiation in bacteria
ID: 194318 • Letter: Q
Question
Q) The formation of endospores is an example of cell differentiation in bacteria. Which of the following are true statements about endospores?
a. all species of Gram-positive bacteria can undergo cell differentiation to produce endospores
b. the formation of endospores occurs through an asymmetrical cell division process that produces a forespore and ultimately an endospore
c. bacterial spores are resistant to heat, but not desiccation
d. these are all true statements
130. A water sample was serially diluted and these dilutions were plated on agar media as depicted below. Thirty colonies grew on the plate inoculated with one ml of the 10-3-4 dilution. How many bacterial cells were present in the original sample of water? a) 3 × 1e+ cells per ml b) 3 × 105 cells per ml c) 3 × 165 cells per ml d) 3 × 167 cells per ml 1 ml 1 ml 1 ml 1 ml 1 ml Original inoculum 9 ml broth in each tube Dilutions 1:10 1:100 1:1000 1:10,000 1:100,000 1 ml 1 ml 1 ml 1 ml 1 ml Plating 1:10 (10-1) 1:100 (10-2) 1:1000 (10-3) 1:10,000 (10-4) 1:100,000 (10-5)Explanation / Answer
30 colonies were found in plate corresponding to tube of serial dilution 10,000. Hence concentration of bacterial cells originally present = 3 * 105 cells per ml ANSWER
The formation of endospores is an example of cell differentiation in bacteria: the formation of endospores occurs through an asymmetrical cell division process that produces a forespore and ultimately an endospore ANSWER
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