Question

Question 26 Refer to the image below. Which of the plate quadrants is the most useful for isolation of a single colony? Not yet answered Points out of 1.00 P Flag question 1 2 4 3 Select one: a 1 b. 2 Oc.3 O d. 4

Answer 1

Question 26:

Correct answer is option d-4

Explanation: In quadrant four isolated pin point like colonies are observed which is suitable for isolation. one pin point like colony is derived from a single cell and chance of contamination is very low. In other quadrants no such pure pin point like circular colony is observed.

Question 27:

Correct answer is option b- carbon dioxide

Explanation: In most of the common fermentation, Carbon dioxide is the common product obtained. Other products include alcohol,(methanol or ethanol), or lactic acid , hydrogen gas.

Question 28:

Correct answer is option a -cell wall structure

Explanation: In Gram positive bacteria , cell wall of bacteria lack outer envelope made up of lipopolysachharides (LPS). In Gram Negative bacteria, due to presence of this compound in cell wall, prevents stating by Gram stain.

Question 29:

Correct answer is option e-PCR

Explanation: PCR analysis can produce billion copies of DNA in just a few hours. In PCR DNA replication occur in an exponential rate and thus rate of replication is huge.