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mezya [45]
3 years ago
6

Suppose you were interested in the effect of breastfeeding versus formula feeding on the composition of gut flora in newborns. A

s part of your experiment, stool samples from healthy babies in the study get plated on various agar media. You notice that greater numbers of colonies are recovered when samples are plated on blood agar compared to Luria Bertani (LB) agar. After some diligent subculturing, you isolate several bacterial species capable of slow growth on the blood but not on the LB agar. You correctly surmise that these organisms
Choose one:
A. are opportunistic blood pathogens.
B. should be classified as beta-hemolytic.
C. have extensive and complex nutritional requirements not met by LB agar.
D. grow because the blood agar suppresses the growth of faster-growing bacteria.
E. are Gram-positive and, thus, inhibited by the ingredients in LB agar.
Biology
1 answer:
xxMikexx [17]3 years ago
8 0

Answer:

Option (C).

Explanation:

Luria Bertani is a rich nutritional medium generally used for the growth of bacteria. This media was created by Giuseppe Bertani.

Bacteria shows slow growth on blood but can grow grow easily in LB agar because they have complex and extensive requirement that cannot be met by LB agar. Blood agar is more enriched media and can grow the bacteria that are dependent upon the host organism.

Thus, the correct answer is option (C).

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Answer:

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This technology emerged in 1984 and invented by Professor Sir Alec Jeffreys who realized that you could detect variations in human DNA, in the form of these mini-satellites to produce a pattern unique to an individual

Human error still plays a role in terms of lab staff who make errors in conducting the DNA analysis, interpreting it or reporting the results of the analysis sometimes it occurs in entering the resulting DNA profile into a DNA database system which may result from a failure to comply a procedure, misjudgement, or some other mistake. There are protocols and precautions which can be introduced to minimise the opportunity for error during analysis or interpretation, however, the potential for human error cannot be fully eliminated.

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