1. What is the most useful and widely used gene for defining relationships of mi

Question

1. What is the most useful and widely used gene for defining relationships of microorganisms?

a. small subunit ribosomal RNAs

b. tRNA synthetases

c. protein synthesis elongation factor Tu

d. heat shock protein Hsp60

2. What would have been the most likely energy-generating metabolism in early cells?

a. exclusively aerobic

b. facultatively aerobic

c. exclusively fermentative

d. exclusively anaerobic

3. Which of the following does NOT lead to variability in the fatty acid profile of an organism?

a. medium composition

b. growth temperature

c. protein content in the sample

d. growth phase

Explanation / Answer

Que 1:

Ans:

The most useful and widely used gene for defining relationships of microorganisms is: small subunit ribosomal RNAs.

Explanation:

- In bacteria the gene that has proved to be the most informative for investigating evolutionary relatdness is 16S rRNA, a sequence of DNA that encodes the RNA component of smaller subunit of of the bacterial ribosome.

- The 16S rRNA gene is present in all bacteria, and a related form occur in all cells, including those of eukaryotes.

- Hence, correct option is a) small subunit ribosomal RNAS.

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