53) In the process of transcription, promoters are specific sequences of that ar

Question

53) In the process of transcription, promoters are specific sequences of that are recognized by a. DNA / DNA polymerase b. RNA / DNA polymerase c. DNA /sigma factors of RNA polymerases d. RNA RNA polymerase e. RNA /ribosomes 54) Which of the following statements is true with respect to heterotrophic organisms? a. They have the ability to use either preformed organic compounds as sources of carbon or b. c. d. they can fix carbon dioxide from the atmosphere during photosynthesis. They invariably ferment carbon-containing substrates. They use preformed organic compounds as sources of carbon. They prefer bacterial cells of the opposite sex during the process of reproduction 55) generating a great deal of heat in metabolism a. b. c. producing CH4, which is a greenhouse gas. using the greenhouse gas CO2 providing nutrients for plant growth oxidizing CHa. 56) Due to global warming permafrost soils are thawing, resulting in the production and release of what gas/gases into the atmosphere? a. b. c. d. e. methane carbon dioxide nitrogen (a) and (b) (a), (b) and (c)

Explanation / Answer

53. c. DNA/ sigma factors of RNA polymerases.

Promoters are present in DNA, so they are DNA sequences and Sigma factor of RNA polymerase actually recognize promoters which are later removed during the initiation phase.

54. c. They use preformed organic carbon as sources of carbon

Heterotrophs do not perform photosynthesis, so they use preformed organic carbon compounds.

55. d. Oxidation of CH4.

Oxidation of methane is a highly exothermic process.

56. The d. (a) and (b)

Due to thawing of permafrost, more amount of carbon dioxide and methane are released into the atmosphere which in turn is increasing global warming.

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