It has been observed that organisms on islands are different from, but closely related to, similar forms found on the nearest continent. This is taken as evidence that

#Question id: 40225

#Applied Microbiology

Read the following statements regarding cloning vectors and select the correct option.

Statement I: Antibiotic resistance markers are essential for an expression vector but not necessary for a standard cloning vector.

Statement II: The presence of an antibiotic resistance gene allows transformed bacteria to survive on media containing the corresponding antibiotic.

#Question id: 40226

#Applied Microbiology

Assertion (A): When plating bacteria after a transformation experiment, adding ampicillin to the agar plates is crucial if the plasmid vector carries the ampR gene.

Reason (R): Ampicillin acts as a nutrient source for the bacteria that have successfully taken up the plasmid.

#Question id: 40227

#Applied Microbiology

Which of the following microorganisms is a free-living, aerobic, chemoorganotrophic nitrogen fixer?

#Question id: 40228

#Applied Microbiology

Consider the following statements regarding nitrogen-fixing bacteria:

• Statement I: Rhizobium forms a symbiotic association with leguminous plants and fixes nitrogen only within the root nodules.

• Statement II: Alcaligenes species are primarily known as anaerobic chemolithotrophs in the nitrogen cycle.

#Question id: 40229

#Applied Microbiology

Assertion (A): Photosynthetic bacteria like Rhodobacter can fix atmospheric nitrogen.

Reason (R): These bacteria possess the nitrogenase enzyme complex, which is sensitive to oxygen.

#Question id: 40230

#Applied Microbiology

Match the specialized structures/enzymes with the corresponding nitrogen fixer: