While the amount of DNA doubles during the S phase, the number of chromosomes remains the same. In which subsequent phase does the actual separation of sister chromatids occur, effectively doubling the chromosome count temporarily?

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#Question id: 40227

#Applied Microbiology

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

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#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.

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#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.

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#Question id: 40230

#Applied Microbiology

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

List-I (Structure/Enzyme)	List-II (Microorganism)
(A). Heterocyst	(I). Rhizobium
(B). Leghaemoglobin	(II). Anabaena
(C). Respiratory Protection	(III). Clostridium
(D). Anaerobic N-fixation	(IV). Azotobacter

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#Question id: 40231

#Botany

Match List-I with List-II

LIST-I (Plant Name)	LIST-II (Family)
A. Arachis hypogaea (Groundnut)	I. Pedaliaceae
B. Sesamum indicum (Sesame)	II. Malvaceae
C. Linum usitatissimum (Flax)	III. Fabaceae
D. Gossypium hirsutum (Cotton)	IV. Linaceae

Choose the correct answer from the options given below:

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#Question id: 40232

#Applied Microbiology

In SDS-PAGE, which of the following reagents is specifically responsible for unfolding the tertiary structure of proteins by coating them with a uniform negative charge?