List of top Microbiology Questions on Nitrogen cycle

Arrange the steps in antigen processing by endocytic pathway in correct order :
A. Recognition by CD4\(^+\) T cells
B. Antigen uptake by APC
C. Transport of MHC-peptide complex to cell surface
D. Peptide loading onto MHC class II molecule
E. Fusion of phagosome with lysosome
Choose the correct answer from the options given below :

Given below are two statements :
one is labelled as
Assertion (A) and the other is labelled as
Reason (R).
Assertion (A) :
Some microorganisms can use nitrate as a terminal electron acceptor under anaerobic conditions.
Reason (R) :
Nitrate can be fully reduced to ammonia in the process of denitrification.
In the light of the above statements, choose the most appropriate answer from the options given below :

Which one of the following is the correct sequence of a food chain?