#Question id: 10371
#Unit 6. System Physiology – Plant
There are three essential nod gene for every bacterial species that is−NodA, NodB and NodC, that are required for synthesizing this basic structure such as;
a) NodA is an N-acyltransferase that catalyzes the addition of a fatty acyl chain
b) NodB is a chitin-oligosaccharide synthase that links the acetyl group of the terminal nonreducing sugar
c) NodC is a chitin-oligosaccharide synthase that links N-acetyl-D-glucosamine monomers
d) NodB is a chitin-oligosaccharide deacetylase that removes the acetyl group from the terminal nonreducing sugar
e) NodC is a chitin-oligosaccharide deacetylase that removes links N-acetyl-D-glucosamine monomers
Which of the following statements about NOD Factor is incorrect?
#Question id: 10367
#Unit 6. System Physiology – Plant
Cyanobcteria also fixes nitrogen under anaerobic conditions without heterocyst where?
#Question id: 10366
#Unit 6. System Physiology – Plant
Cyanobacteria can fixes nitrogen in an anaerobic conditions. Which of the following statements about heterocyst which is specialized cell of blue-green algae is incorrect?
#Question id: 10365
#Unit 6. System Physiology – Plant
Why the nitrogenase enzymes catalyzes the nitrogen fixation reaction only in microanaerobic or anaerobic conditions?
#Question id: 10364
#Unit 6. System Physiology – Plant
Which of the following is the most common type of symbiosis occurs between members of the plant family and soil bacteria?
#Question id: 10363
#Unit 6. System Physiology – Plant
Free living nitrogen fixing takes place as shown in the following;
TYPE
N-FIXING GENERA
A)
Cyanobacteria (blue-green algae) i)
Bacillus
B)
Aerobic
ii)
Clostridium
C)
Facultative
iii) Anabaena
D)
Anaerobic nonphotosynthetic iv)
Rhodospirillum
E)
Anaerobic photosynthetic
v) Azospirillum