A covalent bond is a chemical bond that occurs when two or more atoms share electrons. The sharing of electrons helps complete the outer shell, or valence shell, of both atoms. The sharing of electrons creates a stable balance of attractive and repulsive forces between atoms.

TLS Online TPP Program

#Id: 9272

#Section 2: General Biology

TLS Online TPP Program

#Id: 9273

#Section 2: General Biology

TLS Online TPP Program

#Id: 9274

#Section 2: General Biology

Bacterial Nod genes are activated to initiate nodulation in plants by plant signals flavonoids

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#Id: 9275

#Section 2: General Biology

NodD proteins interact directly with the signals generated by the plants and activates most conserved Nod ABC genes in bacteria

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#Id: 9276

#Section 2: General Biology

NodA is an N-acyltransferase that catalyzes the addition of a fatty acyl chain.

NodB is a chitin-oligosaccharide deacetylase that removes the acetyl group from the terminal nonreducing sugar.

NodC is a chitin-oligosaccharide synthase that links N-acetyl-D-glucosamine monomers.

TLS Online TPP Program

#Id: 9277

#Section 2: General Biology

Nod factor is b-1,4-linked N-acetyl-D-glucosamine backbone