Which of the following are true for an element?

(i) Atomic number = number of protons + number of electrons

(ii) Mass number = number of protons + number of neutrons

(iii) Atomic number = number of protons = number of neutrons

(iv) Atomic number = number of protons = number of electrons

(a) (i) and (ii)

(b) (i) and (iii)

(c) (ii) and (iii)

(d) (ii) and (iv)

TLS Online TPP Program

#Id: 9279

#Section 2: General Biology

The binding of Nod factors to the Nod factor receptors (NFRs), which contain extracellular LysM motifs, initiates an interaction with the conserved SYMRK receptor-like kinases containing a leucine-rich repeat (LRR) domain.

TLS Online TPP Program

#Id: 9280

#Section 2: General Biology

The interaction between NFR and SYMRK initiates calcium spiking in the nucleus, presumably via a second messenger molecule.

Core symbiotic genes are activated.

Cytokinin signaling is initiated.

TLS Online TPP Program

#Id: 9281

#Section 2: General Biology

Root hair cellular responses to bacterial Nod factor

TLS Online TPP Program

#Id: 9282

#Section 2: General Biology

Plant genes expressed early, or in the absence of bacterial infection, are termed “early nodulins” or ENOD

TLS Online TPP Program

#Id: 9283

#Section 2: General Biology

Three factors are important in maintaining low O2 concentrations in nodules. 

First, entry of O2 into the nodule is controlled by a variable‐permeability barrier in the nodule parenchyma

TLS Online TPP Program

#Id: 9284

#Section 2: General Biology

O2‐binding plant protein Lb plays an active role in regulating and delivering O2 in the infected cells

Bacterial respiration is the major O2 sink