An experiment was done to see the effect of auxin: cytokinin ratios on morphogenesis can also be seen in crown gall tumors by mutation of the T-DNA of the Agrobacterium Ti plasmid,

I) Mutating the ipt gene (the tmr locus) of the Ti plasmid blocks zeatin biosynthesis in the infected cells

II) mutating either of the genes for auxin biosynthesis (tms locus)

Given some results about these above mutations ,

a) equal auxin to cytokinin ratio form undifferentiated callus tissue

b) high auxin:cytokinin ratio in the tumor cells causes the proliferation of roots instead of undifferentiated callus tissue

c) lowers the auxin:cytokinin ratio and stimulates the proliferation of shoots

What would be the result of these two mutation ?

TLS Online TPP Program

#Question id: 1298

#Unit 4. Cell Communication and Cell Signaling

As fibroblasts form a three-dimensional structure in contact with the ECM, the cells bound to ECM:

TLS Online TPP Program

#Question id: 1299

#Unit 4. Cell Communication and Cell Signaling

Pectins and hyaluronic acid are both:

TLS Online TPP Program

#Question id: 1300

#Unit 4. Cell Communication and Cell Signaling

Which of these is NOT a component of plant cell walls?

TLS Online TPP Program

#Question id: 1301

#Unit 4. Cell Communication and Cell Signaling

The cell walls of bacteria, fungi, and plant cells, and the extracellular matrix of animal cells are all external to the plasma membrane. Which of the following characteristics are common to all of these extracellular structures?

TLS Online TPP Program

#Question id: 1302

#Unit 4. Cell Communication and Cell Signaling

A mutation that disrupts the ability of an animal cell to add polysaccharide modifications to proteins would most likely cause defects in which of the following organelles or structures?

TLS Online TPP Program

#Question id: 1303

#Unit 4. Cell Communication and Cell Signaling

What is a primary function of integrins?