Typically, mutations that modify the active site of an enzyme are more likely to be harmful than mutations that affect other parts of the enzyme. A hypothetical enzyme consists of four domains (A—D), and the amino acid sequences of these four domains have been determined in five related species. Given the proportion of amino acid homologies among the five species at each of the four domains, which domain probably contains the active site?

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#Question id: 19308

#Unit 4. Cell Communication and Cell Signaling

Match the following;

Column A	Column B	Column C
A) Attack strategy	i) Secreted cell wall-degrading enzymes ii) Intimate intracellular contact with plant cells iii) Initial biotrophic phase	a) Necrotrophy
		b) Biotrophy
B) Host range	iv) Intermediate v) Narrow vi) Broad	c) Hemibiotrophy

TLS Online TPP Program

#Question id: 19105

#Unit 4. Cell Communication and Cell Signaling

The type III secretion system (T3SS), to deliver bacterial effector proteins into the plant cell have been identified to be secretion of enzymes which causes dead of the plant, these enzymes are;

a) Phosphatases

b) Proteases 

c)  Lyases

d) Isomerase

e) Ligase

TLS Online TPP Program

#Question id: 19104

#Unit 4. Cell Communication and Cell Signaling

The structural components of the T3SS are encoded by the clustered gene known as

TLS Online TPP Program

#Question id: 19103

#Unit 4. Cell Communication and Cell Signaling

During infection, most bacteria remain in extracellular spaces and use a specialized mechanism, to deliver bacterial effector proteins into the plant cell that is

TLS Online TPP Program

#Question id: 19102

#Unit 4. Cell Communication and Cell Signaling

Phytoplasmas are specialized bacteria that are obligate parasites of the phloem tissue. They are mainly spread by these insects except;

TLS Online TPP Program

#Question id: 19101

#Unit 4. Cell Communication and Cell Signaling

which are specialized bacteria that are obligate parasites of the phloem tissue?