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TLS Online TPP Program

#Question id: 7140

In thinking about the development of the wing imaginal disc of Drosophila, what is the significance of 'compartments'?

#Unit 5. Developmental Biology
  1. A compartment is a signaling center that controls antero-posterior patterning
  2. Compartments are developmental units, in that the wing forms from the 'wing compartment'
  3. Compartments are epithelial sacs, set aside during embryogenesis, that will give rise to adult structures such as wings after metamorphosis.
  4. Since cells in adjacent compartments have different lineage histories, adjacent compartments can adopt different fates and differentiation patterns, as in the formation of the anterior and posterior portions of the wing blade.
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TLS Online TPP Program

#Question id: 11828

#Unit 6. System Physiology – Plant

Given some enzymes of ethylene biosynthetic pathway and its character;

A) ACC synthase                                                               i) It is an unstable, cytosolic enzyme. Its level is regulated by environmental and internal factors, such as wounding, drought stress, flooding, and auxin

B) ACC oxidase                                                                  ii) It catalyzes the last step in ethylene biosynthesis, the conversion of ACC to ethylene

                                                                                                iii) Its activity can be the rate-limiting step in ethylene biosynthesis

                                                                                                iv) That is encoded by a multigene family that is differentially regulated

                                                                                                v) It is present in such low amounts in plant tissues and is very unstable and also difficult to purify the enzyme  for biochemical analysis

                                                                                                vi) These enzymes belong to the Fe2+/ascorbate oxidase superfamily

Find out the correct combination from the given enzymes and its character?
TLS Online TPP Program

#Question id: 11829

#Unit 6. System Physiology – Plant

The certain cyclic olefin compounds, have been shown to block ethylene breakdown without inhibiting ethylene action?
TLS Online TPP Program

#Question id: 11830

#Unit 6. System Physiology – Plant

Not all the ACC found in the tissue is converted to ethylene, ACC can also be converted to a conjugated form, which does not appear to break down and accumulates in the tissue?
TLS Online TPP Program

#Question id: 11831

#Unit 6. System Physiology – Plant

A volatile compound is a strong competitive inhibitor of ethylene binding______
TLS Online TPP Program

#Question id: 11832

#Unit 6. System Physiology – Plant

Ethylene production and action can be inhibited by various types of inhibitors, some statements about  the inhibitor is given below, which one of the following is incorrect?
TLS Online TPP Program

#Question id: 11833

#Unit 6. System Physiology – Plant

Analysis of mRNA from tomato fruits from wild-type and transgenic tomato plants genetically engineered to lack ethylene has revealed that gene expression during ripening is regulated by at least two independent pathways;

I) Ethylene-dependent pathway

II) Ethylene-independent pathway

Some given genes involved in these two pathways,

a) ACC oxidase

b) respiratory metabolism

c) ACC synthase

d) chlorophyllase

e) lycopene and aroma biosynthesis

Which of the following is the correct combination from the given pathways and its included genes?