Practice Questions

TLS Online TPP Program

#Question id: 1691

What is the structure recognized by the αβ T-cell receptor on the cell surface of an antigen-presenting cell?

#Unit 4. Cell Communication and Cell Signaling

Native protein antigen plus major histocompatibility complex (MHC) molecule
Processed (peptide) antigen plus MHC
Processed peptide antigen
Native antigen

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TLS Online TPP Program

#Question id: 19373

#Unit 12. Applied Biology

Third phase, in which all kinds of transgenes are being employed to either modify the quality/quantity of plant/animal produce or to make these organisms produce

TLS Online TPP Program

#Question id: 31312

#Unit 3. Fundamental Processes

IRESs are RNA sequences function like

TLS Online TPP Program

#Question id: 12525

#Unit 6. System Physiology – Plant

The role of ABA signaling during water stress in the guard cells in presence and absence of ABA;

a) Anion effl¬ux leads to depolarization of the plasma membrane, which drives K+ effl¬ux. The eff¬lux of ions (A– and K+) reduces the turgor pressure of guard cells, resulting in stomatal closure.

b) Both OST1 and CPKs phosphorylate and thereby activate plasma membrane anion channels, leading to ef¬flux of anions (A–). But this process can be inhibited directly by PP2Cs

c) Inhibition of PP2C activity releases the positive regulator kinase OST1 from inhibition, resulting in both phosphorylation and activation of NADPH oxidases (RBOHs)

d) RBOHs catalyze the formation of apoplastic reactive oxygen species (ROS), which triggers opening of plasma membrane Ca2+-permeable ion channels

e) The resulting elevation of cytosolic Ca2+ leads to activation of calcium-dependent protein kinases (CPKs), which can also activates the RBOH proteins further promoting Ca2+ infl¬ux into the cytosol.

Which statements belongs to the presence and absence of ABA during signalling;

I. In presence of ABA

II. In absence of ABA

Which of the following combination from the given above statements is correct?

TLS Online TPP Program

#Question id: 19797

#Unit 12. Applied Biology

Which type of cry genes are used for the production of transgenic plants

TLS Online TPP Program

#Question id: 1526

#Unit 4. Cell Communication and Cell Signaling

Following statements are regarding to apoptosis.

A. In the worm apoptotic pathway, CED-3 (caspase-9 in mammals) is a protease required to destroy cell components during apoptosis.

B. CED-4 (Apaf-1) was able to accelerate the autoproteolytic cleavage and activation of purified CED-9

C. Once EGL-1 causes dissociation of the CED-4/CED-9 complex, the released CED-4 dimer joins with three other CED-4 dimers to make an octamer, which then activates CED-3

D. Many apoptotic stimuli lead to damage of the outer mitochondrial membrane, causing release into the cytosol of several proteins that stimulate apoptosis. In particular, cytochrome c released from mitochondria activates Apaf-1, which in turn activates caspase-3 and 7.

Which of the following combination is incorrect?