Practice Questions

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#Question id: 30114

In the case of monoclonal antibody production by hybridoma technology, myeloma cells used lack the enzyme hypxanthine - guanine phosphoriboxyl transferase(HGPRT) such that fused cells can only survive when selected on hypoxanthine-aminopterinthymdine (HAT). What is the role of aminopterin in this medium?

#Unit 1. Molecules and their Interaction Relevant to Biology

To be used as cell cycle inhibitor of myeloma cells.
To block the pathway for nucleotide synthesis.
To facilitate fusion of Myeloid B cells and antibody producing B cells.
To facilitate production of antibody producing B cells.

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TLS Online TPP Program

#Question id: 29435

#Unit 6. System Physiology – Plant

Flavonoid's compound release by host plant are given match the following

TLS Online TPP Program

#Question id: 29436

#Unit 6. System Physiology – Plant

Which of the following is incorrectly paired

a. NodA is an N-acyltransferase

b. NodB is a chitin-oligosaccharide deacetylase

c. NodB is a N-acyltransferase

d. NodC is a chitin-oligosaccharide synthase

f. NodC is a chitin-oligosaccharide deacetylase

TLS Online TPP Program

#Question id: 29437

#Unit 6. System Physiology – Plant

Important chemical reactions involved in Nitrate assimilation at roots are given

a. a & b both is Nitrate reductase

b. a & b both is NADPH nitrite reductase

c. a is Nitrate reductase and reaction takes place in plastid

d. a is Nitrate reductase and b is NADPH nitrite reductase

Choose the correct statement made regarding the above reactions of the following

TLS Online TPP Program

#Question id: 29438

#Unit 6. System Physiology – Plant

Symbiotic nitrogen fixation in legume nodules involves Root hair cellular responses to bacterial Nod factor and this response is time-based phenomenon

Match the Response with their appropriate timing

TLS Online TPP Program

#Question id: 29439

#Unit 6. System Physiology – Plant

Nitrogenase, a complex metal containing enzyme is involved in conversion of N2 to NH3•

a. Nitrogenase is composed of two component proteins

b. Nitrogenase is a complex consisting of the MoFe protein (dinitrogenase or component I) a heterotetramer

c. Nitrogenase is a complex consisting of the MoFe protein (dinitrogenase or component I) a heterotetramer

d. Fe protein (dinitrogenase reductase or component II) a heterodimer

Which of the combination of above statement about Nitrogenase is INCORRECT

TLS Online TPP Program

#Question id: 29440

#Unit 6. System Physiology – Plant

Nitrogenase is a complex consisting of the

(a) MoFe protein (dinitrogenase or component I) a heterotetramer

(b) the Fe protein (dinitrogenase reductase or component II) a heterotetramer

(c) MoFe protein (dinitrogenase or component I) a homodimer.

(d) the Fe protein (dinitrogenase reductase or component II) a homodimer

Which of the following is correct