Phloem loading in the apoplastic pathway thought to mediate the transport of sucrose from the apoplast into the sieve element– companion cell complex. Which of the following  are involved in such sucrose transporting by apoplast?

a) Sucrose is at a higher concentration in the sieve element–companion cell complex indicates that sucrose is actively transported against its chemical-potential gradient

b) Sugars transport from the apoplast into the sieve elements and companion cells energy driven process

c) Phloem loading in the apoplastic pathway involves a sucrose–H+ symporter

d) the route of phloem loading is−mesophyll cells→ bundle sheath cells→ phloem parenchyma cell→ ordinary companion cell→ sieve elements

Which of the following is incorrect?

TLS Online TPP Program

#Question id: 30113

#Unit 1. Molecules and their Interaction Relevant to Biology

Aspartate (Asp) is an amino acid with the structure NH2-CH(CH2-COOH)COOH. Given below are biosynthetic processes occurring in cells:

A. protein synthesis

B. de novo synthesis of inosine monophosphate and orotic acid

C. synthesis of adenosine monophosphate from inosine monophosphate

D. glutathione synthesis

Which one of the following options correctly represents all the biosynthetic process( es) wherein Asp is involved as a precursor?

TLS Online TPP Program

#Question id: 30114

#Unit 1. Molecules and their Interaction Relevant to Biology

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?

TLS Online TPP Program

#Question id: 30115

#Unit 1. Molecules and their Interaction Relevant to Biology

The antibacterial trimethoprim is an inhibitor of 

TLS Online TPP Program

#Question id: 30115

#Unit 1. Molecules and their Interaction Relevant to Biology

The antibacterial trimethoprim is an inhibitor of 

TLS Online TPP Program

#Question id: 30116

#Unit 1. Molecules and their Interaction Relevant to Biology

During purine synthesis the activity of amidotransferase enzyme is inhibited by the antitumor agent, mark the correct one.

TLS Online TPP Program

#Question id: 30117

#Unit 1. Molecules and their Interaction Relevant to Biology

Catabolic end product of purines is