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TLS Online TPP Program

#Question id: 3869

Which one of the following statements about E. coli RNA polymerase (core enzyme) is false?

#Section 3: Genetics, Cellular and Molecular Biology

  1. It can start new chains de novo or elongate old ones.

  2. It has no catalytic activity unless the sigma factor is bound.

  3. It uses nucleoside 5'-triphosphates as substrates.

  4. Its activity is blocked by rifampicin.

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TLS Online TPP Program

#Question id: 2144

#Section 2: General Biology

The type of membrane transport that uses ion gradients as the energy source is:
TLS Online TPP Program

#Question id: 2145

#Section 2: General Biology

An electrogenic Na+ transporter:
TLS Online TPP Program

#Question id: 2146

#Section 2: General Biology

In one catalytic cycle, the Na+/K+ ATPase transporter transports:
TLS Online TPP Program

#Question id: 2147

#Section 2: General Biology

Movement of water across membranes is facilitated by proteins called:
TLS Online TPP Program

#Question id: 2148

#Section 2: General Biology

The specificity of the potassium channel for K+ over Na+ is mainly the result of the:
TLS Online TPP Program

#Question id: 2149

#Section 2: General Biology

A ligand-gated ion channel (such as the nicotinic acetylcholine receptor) is: