Practice Questions

TLS Online TPP Program

#Question id: 2149

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

#Section 2: General Biology

a charged lipid in the membrane bilayer that allows ions to pass through.
a membrane protein that permits a ligand to pass through the membrane only when opened by the appropriate ion.
a membrane protein that permits an ion to pass through the membrane only when opened by the appropriate ligand.
a molecule that binds to the membrane thereby allowing ions to pass through.

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TLS Online TPP Program

#Question id: 21732

#Section 5: Bioprocess Engineering and Process Biotechnology

Rate constants for the first-order decomposition of acetonedicarboxylic acid

CO(CH2COOH)2(aq) → CO(CH3)2(aq) + 2 CO2(g)

are k = 4.75 ×10^–4s^–1 at 293 K and k = 1.63 ×10^–3 at 303 K. What is the activation energy, Ea, for this reaction?

TLS Online TPP Program

#Question id: 648

#Section 2: General Biology

Enzyme catalysis is regulated by a number of mechanisms. Also, the flux through metabolic pathways must be regulated. Given the metabolic pathway below, which choice accurately describes the regulation of compound G levels?

TLS Online TPP Program

#Question id: 27356

#Section 3: Genetics, Cellular and Molecular Biology

What is the role of the guide RNA?

TLS Online TPP Program

#Question id: 12999

#Section 2: General Biology

Proline and glycine both disturb the symmetry of α-helix which of the following are true regarding to these two amino acids

a) proline changes the orientation of hetropolymeric α-helix hence proline can be placed only as 1st amino acid residue near to C-terminus

b) proline changes the orientation of polymeric α-helix hence proline can be placed only as 1st amino acid residue near to N-terminus

c) glycine disrupts the heteropolymeric α-helix by changing the helicity.

d) homopolymer of proline and glycine can form stable helix.