The pathway for polypeptides exported from E. coli includes the following steps, which occur in what order for correct export?

1.  A chaperone, SecA, binds to the polypeptide.

2.  A chaperone, SecB, binds to the polypeptide.

3.  ATP is hydrolyzed by Sec A.

4.  SecA pushes 20 amino acids of the polypeptide into the translocation complex.

TLS Online TPP Program

#Question id: 315

#Unit 1. Molecules and their Interaction Relevant to Biology

Which is not a proper way to form a hydrogen bond? (The symbol ʺRʺ represents a general organic group. The hydrogen bonding is represented by dashed lines.)

TLS Online TPP Program

#Question id: 316

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of these noncovalent forces in biological systems is usually the strongest?

TLS Online TPP Program

#Question id: 317

#Unit 1. Molecules and their Interaction Relevant to Biology

Hydrogen bonds can occur when hydrogen is covalently bonded to atoms like nitrogen and oxygen. What property of nitrogen and oxygen is important for this?

TLS Online TPP Program

#Question id: 318

#Unit 1. Molecules and their Interaction Relevant to Biology

Attractions of oppositely charged functional groups of proteins are sometimes called ________.

TLS Online TPP Program

#Question id: 319

#Unit 1. Molecules and their Interaction Relevant to Biology

London dispersion forces are attractive forces that arise due to

TLS Online TPP Program

#Question id: 320

#Unit 1. Molecules and their Interaction Relevant to Biology

The aggregation of nonpolar molecules or groups in water is thermodynamically due to the