Practice Questions

TLS Online TPP Program

#Question id: 3783

What is the basis for the difference in how the leading and lagging strands of DNA molecules are synthesized?

#Unit 3. Fundamental Processes

The origins of replication occur only at the 5′ end.
Helicases and single-strand binding proteins work at the 5′ end.
DNA polymerase can join new nucleotides only to the 3′ end of a pre-existing strand, and the strands are antiparallel.
DNA ligase works only in the 3′ → 5′ direction.

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TLS Online TPP Program

#Question id: 33405

#Unit 1. Molecules and their Interaction Relevant to Biology

Which one of the following defines the psi angle in the protein backbone?

TLS Online TPP Program

#Question id: 33406

#Unit 1. Molecules and their Interaction Relevant to Biology

If Phi is fixed at 0º, then which of the following is correct

a. Clashes occur at ALL Psi angles.

b. Phi = 0º is physically impossible.

c. Clashes occurs at +10º to -130º

d. Clashes occurs at -90º to -180º

TLS Online TPP Program

#Question id: 33407

#Unit 1. Molecules and their Interaction Relevant to Biology

Psi is fixed at +165º. Then

TLS Online TPP Program

#Question id: 744

#Unit 1. Molecules and their Interaction Relevant to Biology

In a DNA molecule, deoxyribonucleotides are joined into a polymer by the covalent linkage of a phosphate group. The covalent link termed as:

TLS Online TPP Program

#Question id: 745

#Unit 1. Molecules and their Interaction Relevant to Biology

The structure of RNA differs from that of DNA, as RNA contains:

TLS Online TPP Program

#Question id: 746

#Unit 1. Molecules and their Interaction Relevant to Biology

Two separate chains of DNA are wound around each other, each following a helical (coiling) path, resulting in: