What is the superhelical density of a closed-circular DNA with a length of 4,200 bp and a linking number (Lk) of 374? What is the superhelical density of the same DNA when Lk = 412? Are these molecules negatively or positively supercoiled?

A. The molecule is getting negatively supercoiled.

B. The molecule is getting positively supercoiled.

C. The superhelical density is positive.

D. The superhelical density is negative.

Which of the combinations of the above statements are correct?

#Question id: 807

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following forces can stabilize a normal DNA double-helix?

#Question id: 808

#Unit 1. Molecules and their Interaction Relevant to Biology

Which, if any, of the following statements is false?

#Question id: 809

#Unit 1. Molecules and their Interaction Relevant to Biology

A single-stranded DNA molecule contains 40 nucleotides with equal amounts of A, C, G, and T. This DNA strand can combine with a complementary DNA strand to form a double-stranded DNA molecule. Which of the following double-stranded DNA molecules would denature at a lower temperature than the 40 base-pair double-stranded molecule described above?

#Question id: 810

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following statements concerning the process of spontaneous folding of proteins is false?

#Question id: 811

#Unit 1. Molecules and their Interaction Relevant to Biology

Protein S will fold into its native conformation only when protein Q is also present in the solution.  However, protein Q can fold into its native conformation without protein S.  Protein Q, therefore, may function as a ____________ for protein S.

#Question id: 812

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is not known to be involved in the process of assisted folding of proteins?