Exam 2: DNA and RNA: Composition and Structure

Which of the following statements about supercoiling of DNA are true? (1) Supercoiled DNA differs in linking number from relaxed DNA. (2) Supercoiled DNA can be relaxed through the action of topoisomerases. (3) All DNA in the cell is positively supercoiled. (4) A negatively supercoiled DNA is more difficult to unwind.

Restriction endonuclease is best defined as

The stability of the DNA double-helix is due to

All of the following statements concerning the Watson-Crick Model of DNA structure are true EXCEPT

The hyperchromic effect refers to:

Which of the following is not characteristic of tRNAs?

Which of the following is a ribonucleoside which contains an amino group?

In the conversion of B-DNA to Z-DNA, all of the following make contributions EXCEPT

Regarding tRNA structure, which of the following statements is correct?

Which one of the following statements is true? In chromatin folding, the structure called a solenoid

Which one of the following nitrogenous bases has an amino group at position 2 and an oxygen at position 6?

Restriction enzymes are:

The type of nucleic acid that may contain small quantities of a variety of modified ribonucleotides is

Heterogeneous nuclear RNA (hnRNA) can contain all the following EXCEPT

Which of the following statements uniquely applies to eukaryotic mRNA when compared to eukaryotic rRNA and tRNA?

One of the following five statements describing the Watson-Crick model for double stranded DNA is incorrect. INDICATE THE INCORRECT STATEMENT

The melting temperature of DNA (Tm) can be used to determine the

Which of the following statements best supports the Watson-Crick structure of DNA?

Restriction enzymes have all of the following characteristics EXCEPT that they cut

The major structural protein component(s) of chromatin are