Unit 9

Which of the following is not true of RNA processing?

Exons are cut out before mRNA leaves the nucleus.

The template strand of a given gene includes the sequence 3'-G C C A C G T A T C A G-5'. What is The sequence of the non-template strand?

5'-C G G T G C A T A G T-3'

During DNA replication, the leading strand is synthesized continuously, while the lagging strand is synthesized as Okazaki fragments. This is because:

DNA synthesis can take place only in the 5' to 3' direction.

DNA is made up of nucleotides. Which of the following correctly list some of the components of a nucleotide?

Deoxyribose sugar, phosphate, nitrogenous base

DNA has two functions: it Can self replicate and it acts as a template for the transcription of RNA. DNA is capable of these functions because:

Its nucleotides can base-pair with both ribose and deoxyribose nucleotides.

During what phase of the cell cycle does DNA replication occur?

S phase or synthesis

What is meant by the description "antiparallel" regarding the strands that make up DNA?

The 5' to 3' direction of one strand runs counter to the direction of the other strand

In a healthy cell, the rate of DNA repair is equal to the rate of DNA mutation. When the rate of repair lags behind the rate of mutation, what is a possible fate of the cell?

The cell can be transformed to a cancerous cell.

Enzymes that break down DNA catalyze the Hydrolysis of the covalent bonds that join nucleotides together. What would happen to DNA molecules treated with these enzymes?

The phosphodiester linkages of the polynucleotide backbone would be broken.

Which of the following components does not form part of the transcription complex at a eukaryotic promoter?

transfer RNA