What structural component does $\mathrm{RNA}$ have that $\mathrm{DNA}$ does not?

Which of the following are the three components that make up a nucleotide?

Which of the following is a substrate for DNA polymerase?

Which of the following describes $\mathrm{RNA}$?

In the process of reverse transcription, what does reverse transcriptase use as a template to synthesize $DNA$?

What is the name of the enzyme that synthesizes complementary $\mathrm{DNA}$ ($\mathrm{cDNA}$) from an $\mathrm{mRNA}$ template?

Which PCR step causes the denaturation of double-stranded $D^{N}A$?

Which technique is commonly used to separate $DNA$ fragments based on their size?

Why does $\mathrm{DNA}$ move from the negative end of the gel to the positive end during gel electrophoresis?