When a chromosome,which appears like beads on a string,is observed under an electron microscope,what is this structure called?

At which position does the phosphate group attach to the pentose sugar in a nucleotide?

Define and explain: Gene and Split gene.

In a structural gene,the template $DNA$ strand has the nucleotide sequence $3'-ATGCATGCATGCATGC-5'$. Find the correct and complementary nucleotide sequence on the coding strand.

Which one of the following nitrogenous bases is $NOT$ a component of $RNA$?

The mean diameter of the $DNA$ double helix is: