The lactose operon is most likely to be transcribed when

During _______, RNA polymerase synthesizes a molecule of RNA using DNA as a template.

The consequence of nondisjunction in chromosome 21 in humans is ___.

During DNA replication in E.coli, which enzyme opens up the two strands of the DNA double helix?

The display of chromosomes shown below is a ____. karyotype.png 

The tryptophan operon is a repressible operon that is _________.

Acetylation of histones may result in __________.

The gene for this protein is found to be mutated in approximately 50% of all cancers. The protein or protein complex from this gene functions in the cell to stop cell division if the cell has experienced extensive DNA damage. What is it called?

Which enzyme adds new nucleotides to the end of a growing strand during DNA replication in E.coli?

An extra autosome ___