Chapters 5 and 6

RNA and DNA are made up of:

• Nucleotides

• Proteins

• Amino acids

• Polysaccharides

In DNA, G and C bases are connected by _(#) hydrogen bonds

In DNA, A and T bases are connected by _(#) hydrogen bonds

What is intragenic DNA?

Hoechst stain, ethidium bromide, fluorescence in stu hybridization, and geisma stains are used to:

• Stain DNA

• Read DNA sequences

• Block DNA transcription

• Prevent DNA damage

What is one thing you know about nucleosomes or chromatin?

Heterochromatin:

• is "on"

• is "off"

• has tightly packed histones

• has relatively farther apart histones

Euchromatin:

• is "on"

• is "off"

• has densely packed histones

• has histones relatively farther apart

Methylation of DNA usually

• makes it heterochromatin ("off")

• makes it euchromatin ("on")

Acetylation of DNA usually:

• Makes it euchromatin ("on")

• Makes it heterochromatin ("off")