Ch. 5 Flashcards
G-C have how many Hydrogens bonds holding them together
3
A-T forms how many hydrogen bonds
2
Proteins are encoded by DNA sequence, which is produced through ______ intermediate
RNA
DNA in eukaryotic cells is packaged in _____
chromosomes
Packaging of DNA allows chromosomes to be ______ during cell division
seperated
segements of DNA that contain instructions for making a particular protein or RNA molecule
genes
the _____ ______ mediates the orderly duplication and seperation of chromosomes
cell cycle
during the __ phase (interphase) of the cell cycle, chromosomes are replicated
S
most compacted structure of chromosomes is the ______ ______
mitotic chromosome
Where are rRNA genes, that are arranged together located
nucleolus
first level of chromosome packing is in the _____
nucleosome
what assembles to form chromatin fibers
DNA and nucleosomes
DNA wrapped around a protein core of 8 histones is what?
a nucleosome
histone proteins are not highly conserved among eukaryotes, true or false?
false
positively charged proteins that interact with the negatively charged DNA backbone
histones
what is the most condensed form of chromatin
metaphase chromatid
gene expression is regulated by changing the ______ ______ (controlled by ATP)
chromatin structure
histone modification can be modified to regulate gene expression, true or false?
true
highly condensed and transcriptionally silent chromatin
heterochromatin
less condensed and transcriptionally active
euchromatin
barrier sequences in the heterochromatin stop complete silencing of the chromosome by ____ ____
histone modification enzymes
inactivated X chromosome of female is seen as what type of chromatin in the nucleus
heterochromatin
