BIO 201- EXAM 2 QUESTIONS AND ANSWERS (GRADED A+)

BIO 201- EXAM 2 QUESTIONS AND
ANSWERS (GRADED A+)
chromosomes contain - ANSWER-DNA and protein

Cytosine bonds with - ANSWER-Guanine

adenine bonds with - ANSWER-Thymine or Uracil

in RNA which nucleotide is replaced for Uracil - ANSWER-thymine

which base paring is held by three hydrogen bonds - ANSWER-cytosine and
guanine

nucleotides are added to which prime side - ANSWER-3'

dna is polar/nonpolar - ANSWER-polar

on the DNA backbone what is bonded to what, and where - ANSWER-phosphate
group on 5' bonds to the hydroxyl group on the sugar at the 3' end

charge of 3' end - ANSWER-hydroxyl group (-)

charge of 5' end - ANSWER-phosphate group (3-)

Two ring bases - ANSWER-purines A and G

three ring bases - ANSWER-Pyrimidnes U,C and T

long sequence of DNA in a chromosome - ANSWER-chromatin


nucleosomes packed into what - ANSWER-chromatin fiber

chromatin fibers fold into what shape to become__ - ANSWER-loops that condense
into chromosomes

chromatin remodeling complexes - ANSWER-protein machines that use the energy
of ATP hydrolysis to lossen the DNA and push it along the histone octamer

N-terminal tails - ANSWER--N terminal ends of the histones protrude from the core
particle
-form intermolecular contacts with adjacent nucleosomes
-very important in regulation of chromatin structure

what reaction connects DNA nucleotides and bases - ANSWER-condensation
reactions