What scientist were credited for their double-helix model for the structure of DNA, and that DNA was the substance of inheritance? - ANSWERSWatson and Crick
Adenine and Guanine are - ANSWERSpurines
Thymine cytosine and uracil are - ANSWERSpyrimidines
Adenine pairs to ________ in DNA - ANSW...
Biology 1305 Final Question & Answers
What scientist were credited for their double-helix model for the structure of DNA, and
that DNA was the substance of inheritance? - ANSWERSWatson and Crick
Adenine and Guanine are - ANSWERSpurines
Thymine cytosine and uracil are - ANSWERSpyrimidines
Adenine pairs to ________ in DNA - ANSWERSThymine
Adenine pairs to ________ in RNA - ANSWERSUracil
Guanine pairs to ________. - ANSWERSCytosine
Chargaff's rule states - ANSWERSin any organism the amount of A = G, and the
amount of G = C
DNA replication is described as semiconservative. Describe a semiconservative model
of DNA replication - ANSWERSwhen a double helix replicates, each daughter molecule
will have one old strand and one new strand
Compare the three models of DNA replication - ANSWERSConservative--two parental
strands come back together after acting as templates for new strands
Semiconservative--two parental stands separate after acting as templates for new
complimentary strands
Dispersive--each strand of both daughter molecules contains a mixture of old and newly
synthesized DNA
Two strands of DNA are _____________. - ANSWERScomplementary
Know these experiments - ANSWERSFrederick Griffith's Rat Experiment with
Streptococcus
Hershey and Chase phage experiment with E. Coli
Matthew Meselson and Franklin Stahl replication model experiment
Replication begins at special sites called ________________. - ANSWERSorigin of
replication
Differentiate between replication in eukaryotic and prokaryotic organisms. Why are they
different? - ANSWERS--prokaryotic has one origin of replication
--eukaryotic has many origins
, --because in a eukaryotic individual, more origins are needed to speed up the process
because they have more DNA to be replicated
What is a replication fork? - ANSWERSthe y-shaped region where new DNA strands
are elongating
What is/are the function(s) of helicase? - ANSWERSto untwist the double helix at the
replication forks
___________ binds to and stabilizes single-stranded DNA until it an be used as a
template. - ANSWERSsingle-strand binding protein
___________ corrects "overwinding" ahead of the replication forks by breaking,
swiveling, and rejoining DNA strands. - ANSWERSTopoisomerase
___________ cannot initiate synthesis of a polynucleotide; they can only add
nucleotides to the 3' end - ANSWERSDNA polymerases
If you have 40% thymine, what percentage of G, C, and A do you have. - ANSWERSA-
40%
C-10%
G-10%
Loosely condensed chromatin is called ___________. - ANSWERSeuchromatin
What phase of the cell cycle is euchromatin found in? - ANSWERSInterphase
Heterochromatin is ____________ found in the ____________ phase of a cell's cycle. -
ANSWERShighly condensed; mitosis
________ is a complex of DNA and proteins found in the nucleus of prokaryotic cells. -
ANSWERSchromatin
What is a histone? - ANSWERSa protein responsible for the first level of DNA packing
in chromatin
An enzyme called _________ catalyzes the lengthening of telomeres in germ cells. -
ANSWERStelomerase
In nucleotide excision repair, _______ cuts out damaged parts of DNA. -
ANSWERSnuclease
_______ removes RNA nucleotides of primer from 5' end and replaces them with DNA
nucleotides. - ANSWERSDNA polymerase I
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