Download Chapter 12 Review PPT

What stores information in a
cell?
DNA
What do bacteriophages
infect?
bacteria.
Because of base pairing in
DNA, the percentage of
thymine molecules in DNA is
about equal to the percentage
of
adenine molecules
___________ experiments
advanced the study of genetics
by proving that there is a
chemical that contains genetic
information that can be passed
from one organism to another.
Griffith’s
The diagram is of a
a DNA molecule
Who purified large amounts of
DNA, stretched the fibers so
the strands were parallel, and
used an X-ray beam to produce
an image of the molecule.
Rosalind Franklin
Which of the following forms
a base pair with guanine?
cytosine
deoxyribose + phosphate group
+ cytosine is a _____________
found in DNA
nucleotide
In eukaryotes, DNA is located
in the
nucleus.
During DNA replication, a
DNA strand that has the bases
AGCTTG produces a strand
with the bases
TCGAAC
Which part of the bacteriophage contains genetic material
B
What happens when a piece of
DNA is missing?
Genetic information is lost.
True or False
the chronological order of the important
discoveries in the structure of DNA is:
Chargaff’s ratios of nucleotides
Franklin makes an X-ray diffraction
photo of DNA  Watson and Crick
identify the double helix
True
Identify the three main
components in the nucleotide
The circles are the phosphate group, the
pentagons are deoxyribose, and the A and T
(adenosine and thymine) are the bases.
The molecules represented by the spheres are
DNA polymerase
Watson and Crick discovered
that _______ bonds hold base
pairs together at the center of a
strand of DNA.
hydrogen
Which scientist made x-ray
diffraction photos of DNA?
Franklin
Which scientist(s) figured out
that the shape of a DNA
molecule is a double helix?
Watson and Crick
The replication of a DNA
molecule results in _____
copies of the same gene.
two
Chargaff contributed to the
understanding of DNA by
figuring out that the
percentages of ______ and
_________were almost equal
in any sample of DNA.
adenine and thymine
DNA is tightly wrapped around
____________.
histones
The Watson and Crick model
of DNA is a(an)
____________________, in
which two strands are wound
around each other.
double helix
Griffith called the process he
observed transformation
because the harmless bacteria
had been
transformed.
The tips of chromosomes are
known as
___________________.
telomeres
In both prokaryotes and
eukaryotes, how many copies
of the chromosome are left
after replication?
2
_________________ are weak
bonds that hold the two strands
of DNA together, but also
allow the DNA to separate and
replicate.
Hydrogen bonds
What enzyme works to add
DNA to ends of chromosomes
in rapidly dividing cells such
as those found in an embryo, to
prevent genes from being lost
during replication?
telomerase
True or False
In both prokaryotes and
eukaryotes, DNA replication
happens before cell division.
True
What do the A, T, G and C
stand for?
adenine, thymine, guanine, and cytosine