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What stores information in a cell?
DNA
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What do bacteriophages infect?
bacteria.
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Because of base pairing in DNA, the percentage of
thymine molecules in DNA is about equal to the percentage
of
adenine molecules
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___________ 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
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The diagram is of a a DNA molecule
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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
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Which of the following forms a base pair with guanine?
cytosine
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deoxyribose + phosphate group + cytosine is a _____________
found in DNA
nucleotide
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In eukaryotes, DNA is located in the
nucleus.
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During DNA replication, a DNA strand that has the bases AGCTTG produces a strand
with the bases
TCGAAC
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Which part of the bacteriophage contains genetic material
B
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What happens when a piece of DNA is missing?
Genetic information is lost.
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True or Falsethe 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
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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.
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The molecules represented by the spheres are
DNA polymerase
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Watson and Crick discovered that _______ bonds hold base pairs together at the center of a
strand of DNA.
hydrogen
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Which scientist made x-ray diffraction photos of DNA?
Franklin
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Which scientist(s) figured out that the shape of a DNA
molecule is a double helix?
Watson and Crick
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The replication of a DNA molecule results in _____ copies of the same gene.
two
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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
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DNA is tightly wrapped around ____________.
histones
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The Watson and Crick model of DNA is a(an)
____________________, in which two strands are wound
around each other.
double helix
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Griffith called the process he observed transformation
because the harmless bacteria had been
transformed.
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The tips of chromosomes are known as
___________________.
telomeres
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In both prokaryotes and eukaryotes, how many copies
of the chromosome are left after replication?
2
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_________________ are weak bonds that hold the two strands
of DNA together, but also allow the DNA to separate and
replicate.
Hydrogen bonds
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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
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True or FalseIn both prokaryotes and
eukaryotes, DNA replication happens before cell division.
True
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What do the A, T, G and C stand for?
adenine, thymine, guanine, and cytosine