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 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

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 FalseIn 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