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WorksheetsDNA Structure and Replication
Total questions: 20
Worksheet time: 1hrs 4mins
This scientist used heat and found it denatures proteins while DNA is heat stable. (mice experiment)
Chargaff
Griffith
Watson & Crick
Hershey & Chase
What is DNA made up of?
nucleotides
cytoplasm
RNA
cells
What makes up the SIDES of a DNA ladder? (backbone)
nitrogen bases
Deoxyribose sugars & phosphates
genes & chromosomes
RNA
What makes up the rungs (center) of a DNA ladder?
sugars & phosphates
nitrogen bases
sugars
genes & chromosomes
Studied bacteriophages - phages are composed of protein and DNA. Determined DNA enters the host cell based upon tracers.
Chargaff
Hershey & Chase
Watson & Crick
Avery, McCarty and Macleod
DNA is located in the _____ in eukaryotic cells.
nucleus
cytoplasm
mitochondria
ribosome
Eukaryotic cells (plants & animals) have
one origin of replication site
have many origin of replication sites
According to the Base pair rule, if a DNA molecule contains 1500 adenines how many thymine's will it contain?
1500
500
0
1000
DNA Replication is considered "semi-conservative" because
both original DNA strands are a part of one new DNA strand
one strand of original DNA is on the new DNA strand
Step 2 of Replication: Primase...
unzips DNA
lays down primer; tells polymerase where to start adding nucleotides
adds nucleotides
glues okazaki fragments
Problems with replication
Error rate is 1 in 10 billion; cannot complete ends of DNA - so gets shorter each replication
DNA gets longer with each replication
the ends of DNA are able to be copied
Nitrogen bases are held by what type of bonds?
Covalent Bonds
Hydrogen Bonds
What is the first step in the process of DNA replication?
Helicase enzymes "unzip" the DNA molecule by breaking the hydrogen bonds
free nucleotides are added to the 2 original strands of DNA
2 identical DNA molecules are produced
1 cell divides into 2 cells
What are nucleotides composed (made) of?
Sugar, Phosphate, Nitrogen Base
Phosphate, Adenine, Nitrogen Base
Thymine, Adenine, Cytomine
Phosphate, Nitrogen, Adenine
Prokaryotic cells (bacteria) has
one origin of replication site
many origin of replication sites
In DNA. what base always pairs with A?
A
T
C
G
According to the Base pair rule, if a DNA molecule contains 2 cytosine's how many guanines will it contain?
1500
2
0
1000
