Upgrade to remove ads
9th Biology DNA Test
Terms in this set (41)
What does DNA stand for?
What is DNA?
The genetic material of the cell
What is the shape of DNA?
A Double Helix
(a twisted ladder connected)
What is the backbone of the DNA ladder?
A Phosphate Group and a 5-Carbon Sugar
What are the rungs of the ladder?
Adenine, Thymine, Guanine, & Cytosine
Which nitrogenous bases are purines?
Which nitrogenous bases are pyrimadines?
What are the 3 parts of DNA?
5 carbon sugar
Adenine pairs with...
Thymine pairs with...
Guanine pairs with....
Cytosine pairs with...
How many rings do purines have?
How many rings do pyrimadines have?
True or False:
A purine always pairs with a pyrimadine
How many hydrogen bonds exist between adenine and thymine?
How many hydrogen bonds exist between cytosine and guanine?
What is Chargaff's Rule? what year was it developed?
%A=%T in DNA
%C=%G in DNA
%A + %T + %C + %G = 100%
What did Mendel discover? When?
He discovered the basics of how traits are passed from parents to offspring
What did Griffith discover? How? When?
He discovered that genetic material can be transferred between cells by injecting S and R bacteria into mice
What did Avery, MacLeod, & McCarty discover? How? When?
They discovered that DNA is the genetic material by removing different parts of the cell
What did Hershey & Chase discover? How? When?
DNA is the genetic material
they infected viruses and used bacteria as a host for reproduction. Used fluorescent tagging
Who discovered the shape of DNA? When?
Who first published the findings on the shape of DNA?
Watson & Crick
When does DNA replicate?
Function of DNA Helicase (5)
-unwinds and unzips DNA
-unzip: break hydorgen bonds
-causes replication bubbles and forks to form
Function of DNA Polymerases
-helps to form new DNA
-starts at fork and moves down
-adds new nucleotides
-"proof reads" for correct pairings
1st step of DNA Replication (3)
-helicase causes the double helix to unwind and unzip
-causes the formation of Y-shaped replication forks
-2 replication forks form a replication bubble
2nd step of DNA Replication
-nucleotides are added at the each fork (DNA Polymerases)
-both original strands act as templates
-2 new double helices are formed
3rd step of DNA Replication
-two new DNA molecules are formed
Similarities between DNA replication in prokaryotic and eukaryotic cells (4)
-identical to original
-involves replication forks and bubbles
-occurs during the synthesis phase
Differences between DNA replication in prokaryotic and eukaryotic cells (
-singular, circular chromosome
-replication starts at one point
-replication occurs in opposite directions
-several, linear chromosome
-replication starts at several sites at the same time
-replication bubbles get larger as more DNA is copied
-bubbles eventually meet, leaving 2 identical DNA molecules
The S bacteria that Griffith worked with was...
harmful & smooth
The R bacteria that Griffith worked with was...
What was the S bacteria's effect on the mice?
It killed the mice
What was the R bacteria's effect on the mice?
It did not kill the mice
What was the effect of the heat-killed S bacteria on the mice?
It did not kill the mice
What was the effect of the heat-killed S bacteria and the R bacteria on the mice? Why?
They killed the mice because the heat-killed S bacteria was able to transfer it's harmful genetic material to the harmless R bacteria
Another word for virus is...
Sulfur is found in....
Phosphorous is found in...
You might also like...
Biology Chapter 12:12.1-12.3
Bio test 3/20
Other sets by this creator
Edexcel Politics AS- The Uk Constitution
UK politics: voting behavior and the media