How can we help?
You can also find more resources in our
Select a category
Something is confusing
Something is broken
I have a suggestion
What is your email?
What is 1 + 3?
Biology Chapter 12
What is DNA made of?
5 carbon sugar called dioxyribose, phosphate group, and a nitrogen base.
What is nucleotides made of?
Four kind of bases in DNA
Adenine guanine cytosine thymine
Sugar and phospate groups of each nucleotide
What is the backbone of DNA formed by?
What order can nucleotides be in?
used X-Ray diffraction to get info about the structure of Dna
she aimed an X-ray beam at concentrated DNA
Recorded the scattering pattern of x-rays on film
What did RF do to get info about DNA?
James Watson and Francis Crick
Who built a model that explained how DNA carried information and could be copied using RF's clues from her pattern.
Can only form between base pairs
What did Watson and discover about hydrogen bonds?
What is the A-T G-C Chargraph
half base pairing
Each strand of DNA double helix has all the info needed to reconstruct the other ____ by the process of _______
In eukaryotic chromosomes DNA replication occurs at hundreds of places in _______until each chromosome is copied.
The sites where replication and separation occur are called enzymes control thisb
When the DNA strand unwinds what happens to the hydrogen bonds?
Principle enzyme in DNA replication
DNA polymerase joins individual what according to the base pairing rules to produce a DNA molecule
An enzyme then _____ each DNA strand
uses genes in the cell as code to make proteins for body.
DNA is assited by RNA in the making of ______
the sugar in RNA ribose instead of deoxyribose
RNA is single stranded
RNA contains Uracil instead of Thymine
Can move around the cell
4 different structures in RNA
Carries the coded message from the DNA to the rest of the
makes up ribosomes (us)
Transfers amino acids to the ribosomes
ase means what?
DNA and DNA strand
RNA polymerase binds to which two things?
Since there are 4 different base letters and combine in combos of 3 then there are how many possible codons
How many amino acids in a Genetic Code
There fore some amino acids are coded by what codon
What is always the start condon?
Changes in the genetic material
Involves changes in 1 or few nucleotides, occur at a single point in the DNA sequenc
Usually in form of a substitution.
frame shift mutation
Insertion or deletion of a nucleotide, causes the entire chain to shift since the bases are read in sets of three.
involves in the change and number of the entire chromosome
4 Deletion, duplication, translocation inversion
how many types of chromosomal mutations name them
most mutations are _____they happen all the time no big impact
Mutations are the source of what and can cause beneficial changes