Ch. 5 DNA: Adenine, Guanine, Cytosine, Thymine & Complementary Bases
Base Pairs
hydrogen-bonded nitrogenous bases
For hydrogen bonding to work two DNA strands must run in
opposite directions
C stands for
Cytosine
Pyrimidine bases
Cytosine and Thymine
Nitrogenous bases can be categorized into how many groups?
two
The sugar end of the DNA strand is referred to as the _____ end and the phosphate end is referred to as the _____ end.
3;5
A stands for
Adenine
Which two bases have a double ring base?
Adenine & Guanine
Purine bases
Adenine and Guanine
Which of the following statements is true? 1) Cytosine forms hydrogen bonds with adenine. 2) Adenine forms carbon bonds with thymine. 3) Adenine forms hydrogen bonds with thymine. 4) Cytosine forms carbon bonds with guanine.
Adenine forms hydrogen bonds with thymine.
G stands for
Guanine
Complementary Base Pairing
Hydrogen bonding between particular pyrimidines and purines. Adenine & Thymine. Cytosine & Guanine.
Guanine
The base that pairs with Cytosine in DNA
Cytosine
The base that pairs with Guanine with DNA
Adenine
The base that pairs with Thymine in DNA
Why do DNA strands need to be antiparallel?
The strands need to run in opposite directions for hydrogen bonding to work.
T stands for
Thymine
Which two bases have a single ring base?
Thymine & Cytosine
Strand of DNA
formed by the covalent linkage of nucleotides in a linear manner
How many nitrogenous bases are there?
four
Which of the following bases are categorized as purines?
adenine & guanine
5' end
phosphate group
3' end
sugar
Thymine
the nucleotide that hydrogen bonds with the nucleotide adenine in DNA.
DNA strands are antiparallel meaning what?
they are parallel but are oriented in opposite directions
Cytosine forms ___ hydrogen bonds with Guanine
three
Adenine forms ___ hydrogen bonds with Thymine
two
