Ch. 5 DNA: Adenine, Guanine, Cytosine, Thymine & Complementary Bases

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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


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