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Topics 3.3 & 7.1

DNA Structure

Term or QuestionDefinition or Answer
Outline DNA nucleotide structure phosphate group, deoxyribose sugar, and a nitrogenous base (A, T, C, G)
Sate the four DNA bases Adenine (A), Thymine (T), Guanine (G), Cytosine (C)
Which nitrogenous bases are purines? Adenine (A) and Guanine (G)
Which nitrogenous bases are pyrimidines? Thymine (T) and Cytosine (C)
Which base does Adenine pair with? Thymine
Which base does Thymine pair with? Adenine
Which base does Cytosine pair with? Guanine
Which base does Guanine pair with? Cytosine
How many hydrogen bonds are between C and G? 3
How many hydrogen bonds are between A and T? 2
What are the proteins DNA wrap around? Histones
What is the charge of DNA? What is the charge of histone proteins? DNA is negatively charged and histone proteins are positively charged
What is a nucleosome? DNA wrapped (coiled) twice around a histone protein
What is chromatin? nucleosomes coiled around each other, further condensing the DNA
What do nucleosomes do? supercoil DNA (chromosomes) which helps regulate transcription (mRNA production)
What are exons? part of the genetic code that gets expressed (proteins made from that part of the code) (both start with e)
What are introns? part of the genetic code that does not code for proteins (not used for gene expression)
Which type of cells have DNA that contain exons and introns? Eukaryotic cells
Created by: kelly.norris
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