Topic 2 - Structure and Replication of DNA Flashcards Preview

Higher Human Biology Unit 1 > Topic 2 - Structure and Replication of DNA > Flashcards

Flashcards in Topic 2 - Structure and Replication of DNA Deck (16):
1

What makes up a DNA strand?

Nucleotides

2

Structure of a nucleotide in DNA

Deoxyribose sugar, phosphate and sugar

3

Structure of a DNA strand

Sugar Phosphate Backbone with complementary base pairing

4

Bases and who they're paired with in DNA

Adenine and Thymine, Cytosine and Guanine

5

What bond holds the DNA strands together

Hydrogen Bonds

6

Is the DNA strand parallel or antiparallel?

Antiparallel

7

How would you describe the antiparallel structure of the strands?

Deoxyribose and Phosphate at a 3' end and a 5' end at each strand

8

What does DNA store for the person and where is it stored?

Genetic Information and in the base sequence of DNA

9

The genotype

Determined by the sequence of DNA bases

10

What is the structure of Chromosomes?

Tightly coiled DNA and are packaged with associated proteins

11

What is required to start DNA Replication?

DNA Polymerase and a primer

12

What is the first stage of DNA Replication?

The DNA is unwound and unzipped to form two template strands

13

What end does the complementary DNA nucleotides get added to on the DNA Strand?

The 3' end

14

What happens to the 5' end during DNA Replication?

The strand is copied in fragments and joined together in fragments

15

DNA Polymerase

This catalyses the formation of the sugar phosphate backbone in the daughter strand

16

What joins the fragments together in DNA Replication?

Ligase