chapter 10pt2(2)

chapter 10pt2(2) - Chapter 10 DNA replication transcription...

Info iconThis preview shows pages 1–15. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 10 DNA replication, transcription and translation
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
DNA DNA Ultimately the genetic source of diversity is deoxyribonucleic acid. The primary function of DNA in organisms is to store and transmit the genetic information that tells cells which proteins to make and when to make them. Proteins in turn form the structural units of cells and help control chemical processes within cells.
Background image of page 2
Structure of DNA Structure of DNA DNA is an organic compound made up of 2 long chains of nucleotides DNA is made up of 1. sugar molecule – deoxyribose 2. phosphate group – consists of phosphorus atom surrounded by oxygen atoms. 3. nitrogen-containing base
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Structure of DNA – Nitrogen Bases Structure of DNA – Nitrogen Bases The four nitrogen-containing bases found in DNA nucleotides are: Adenine Guanine Cytosine Thymine A G C T
Background image of page 4
Structure of DNA Structure of DNA Individual nucleotides are connected by covalent bonds between the deoxyribose sugar and the phosphate molecules The alternating deoxyribose sugar and phosphate molecules form a “backbone to which the nitrogen-containing bases attach.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Structure of DNA Structure of DNA By facing toward the center, the bases on one chain of DNA face the bases of the other chain of DNA Form hydrogen bonds .
Background image of page 6
Structure of DNA Structure of DNA
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Complementary Base Pairing Complementary Base Pairing Cytosine pairs with Guanine C-G Adenine pairs with Thymine A-T These pairs are known as complementary base pairs .
Background image of page 8
How DNA replicates How DNA replicates DNA Replication is the process by which DNA is copied in a cell before a cell divides by mitosis, meiosis or binary fission. The 2 nucleotide chains separate by unwinding , and each chain serves as a template for a new nucleotide chain. Replication fork is the point at which the 2 chains separate
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Replication of DNA Replication of DNA Because the two strands of DNA are complimentary, each serve as a template to make a NEW COMPLIMENTARY STRAND After replication, the 2 identical double- stranded DNA molecules separate & move to new cells formed during cell division.
Background image of page 10
DNA DNA Replication Replication new new old old Each parent strand Each parent strand remains intact remains intact Every DNA Every DNA molecule is half molecule is half old old ” and half ” and half new new
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Replication of DNA Replication of DNA The chains are separated by enzymes called helicases DNA polymerases are enzymes that bind to the separated chains of DNA As DNA polymerases move along the separated chains, new chains of DNA are assembled using nucleotides in the surrounding medium that are complementary to the existing DNA chains
Background image of page 12
STEPS OF DNA REPLICATION STEPS OF DNA REPLICATION Step 1 Helicases: Enzymes that separate the DNA strands Helicase move along the strands and breaks the hydrogen bonds between the complimentary nitrogen bases Replication Fork: the Y shaped region that results from the separation of the strands
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
STEPS.
Background image of page 14
Image of page 15
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 63

chapter 10pt2(2) - Chapter 10 DNA replication transcription...

This preview shows document pages 1 - 15. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online