USLO 5.1 Identify the steps in DNA replication

DNA replication

DNA replication

the biological process of producing two identical replicas of DNA from one original molecule;

DNA

"carrier molecule" of all hereditary information; made up of the nucleotide monomers adenine (A), guanine (G), cytosine (C), and thymine (T); the genetic material passed from parent to offspring; the molecule that directs and regulates the construction of proteins via genes

DNA Polymerase

Enzyme that makes DNA from a DNA template; it reads the DNA strand and adds complementary nucleotides to the growing DNA strand

Semiconservative Replication

Each original DNA strand is a template from which a new complimentary strand is generated. Each new strand is actually made of one "old" original strand and one "new" strand. [so that the old original strand is partly or semi-conserved in the new strands]

Helicase

Separates DNA strands by breaking the hydrogen bonds between nitrogenase bases/complementary base pairs; the "unzipper" of DNA for replication; allows stabilizing proteins and other enzymes to gain access to the DNA

Nucleotides

Monomer building blocks of DNA - Adenine (A), Guanine (G), Thymine (T), and Cytosine (C)

Gyrase (DNA gyrase)

Enzyme used to relax the supercoiled genome in preparation for DNA replication; relieves the strain on the DNA strand

The Central Dogma of Life

the "central way of thinking about" how genetic information flows from DNA to RNA to protein; the process that is followed by all cells to generate protein

RNA

Made up of the nucleotide monomers adenine (A), guanine (G), cytosine (C), and uracil (U); generated through the process of transcription in which DNA is used as a template to create it

Gene

Composed of DNA and transcribed into mRNA and finally into a functional protein

Protein

Created through the process of translation, where the mRNA molecule is read within ribosomes and amino acids are placed in accordance with the mRNA sequence

Where DNA is located in eukaryotic cells

within the nucleus

How DNA is organized in eukaryotes

in multiple linear chromosomes

Where DNA is located in prokaryotes

not contained within a nucleus [with the nucleoid region of the cytoplasm]

How DNA is organized in prokaryotes

in a single circular chromosome

Prokaryotic vs. eukaryotic chromosome structure illustration

What base does the T base bind to?

A

What base does the A base bind to in DNA?

T

What base does the A base bind to in RNA?

U

What base does the C base bind to?

G

What base does the G base bind to?

C

Ligase

enzyme that glues the DNA fragment strands together, especially the fragments made during lagging strand synthesis

Leading strand synthesis

continuous (in one piece)

Lagging strand synthesis

in pieces or fragments (discontinuous)

Semi-conservative replication illustration

DNA replication illustration