Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
13 Cards in this Set
- Front
- Back
|
Gene
|
A segment of DNA that code for one protein
|
|
|
4 types of nucleotides
|
-pyramidines:cytosine & thimine
-purines: adenine & guanine |
|
|
Structure of DNA
|
-double stranded molecule
-phosphate-sugar groups form uprights of ladder in covalent bonds -nitrogenous bases project inward to form rungs -base pairs held together by hydrogen bonds |
|
|
Adenine will only pair with ____
|
thymine
|
|
|
Guanine will only pair with
____ |
cytosine
|
|
|
helicases
|
-enzymes that cause DNA to unzip
|
|
|
polymerases
|
attached nucleotides to free exposed bases in DNA
-catalyze covalent bonds between incoming nucleotides -catalyze hydrogen bonding between purines and pyramidines |
|
|
semiconservative replication
|
each daughter strand consists of old portion of parent strand and a new portion
|
|
|
Complete set of human DNA in a cell
|
46 chromosomes
6 billion base pairs 3m in length |
|
|
Primase
|
starts chain with RNA primer
|
|
|
DNA ligase
|
-needed on 3' - 5' fragments
-connects small fragments with the new portion already formed |
|
|
Telomeres
|
-Non coding portion of a chromosome
|
|
|
Nucleases
|
-Assist in repair of DNA after synthesis is completed
|
