12.2 The Structure of DNA/ The Components of DNA

DNA contains four kinds of nitrogenous bases: ___, ____, ____, and __.

-adenine -guanine -cytosine -thymine

Nucleotides in DNA are made of three basic components: a sugar called___, a ___, and a ____

-deoxyribose -phosphate group -nitrogenous base

nucleotide

5 carbon, sugar,called deoxribose, a phosphate and 1-4 nitrogen base a,t,g,c

Erwin Chargaff

A=T, G=C percents will always connect

The nucleotides in DNA are joined by ___ bonds.

covalent

James Watson and Francis Crick

double helix pattern of DNA determined from Xray of DNA and other evidence

In DNA, ___ can be joined in any order.

necleotides

The building blocks of DNA are___.

nucleotides

Rosalind Franklin

pattern of DNA: twisted coils (helix) determined by taking X-rays of DNA

phosphate group

phosphate in DNA backbone (P)

teloerase

the tips of the of chromosomes as known as telomeres that hav repeating sequence

double helix

twisted ladder

deoxiribose

Sugar in DNA backbone (S)

DNA polymerase

adds nucleotides to the new strand and proofread the new strand