Bio Unit 7 Quiz 1

DNA stores genetic info using sequence of _______

nitrogen/nucleotide bases

Nucleotide/nitrogen bases

contain instructions to make organisms proteins

dark pentagon

sugar

clear dotted pentagons (middle)

hydrogen bond

blue dot

phosphate

grayish white lettered pentagon

nucleotide base

When copying DNA, one strand serves as a _____ for the other strand

template

Sugar and phosphate make up the _________ of the DNA molecule

backbone

Nitrogen bases make up the ________

rungs

_________ can only add nucleotides in the _____ prime to _____ prime direction

DNA polymerase, 5 to 3

Semi conservative replication

Base pairing makes strands serve as template for new strand—New strands are half original and half new DNA

Lagging strand

DNA strand built in fragments

Leading strand

strand that is NOT built in fragments

Helicase

unzips by breaking hydrogen bonds

ligase

links together new fragments of DNA in lagging strand

DNA polymerase

adds nucleotides to new strand at 3’ end

upper gray arrow 5’ to 3’

lagging strand

black outer strands

original strands

new lower strand going 5’ to 3’ reversed

leading strand

histone

protein that is used to organize and wrap DNA

What phase of interphase does DNA replication occur in?

S

nucleosome

structure that contains chromatin and histone

chromosome

condensed DNA that contains 100s and 1000s of genes

Two strands of each DNA molecule run _____ to each other

anti parallel

DNA strands are held together by ______

hydrogen bonds