BIO

what three parts does the nucleotide contain

what three parts does the nucleotide contain

deoxyribose, phosphate, nitrogen base

helicase

unwinds and unzips two strands of DNA

DNA polymerase

adds DNA nucleotides

RNA primase

lays primer for DNA replication

ligase

glues okazaki fragments together

RNA polymerase

adds RNA nucleotides

mRNA

carries gene message from DNA to ribosome

rRNA

assists at the ribosome

tRNA

transfer/carries a specific amino acid to a ribosome

G1

where cell spends most of its life conducting regular cell activities like making proteins

S

DNA replication

G2

the last preparation for nuclear division; replication of mitochondria and centrioles

prophase

nuclear membrane dissolves, spindle fibers appear, chromatin (DNA) condenses into sister chromatid form (chromosomes)

metaphase

spindle fibers align sister chromatids on the equator

anaphase

sister chromatids are pulled apart at their centromeres and drawn by spindle fibers to the poles

telophase

opposite of prophase; chromosomes unwind into chromatin, spindle fivers disappear, nuclear envelope reappears

Cytokinesis

cytoplasm divides; cleavage furrow for animals cells; cell plate/vesicles for plant cell