dna
what is a monomer of DNA?
nucleotide
the name of the model which dna replication occurs by
semi-conservative
what is a monomer of RNA?
nucleotide
what is the function of DNA
to control the process of heredity and development
list all three components of nucleotide
nitrogenous base, pentose sugar, phosphate group
the names of scientists who proved the semi-conservative model
Meselson and Stahl
how many RNAs are involved in protein synthesis process?
3
give the names of 3 RNAs that are involved in protein synthesis
messenger RNA, transfer RNA, ribosomal RNA
what is the name of pentose sugar of dna?
deoxyribose
the name of the enzyme which overwinds the DNA
topoisomerase
the name of the nitrogenous base in the rna, that comes instead of thymine
uracil
which rna has anticodon?
tRNA
list all nitrogenous bases of dna
guanine, cytosine, thymine, adenine
what is the purpose of ligase?
to join okazaki fragments together
what is a codon
sequence of 3 bases that codes for 1 amino acid
what is difference between deoxyribose and ribose?
deoxyribose lacks one oxygen
what is the name of bond between 2 nucleotides?
phosphodiester bond
explain why we have both leading and lagging strands?
dna strands are antiparallel and DNA polymerase III adds nucleotides from 3' to 5'
why do we have 20 tRNAs?
according to binding to amino acids (we have 20 amino acids)
give at least 2 reasons why DNA is more stable than RNA
Chemical stability (deoxyribose)
DNA is double-stranded
Thymine instead of Uracil
DNA has smaller grooves