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30 Cards in this Set

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These nitrogeous bases are composed of two fused heterocyclic rings
purines
Thymine and uracil are these
pyrimidines
this term refers to a nitrogenous base with a sugar attached
nucleoside
nirogenous bases are attached to this numbered carbon in the sugar
1'
if the percentage of adenine in a bacteria genome is 20% then the percentage of cytosine is this
30%
converts a double-standed DNA region into two single-stranded
regions
helicase
synthesized a short RNAsegement, required for DNA synthesis
primase
this DNA polymerase is involved in DNA repair and not replication
DNA polumerase II
removes the RNA segements and replaces them with DNA
DNA polymerase I
The sequence that RNA polymerace
binds to initiate transcription
promoter
this polymerase transcribe 5S rRNA in eukaryotes
RNA polymerase III
this is the number of Archael RNA polymerases
1
The number if different in the E.coli RNA polymerase
4
if the mRNA transcript reads UAC, then the corresponding sequence on the DNA non-template strand would read this
TAC
the most used start codon is this
AUG
This is the number of sense condons
61
stop codons include UAG, UAA and this
UGA
exceptions to the universality of the genetic code exist in this bacterium
mycoplasma
if the codon consisted of four NOT three bases, the number of possible codons would be
256
the O in lacO stands for this
operator
the gene lacZ encodes this enzyme
beta-galactosidase
the enzyme beta-galactoside permease is encoded by this gene
lay Y
when this binds to the operator, transcrition of the lac operon genes is turned off
repressor
the inducer of the lac operon is this
allolactose
the specific allelic composition of an organism is termed this
genotype
this is the number of asymmetrical grooves formed outside of the DNA double helix
2
this is a structure composed of two or more ribosomes associated with a single mRNA molecule
polysome
the lenght of the nucleotide sequence between a start and stop codon is termed this
open reading frame
A gene that is expressed continuosly by the cell is termed this
constitutive
The name of this class
microbiology