Exam III-Fill in the blanks Flashcards
The main damage caused by UV exposure is the formation of ________ and the two categories of repair processes that exist are ______ ________ and ________ _________.
dimers
light dependent
light independent
If a purine is substituted for a pyrimidine, a ________ mutation has occurred.
transversion
Gene families are produced by cycles of ________ followed by ________.
duplication
mutation
Due to the degeneracy of the code, tRNAs are grouped into _______ groups that all carry the same amino acid.
isoaccepting
Most eukaryotic genes, at the level of the transcriptional unit, are divided into noncoding ______ sequences and coding ______ sequences.
Introns
Exons
Hydrophobic nutagens that interact physically with DNA molecules are _________ agents and can be particularly harmful because they may cause _________ mutations
Intercalating
Frameshifts
The most common spontaneous cause of mutation is __________.
tautomerization
A unique feature of bacterial genome function is that ______ and _______ can occur simultaneously.
transcription
translation
Termination of transcription can be either _______ ______ or _______ _________.
factor dependent
factor independent
Within a cell there are a maximum of ____ different types of tRNA molecules, but there seems to be only ____ different charging systems.
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