BIOL 4320 TTU Exam 1 Questions &
Answers (Grade A+)
What is the common tautomer for cytosine? -
correct answer ✅Amino
What is the common tautomer for guanine? -
correct answer ✅Keto
What facilitates/prohibits base pairing? -
correct answer ✅Orientation of H donors and acceptors
What do methyltransferases do? -
correct answer ✅Base flipping
What is the conformation of right-handed helix purines? -
correct answer ✅Purines in anti conformation with respect to
glycosyl bond
What is the primary conformation of RNA-RNA interactions? -
correct answer ✅A-form
What is the classical Watson-Crick conformation? -
correct answer ✅B form
,BIOL 4320 TTU Exam 1 Questions &
Answers (Grade A+)
What is the conformation of RNA-DNA hybrids? -
correct answer ✅A form
What is the most common form of DNA in cells? -
correct answer ✅B form
What causes S form DNA? -
correct answer ✅Slipped-strand mispairing
Where do slipped-strand mispairings occur? -
correct answer ✅Regions with many repeats
Where does Z DNA form? -
correct answer ✅Regions where there is high salt concentration
and GC rich DNA
What is the importance of Z DNA? Regulates transcription and
causes genetic instability -
correct answer ✅
, BIOL 4320 TTU Exam 1 Questions &
Answers (Grade A+)
What is the difference between positive and negative supercoiling?
-
correct answer ✅More base pairs per turn in negative
supercoiling, less base pairs per turn in positive supercoiling
How can you lower the stability of dsDNA? -
correct answer ✅heat, increasing basicity, decreasing salt
concentration, increasing pH
What is a heteroduplex region? -
correct answer ✅Region where there isn't complete
complementary binding
What do type 4 topoisomerases do? -
correct answer ✅decatenation
When do heteroduplex regions occur? -
correct answer ✅genetic recombination
How to lower Tm? -
correct answer ✅heteroduplex regions, add urea, add methanol
Answers (Grade A+)
What is the common tautomer for cytosine? -
correct answer ✅Amino
What is the common tautomer for guanine? -
correct answer ✅Keto
What facilitates/prohibits base pairing? -
correct answer ✅Orientation of H donors and acceptors
What do methyltransferases do? -
correct answer ✅Base flipping
What is the conformation of right-handed helix purines? -
correct answer ✅Purines in anti conformation with respect to
glycosyl bond
What is the primary conformation of RNA-RNA interactions? -
correct answer ✅A-form
What is the classical Watson-Crick conformation? -
correct answer ✅B form
,BIOL 4320 TTU Exam 1 Questions &
Answers (Grade A+)
What is the conformation of RNA-DNA hybrids? -
correct answer ✅A form
What is the most common form of DNA in cells? -
correct answer ✅B form
What causes S form DNA? -
correct answer ✅Slipped-strand mispairing
Where do slipped-strand mispairings occur? -
correct answer ✅Regions with many repeats
Where does Z DNA form? -
correct answer ✅Regions where there is high salt concentration
and GC rich DNA
What is the importance of Z DNA? Regulates transcription and
causes genetic instability -
correct answer ✅
, BIOL 4320 TTU Exam 1 Questions &
Answers (Grade A+)
What is the difference between positive and negative supercoiling?
-
correct answer ✅More base pairs per turn in negative
supercoiling, less base pairs per turn in positive supercoiling
How can you lower the stability of dsDNA? -
correct answer ✅heat, increasing basicity, decreasing salt
concentration, increasing pH
What is a heteroduplex region? -
correct answer ✅Region where there isn't complete
complementary binding
What do type 4 topoisomerases do? -
correct answer ✅decatenation
When do heteroduplex regions occur? -
correct answer ✅genetic recombination
How to lower Tm? -
correct answer ✅heteroduplex regions, add urea, add methanol
