BIOC 384 - MODULE 2 RLM QUIZZES &
SOLUTIONS
Adenine is a ___ whereas adenosine is a ___. Uracil is only found ___ whereas ___ is
only found in DNA. The difference between a nucleoside and a nucleotide is the
presence one or more ___ atoms. - ANSWERbase; nucleoside; RNA; thymine;
phosphate
Select the two pieces of evidence indicating that base stacking contributes more to DNA
helix stability than does base pairing through hydrogen bonds.
Increased temperature disrupts hydrogen bonds but does not disrupt base stacking
Base stacking energies are distinctly different between G:C/C:G and C:G/C:G base
pairs
Even though the number of hydrogen bonds formed between bases in the double helix
is the same as the number of hydrogen bonds formed between bases and water,
neither the double helix nor the single-strand conformation is favored.
Base stacking energies are identical between G:C/C:G and C:G/C:G base pairs
Base stacking energies are distinctly different between G:T/C:G and T:G/C:G base pairs
Even though the number of hydrogen bonds formed between bases in the double helix
is the same as the number of hydrogen bonds formed between bases and water, the
double helix is favored. - ANSWERBase stacking energies are distinctly different
between G:C/C:G and C:G/C:G base pairs
Even though the number of hydrogen bonds formed between bases in the double helix
is the same as the number of hydrogen bonds formed between bases and water, the
double helix is favored.
Why is uracil only in RNA and thymine only in DNA?
Uracil can be formed by a cystosine deamination so if uracil were normally in DNA then
both spontaneous cytosine deamination and naturally occurring uracil would be
indistinguishable and GC to A-T mutation build up quickly
Uracil base pair with adenine and that can lead to G-C to A-T mutation so cannot have
both uracil and adenine in DNA because then blank cannot base pair with adenine
Uracil does normally occur in both DNA and RNA and base pairs with adenine or
thymine but enzymes remove uracil all of the time and replace it with thymine
SOLUTIONS
Adenine is a ___ whereas adenosine is a ___. Uracil is only found ___ whereas ___ is
only found in DNA. The difference between a nucleoside and a nucleotide is the
presence one or more ___ atoms. - ANSWERbase; nucleoside; RNA; thymine;
phosphate
Select the two pieces of evidence indicating that base stacking contributes more to DNA
helix stability than does base pairing through hydrogen bonds.
Increased temperature disrupts hydrogen bonds but does not disrupt base stacking
Base stacking energies are distinctly different between G:C/C:G and C:G/C:G base
pairs
Even though the number of hydrogen bonds formed between bases in the double helix
is the same as the number of hydrogen bonds formed between bases and water,
neither the double helix nor the single-strand conformation is favored.
Base stacking energies are identical between G:C/C:G and C:G/C:G base pairs
Base stacking energies are distinctly different between G:T/C:G and T:G/C:G base pairs
Even though the number of hydrogen bonds formed between bases in the double helix
is the same as the number of hydrogen bonds formed between bases and water, the
double helix is favored. - ANSWERBase stacking energies are distinctly different
between G:C/C:G and C:G/C:G base pairs
Even though the number of hydrogen bonds formed between bases in the double helix
is the same as the number of hydrogen bonds formed between bases and water, the
double helix is favored.
Why is uracil only in RNA and thymine only in DNA?
Uracil can be formed by a cystosine deamination so if uracil were normally in DNA then
both spontaneous cytosine deamination and naturally occurring uracil would be
indistinguishable and GC to A-T mutation build up quickly
Uracil base pair with adenine and that can lead to G-C to A-T mutation so cannot have
both uracil and adenine in DNA because then blank cannot base pair with adenine
Uracil does normally occur in both DNA and RNA and base pairs with adenine or
thymine but enzymes remove uracil all of the time and replace it with thymine
