Which statement is NOT true of all naturally occurring DNA?
A) Deoxyribose units are connected by 3',5'-phosphodiester bonds.
B) The amount of A always equals the amount of T.
C) The ratio A+T/G+C is constant for all-natural DNAs.'
D) The two complementary strands are antiparallel.
E) Two hydrogen bonds form between A and T.
Give this one a try later!
, C) The ratio A+T/G+C is constant for all-natural DNAs.'
One of the MOST common regulatory second messengers in cells is:
A) FAD.
B) NAD+.
C) coenzyme A.
D) ATP.
E) cAMP.'
Give this one a try later!
E) cAMP.'
Which statement is NOT true about base stacking when nucleic acids are in a double-
stranded conformation?
A) Stacking interactions occur when two or more bases are positioned with their rings
parallel to each other.
B) Stacking interactions are hydrophilic in nature.'
C) Stacking involves a combination of van der Waals and dipole-dipole interactions
between bases.
D) Base stacking helps to minimize contact of the bases with water.
E) Base stacking interactions are important in stabilizing the three-dimensional
structure of nucleic acids.
Give this one a try later!
, B) Stacking interactions are hydrophilic in nature.'
42. The "energy carrier" ATP is an example of a(n):
A) deoxyribonucleoside triphosphate.
B) dinucleotide.
C) peptide.
D) ribonucleotide.
E) ribonucleoside triphosphate.'
Give this one a try later!
E) ribonucleoside triphosphate.'
Deoxyribonucleic acid (DNA) is different from ribonucleic acid (RNA) in that
A. DNA contains a 3′ H, whereas RNA contains a 3′ OH.
B. only DNA utilizes the base uracil.
C. only RNA can be hydrolyzed by alkaline conditions & form 2′,3′ cyclic
monophosphate derivatives'
D. only DNA contains a pentose sugar.
Give this one a try later!
C. only RNA can be hydrolyzed by alkaline conditions & form 2′,3′ cyclic
monophosphate derivatives, resulting in hydrolysis of the phosphodiester
bonds that link ribonucleotides in an RNA chain.'
, Write a double-stranded DNA sequence containing a six-nucleotide palindrome.
Give this one a try later!
Any double-stranded sequence that has the form:
1-2-3-4-5-6-6'-5'-4'-3'-2'-1'
1'-2'-3'-4'-5'-6'-6-5-4-3-2-1
where each number and its prime represent correctly paired bases (A with
T, C with G) all along the double-stranded molecule.
Match the type of mutagenesis (permanent) with the role below:
Mutagenesis type
(a) Deamination
(b) Depurination
(c) Oxidative
(d) Chemical
(e) Radiation
Role
___ dimerization of pyrimidines; causes ring opening and strand breaking
___ most susceptible is Mitochondrial DNA; hydroxylation of guanine
___ deoxyribose is present but the base (purine/pyrimidine) is not
___ slow; nucleotide base undergo spontaneous loss of exocyclic amino group
___ alkylating agents can alter certain bases of DNA; methylation of guanine
Give this one a try later!
A) Deoxyribose units are connected by 3',5'-phosphodiester bonds.
B) The amount of A always equals the amount of T.
C) The ratio A+T/G+C is constant for all-natural DNAs.'
D) The two complementary strands are antiparallel.
E) Two hydrogen bonds form between A and T.
Give this one a try later!
, C) The ratio A+T/G+C is constant for all-natural DNAs.'
One of the MOST common regulatory second messengers in cells is:
A) FAD.
B) NAD+.
C) coenzyme A.
D) ATP.
E) cAMP.'
Give this one a try later!
E) cAMP.'
Which statement is NOT true about base stacking when nucleic acids are in a double-
stranded conformation?
A) Stacking interactions occur when two or more bases are positioned with their rings
parallel to each other.
B) Stacking interactions are hydrophilic in nature.'
C) Stacking involves a combination of van der Waals and dipole-dipole interactions
between bases.
D) Base stacking helps to minimize contact of the bases with water.
E) Base stacking interactions are important in stabilizing the three-dimensional
structure of nucleic acids.
Give this one a try later!
, B) Stacking interactions are hydrophilic in nature.'
42. The "energy carrier" ATP is an example of a(n):
A) deoxyribonucleoside triphosphate.
B) dinucleotide.
C) peptide.
D) ribonucleotide.
E) ribonucleoside triphosphate.'
Give this one a try later!
E) ribonucleoside triphosphate.'
Deoxyribonucleic acid (DNA) is different from ribonucleic acid (RNA) in that
A. DNA contains a 3′ H, whereas RNA contains a 3′ OH.
B. only DNA utilizes the base uracil.
C. only RNA can be hydrolyzed by alkaline conditions & form 2′,3′ cyclic
monophosphate derivatives'
D. only DNA contains a pentose sugar.
Give this one a try later!
C. only RNA can be hydrolyzed by alkaline conditions & form 2′,3′ cyclic
monophosphate derivatives, resulting in hydrolysis of the phosphodiester
bonds that link ribonucleotides in an RNA chain.'
, Write a double-stranded DNA sequence containing a six-nucleotide palindrome.
Give this one a try later!
Any double-stranded sequence that has the form:
1-2-3-4-5-6-6'-5'-4'-3'-2'-1'
1'-2'-3'-4'-5'-6'-6-5-4-3-2-1
where each number and its prime represent correctly paired bases (A with
T, C with G) all along the double-stranded molecule.
Match the type of mutagenesis (permanent) with the role below:
Mutagenesis type
(a) Deamination
(b) Depurination
(c) Oxidative
(d) Chemical
(e) Radiation
Role
___ dimerization of pyrimidines; causes ring opening and strand breaking
___ most susceptible is Mitochondrial DNA; hydroxylation of guanine
___ deoxyribose is present but the base (purine/pyrimidine) is not
___ slow; nucleotide base undergo spontaneous loss of exocyclic amino group
___ alkylating agents can alter certain bases of DNA; methylation of guanine
Give this one a try later!
