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BCH3025 Exam 2 Lollylolly with questions and answers (download to pass).
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BCH3025 Exam 2 Lollylolly with questions and answers (download to pass).
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BCH3025 Exam 2 Lollylollywith questions and answers
(download to pass)
The compound that consists of ribose linked by an N-glycosidic bond to N-
9 of adenine is:
A) a deoxyribonucleoside.
B) a purine nucleotide.
C) a pyrimidine nucleotide.
D) adenosine monophosphate.
E) adenosine. - answer E
A major component of RNA but not of DNA is:
A) adenine.
B) cytosine.
C) guanine.
D) thymine.
E) uracil. - answer E
The difference between a ribonucleotide and a deoxyribonucleotide is:
A) a deoxyribonucleotide has an —H instead of an —OH at C-2.
B) a deoxyribonucleotide has configuration; ribonucleotide has the
configuration at C-1.
C) a ribonucleotide has an extra —OH at C-4.
D) a ribonucleotide has more structural flexibility than
deoxyribonucleotide.
,E) a ribonucleotide is a pyranose, deoxyribonucleotide is a furanose. -
answer A
Which one of the following is true of the pentoses found in nucleic acids?
A) C-5 and C-1 of the pentose are joined to phosphate groups.
B) C-5 of the pentose is joined to a nitrogenous base, and C-1 to a
phosphate group.
C) The bond that joins nitrogenous bases to pentoses is an O-glycosidic
bond.
D) The pentoses are always in the -furanose forms.
E) The straight-chain and ring forms undergo constant interconversion. -
answer D
The phosphodiester bonds that link adjacent nucleotides in both RNA and
DNA:
A) always link A with T and G with C.
B) are susceptible to alkaline hydrolysis.
C) are uncharged at neutral pH.
D) form between the planar rings of adjacent bases.
E) join the 3' hydroxyl of one nucleotide to the 5' hydroxyl of the next. -
answer E
The phosphodiester bond that joins adjacent nucleotides in DNA:
A) associates ionically with metal ions, polyamines, and proteins.
B) is positively charged.
C) is susceptible to alkaline hydrolysis.
D) Links C-2 of one base to C-3 of the next.
E) links C-3 of deoxyribose to N-1 of thymine or cytosine. - answer A
,The alkaline hydrolysis of RNA does not produce:
A) 2'- AMP.
B) 2',3'-cGMP.
C) 2'-CMP.
D) 3',5'-cAMP.
E) 3'-UMP. - answer D
The DNA oligonucleotide abbreviated pATCGAC:
A) has 7 phosphate groups.
B) has a hydroxyl at its 3' end.
C) has a phosphate on its 3' end.
D) has an A at its 3' end.
E) violates Chargaff's rules. - answer B
For the oligoribonucleotide pACGUAC:
A) the nucleotide at the 3' end has a phosphate at its 3' hydroxyl.
B) the nucleotide at the 3' end is a purine.
C) the nucleotide at the 5' end has a 5' hydroxyl.
D) the nucleotide at the 5' end has a phosphate on its 5' hydroxyl.
E) the nucleotide at the 5' end is a pyrimidine. - answer D
The nucleic acid bases:
A) absorb ultraviolet light maximally at 280 nm.
B) are all about the same size.
C) are relatively hydrophilic.
D) are roughly planar.
, E) can all stably base-pair with one another. - answer D
Which of the following statements concerning the tautomeric forms of
bases such as uracil is correct?
A) The all-lactim form contains a ketone group.
B) The lactam form contains an alcohol group.
C) The lactam form predominates at neutral pH.
D) They are geometric isomers.
E) They are stereoisomers. - answer C
In a double-stranded nucleic acid, cytosine typically base-pairs with:
A) adenosine.
B) guanine.
C) inosine.
D) thymine.
E) uracil. - answer B
In the Watson-Crick model for the DNA double helix (B form) the A-T and G-
C base pairs share which one of the following properties?
A) The distance between the two glycosidic (base-sugar) bonds is the
same in both base pairs, within a few tenths of an angstrom.
B) The molecular weights of the two base pairs are identical.
C) The number of hydrogen bonds formed between the two bases of the
base pair is the same.
D) The plane of neither base pair is perpendicular to the axis of the helix.
E) The proton-binding groups in both base pairs are in their charged or
ionized form. - answer A
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