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MMSC 491 Quiz 1-4 with Correct Answer
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MMSC 491 Quiz 1-4 with Correct Answers In a DNA double helix each type of base forms a stable base pair with only one type of base. When bases on an RNA strand are involved in base pairing, which bases can form stable base pairs with more than one type of base? - ANSWER-Guanine and Uracil Rega...

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  • November 25, 2024
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  • 2024/2025
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MMSC 491 Quiz 1-4 with Correct Answers


In a DNA double helix each type of base forms a stable base pair with only

one type of base. When bases on an RNA strand are involved in base

pairing, which bases can form stable base pairs with more than one type of

base? - ANSWER✔✔-Guanine and Uracil


Regarding the structure of bases in nucleic acids, which, if any, of the

following statements is incorrect? - ANSWER✔✔-Purines carry an amino

group, unlike pyrimidines




True facts were:


-Pyrimidines have a single heterocylic ring consisting of four carbon atoms

plus two nitrogen atoms that are linked to the same carbonyl (-C=O) group


-Purines have two heterocyclic rings, each with two nitrogen atoms


-Thymine = 5-methyluracil.




Copyright ©EMILLYCHARLOTE 2025 ACADEMIC YEAR, ALL RIGHTS RESERVED. Page 1/23

,Regarding the sugar residues in nucleic acids, which, if any, of the

following statements is incorrect? - ANSWER✔✔-The internal sugar

residues in a DNA strand normally have free hydroxyl groups, unlike

those in an RNA strand.




Things that were correct:


-The sugar is always based on a heterocyclic ring that consists of one

oxygen atom and four carbon atoms, one of which is connected to a fifth

carbon atom, the 5? carbon atom.


-Bases are covalently linked to the carbon 1? atoms of the sugars.


-Neighboring sugar residues are linked to each other by a phosphodiester

bond that connects the 3? carbon atom on one sugar to the 5? carbon atom

of its neighbor.


Regarding DNA replication, which, if any, of the following statements is

incorrect? - ANSWER✔✔-DNA replication is said to be semi-conservative

because for each DNA helix only one strand serves as a template for new

DNA synthesis.

Copyright ©EMILLYCHARLOTE 2025 ACADEMIC YEAR, ALL RIGHTS RESERVED. Page 2/23

, Correct facts:


-The two DNA strands of the parental DNA helix are unwound using a

DNA helicase.


-The replication fork marks the point at which DNA is actively being

replicated from a single DNA duplex to form new DNA strands.


-The synthesis of new DNA strands always proceeds in the 5? ? 3?

direction.


Regarding DNA replication and DNA synthesis, which, if any, of the

following statements is incorrect? - ANSWER✔✔-A DNA polymerase

always requires a DNA template to synthesize a complementary DNA.




Correct Facts:


-The leading strand is replicated continuously.


-The lagging strand is replicated discontinuously: the new DNA is

synthesized as short pieces of DNA that must be ligated together.


Copyright ©EMILLYCHARLOTE 2025 ACADEMIC YEAR, ALL RIGHTS RESERVED. Page 3/23

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