Questions and answers

Why is thymine used in DNA instead of uracil quizlet?

Why is thymine used in DNA instead of uracil quizlet?

Spontaneous mutation of nucleotides – why doesn’t DNA use Uracil as a base? mostly due to the deamination of cytosine to uracil via hydrolysis-which releases ammonia. When thymine is used the cell can easily recognize that the uracil doesn’t belong there and can repair it by substituting it by a cytosine again.

What is the difference between uracil and thymine?

What is the difference between Thymine and Uracil? DNA molecules contain thymine, whereas RNA contain uracil. Thymine contains a methyl (CH3) group at number-5 carbon, whereas uracil contains hydrogen (H) molecule at number-5 carbon. In all biological systems, thymine is mainly synthesized from uracil.

Why is uracil only in RNA and thymine only in DNA quizlet?

Terms in this set (17) Why does RNA contain uracil and DNA contain thymine? Spontaneous cytosine deamination generates uracil, which base pairs with adenine during replication and thereby converts a CG to a TA base pair. RNA is typically more susceptible to a backbone hydrolysis than DNA because of a chemical property.

Why is uracil excluded from DNA but not RNA?

Why might uracil be excluded from DNA but NOT RNA? A. Uracil is much more difficult to synthesize than thymine. Uracil binds adenine too strongly for replication.

How does thymine in DNA differ from uracil in RNA compare and contrast the two nitrogenous bases?

DNA contains the sugar deoxyribose, while RNA contains the sugar ribose. DNA and RNA base pairing is slightly different since DNA uses the bases adenine, thymine, cytosine, and guanine; RNA uses adenine, uracil, cytosine, and guanine. Uracil differs from thymine in that it lacks a methyl group on its ring.

Why is DNA less stable than RNA?

While DNA contains deoxyribose, RNA contains ribose, characterised by the presence of the 2′-hydroxyl group on the pentose ring (Figure 5). This hydroxyl group make RNA less stable than DNA because it is more susceptible to hydrolysis.

Why is RNA less stable than DNA when most Phosphoesters are stable in water for millions of years?

Why is RNA less stable than DNA when most phosphoesters are stable in water for millions of years? You Answered RNA contains uracil. Ribose lacks a 2′ hydroxyl group. H2O (liquid) is in constant thermal motion.

What is the main structural difference between uracil and thymine chegg?

The only difference between thymine and uracil is a methyl group – thymine has it, uracil doesn’t.

Which structural feature is shared by both uracil and thymine?

two keto groups
Accepted Answers: Which structural feature is shared by both uracil and thymine? Both contain two keto groups.

Why does DNA contain thymine but RNA contains uracil?

The first three are the same as those found in DNA, but in RNA thymine is replaced by uracil as the base complementary to adenine. In DNA, however, uracil is readily produced by chemical degradation of cytosine, so having thymine as the normal base makes detection and repair of such incipient mutations more efficient.

Why is DNA more resistant to hydrolysis than RNA?

DNA is more resistant to hydrolysis than RNA. The presence of a 2′-hydroxyl group in RNA is responsible for its greater susceptibility to hydrolysis. The 2′-OH can attack the 3′-phosphate, leading to hydrolytic cleavage of the phosphodiester bond.

Why is thymine used instead of uracil in DNA?

DNA uses thymine instead of uracil because thymine has greater resistance to photochemical mutation, making the genetic message more stable. This is necessary for holding all of the information needed for life to function.

Why does uracil not exist in the DNA?

Because carbon sources and energy are required to methylate a molecule, there must be a reason for DNA developing with a base that does the same thing as uracil but that requires more energy to produce. The answer is that thymine helps guarantee replication fidelity.

How does cytosine de-amination lead to generation of uracil?

Cytosine de-amination leads to generation of uracil… and if DNA already had uracil in place of thymine, then how mutation detection processes would differentiate which one uracil is of the DNA or which one is because of the result of deamination process…

Which is associated with the occurrence of thymine?

You put a question, in solution of which we are interested very much. In DNA molecules, the occurrence of thymine is associated with the occurrence of desoxy-D-ribose. In RNA, the occurrence of uracil is associated with the occurrence of D-ribose.