AP Biology aid » DNA, RNA, and also Proteins » DNA and also RNA structure » knowledge Nucleotides and Base bag
Explanation:

Uracil is tied to adenin in the manufacturing of RNA, if thymine is offered in its place in the manufacturing of DNA. Adenine, guanine, and also cytosine are all used in the production of both RNA and DNA.

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How many complete hydrogen bonds would certainly there be between base pairs of a piece of DNA if the succession of one side was CGTTTGAC?


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*


*


*


*


Explanation:

Cytosine and also guanine form three hydrogen bonds between each other, if tyrosine and also adenine type two hydrogen bonds. We just need to counting how numerous of every base us have and also multiple cytosine and also guanine by three, and thymine and adenine through two.

CGTTTGAC has 2 cytosine, 2 guanine, 3 thymine, and also 1 adenine.

*


Explanation:

DNA and RNA room made that nucleotides, which contain oxygen, hydrogen, nitrogen, carbon, and also phosphorus. The nucleic acid backbone is comprised of sugars, make of carbon, hydrogen, and also oxygen, and phosphate groups, do of phosphorus, hydrogen, and also oxygen. The backbone binds to bases, i m sorry contain a nitrogen element.

Potassium is not found in nucleic acid structure, and also is offered in other parts that the body favor muscles and also nerves for signal propagation.


Explanation:

This inquiry is mostly about the differentiations between a nucleoside and also a nucleotide. A nucleoside is composed of a nitrogenous base and also a ribose or deoxyribose sugar. A nitrogenous base, a ribose/deoxyribose sugar, and also a phosphate describe a nucleotide. Remember that nucleosides space incomplete nucleotides, and also lack a phosphate group.


Which of the following is a reason that cytosine pairs much more favorably through guanine 보다 thymine or adenine?


Explanation:

Cytosine and also guanine, as soon as base paired, have actually three hydrogen bonds between them. Adenine and thymine only have actually two. This extra hydrogen link helps make the cytosine-guanine pair favorable since it rises stability, and reduces bond energy.

Ionic and covalent bonds do not occur between nitrogenous bases in DNA. Covalent bonds are discovered in the DNA backbone (known together phosphodiester bonds).

 


Correct answer:

The ratio of adenin to thymine is close to

*
 and the ratio of guanine to cytosine is nearby to 
*


Explanation:

Due come DNA"s double-helical structure, the nucleotide bases space paired. Adenin is paired v thymine and also guanine is paired with cytosine. Chargaff discovered that there is generally an equivalent variety of adenine and thymine bases, and also an equivalent variety of guanine and also cytosine bases. In a offered sample of DNA, all adenine residues will have actually thymine counterparts on the security strand, and also all cytosine residual water will have actually complementary guanine counterparts. Together a result, there will certainly be equal numbers of every residue the the basic pair in any type of sample the double-stranded DNA.


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Example inquiry #31 : Dna and also Rna structure


Which that the following choices displays security DNA strands?


Possible Answers:

3’-ATTGC-5’

3’-TAACG-5’


3’-ATTGC-5’

5’-ATTGC-3’


3"-ATTGC-5’

5’-TAACG-3’


3’-AUUGC-5’

5’-UAACG-3’


Correct answer:

3"-ATTGC-5’

5’-TAACG-3’


Explanation:

When determining complementary strands, there room a few important points to consider. First, remember the uracil is only discovered in RNA. We can eliminate any type of answer choices that contain uracil. Second, remember that DNA is anti-parallel. This method that the 3" end of the template strand must match up through the 5" finish of the complementary strand. Flip any type of answers that have both 3" ends together. Finally, make sure that the bases align correctly. Adenine and thymine should always pair and also cytosine and also guanine should always pair.

Template strand: 3"-ATTGC-5’

Complementary strand is antiparallel: 5"-_ _ _ _ _-3"

Complementary strand must have right basic pairs: 5"-TAACG-3"

An alternate way of creating this answer would be 3"-GCAAT-5". This answer would certainly still it is in correct! that would simply need to it is in flipped, as in the second step outlined above.


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Example question #32 : Dna and Rna framework


Which that the following could be a segment that DNA?


Possible Answers:

5"-CTAGAG-3"

3"-GATCTC-5"


5"-GTCGAT-3"

3"-GATCTC-5"


5"-CTCGTG-3"

3"-AATGTA-5"


5"-CTCGTG-3"

3"-GATCTC-5"


5"-AGATAG-3"

3"-GATCTC-5"


Correct answer:

5"-CTAGAG-3"

3"-GATCTC-5"


Explanation:

DNA is a double stranded molecule that is antiparallel, meaning the 5" end of one strand matches up through the 3" end of the various other strand. Nitrogenous bases hold the strands together via hydrogen bonding. These bases are adenine (A), thymine (T), guanine (G), and cytosine (C). Adenine (A) deserve to only pair through thymine (T), and guanine (G) can only pair v cytosine (C).

The correct answer presents 2 strands that room antiparallel and also show ideal binding patterns.

5"-CTAGAG-3"

3"-GATCTC-5"

All other answers have an error in base pairing or ordering.


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Example question #33 : Dna and Rna framework


Which the the following describes the contents of a nucleotide? 


Possible Answers:

A phosphate group, a pentose sugar, and also an amino acid 


A phosphate group, a hexose sugar, and a nitrogenous base 


A phosphate group, a pentose sugar, and also a nitrogenous base


ATP, a pentose sugar, and also a nitrogenous base 


ATP, a hexose sugar, and also an amino acid 


Correct answer:

A phosphate group, a pentose sugar, and a nitrogenous base


Explanation:

Nucleic acids are one of the main organic macromolecules, and include DNA and RNA. A nucleotide is a DNA monomer, while a ribonucleotide is one RNA monomer. Plenty of nucleotides room bonded with each other by phosphodiester binding to type a solitary molecule that DNA. The pattern of nucleotides is used to store and transmit hereditary information. A nucleotide is written of a phosphate group, a nitrogenous base, and also a pentose street (deoxyribose).


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Example question #34 : Dna and also Rna structure


Which that the adhering to DNA primers has actually the lowest melting point?


Possible Answers:

AGGTGGACACCG


GCCACAGGTGGA


CATGCGTAGATC


GCGGATGTGTCC


TGACAAACTTGT


Correct answer:

TGACAAACTTGT


Explanation:

Cytosine and also guanine type three hydrogen bonds v each other, when adenine and also tyrosine only type two hydrogen bonds. This way that strands the DNA through a greater percentage of cytosine and guanine will have greater melting points.

Since we are in search of the sequence v the lowest melt point, we want the lowest portion of cytosine and guanine, and the greatest percentage of adenine and thymine.


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