Explanation:

When identify complementary strands, there space a few important points come consider. First, remember the uracil is only found in RNA. We deserve to eliminate any answer options that contain uracil. Second, remember the DNA is anti-parallel. This way that the 3" finish of the theme strand must match up with the 5" finish of the safety strand. Flip any answers that have actually both 3" ends together. Finally, make sure that the bases align correctly. Adenine and also thymine should constantly pair and cytosine and guanine should constantly pair.

You are watching: If a dna sample contains 13% adenine, what percentage of the sample contains cytosine?

Template strand: 3"-ATTGC-5’

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

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

An alternate way of writing this answer would certainly be 3"-GCAAT-5". This answer would still it is in correct! that would merely need to be flipped, together in the 2nd step outlined above.


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Example question #32 : Dna and also Rna framework


Which of the following might be a segment of DNA?


Possible Answers:

5"-GTCGAT-3"

3"-GATCTC-5"


5"-AGATAG-3"

3"-GATCTC-5"


5"-CTCGTG-3"

3"-AATGTA-5"


5"-CTCGTG-3"

3"-GATCTC-5"


5"-CTAGAG-3"

3"-GATCTC-5"


Correct answer:

5"-CTAGAG-3"

3"-GATCTC-5"


Explanation:

DNA is a dual stranded molecule that is antiparallel, meaning the 5" finish of one strand matches up through the 3" finish of the other strand. Nitrogenous bases organize the strands with each other via hydrogen bonding. These bases space adenine (A), thymine (T), guanine (G), and cytosine (C). Adenin (A) deserve to only pair through thymine (T), and also guanine (G) can only pair through cytosine (C).

The correct answer presents two strands that room antiparallel and also show suitable binding patterns.

5"-CTAGAG-3"

3"-GATCTC-5"

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


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Example question #33 : Dna and also Rna framework


Which of the following defines the contents of a nucleotide? 


Possible Answers:

ATP, a pentose sugar, and a nitrogenous base 


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


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


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


ATP, a hexose sugar, and also an amino acid 


Correct answer:

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


Explanation:

Nucleic mountain 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. Numerous nucleotides room bonded together by phosphodiester bonds to form a solitary molecule that DNA. The sample of nucleotides is used to store and also transmit hereditary information. A nucleotide is created of a phosphate group, a nitrogenous base, and also a pentose sugar (deoxyribose).


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Example concern #31 : Dna and Rna framework


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


Possible Answers:

TGACAAACTTGT


GCGGATGTGTCC


AGGTGGACACCG


CATGCGTAGATC


GCCACAGGTGGA


Correct answer:

TGACAAACTTGT


Explanation:

Cytosine and guanine type three hydrogen bonds v each other, if adenine and also tyrosine only type two hydrogen bonds. This method that strands that DNA with a higher percentage the cytosine and guanine will have higher melting points.

Since we are trying to find the sequence with the lowest melting point, we want the lowest percent of cytosine and also guanine, and also the greatest percentage the adenine and thymine.


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Example inquiry #31 : Dna and Rna structure


A ar of double-stranded DNA is written of 35% adenin bases. What is the percent of cytosine bases in the ar of DNA?


Possible Answers:

*


*



More information is needed in order come answer the question


*


Correct answer:


Explanation:

Since we understand that 35% the the bases in the section of DNA space adenine, we deserve to conclude that 35% that the bases are thymine. This is since adenine will constantly pair v thymine, so there will certainly be simply as countless thymine bases as adenine bases. Together, adenine and thymine compose 70% that the segment.

*

*

This way that 30% the the ar is composed of guanine-cytosine pairs.

*

Since these two bases will certainly be equal in quantity, 15% that the DNA section will be cytosine bases.

*


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Example inquiry #36 : Dna and Rna framework


In a sample of DNA, 30% that the bases are discovered to be guanine. What portion of the bases in the sample are thymine?


Possible Answers:

*


Correct answer:

*


Explanation:

Guanine will pair v cytosine. Native this knowledge, we can assume the there will be one equal number of guanine and also cytosine residual water in the sample. Every guanine must have a cytosine counterpart.

*

The full composition that the DNA sample should be accounted because that by the amount of all the bases.

*

Use the known values for guanine and cytosine to uncover the sum of adenine and also thymine.

*

*

Like cytosine and also guanine, adenine and thymine must be present in equal amounts in stimulate to kind proper basic pairs. We have the right to reasonably assume that fifty percent of the continuing to be DNA will certainly consist of each residue.

*


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Example inquiry #37 : Dna and also Rna framework


An evaluation of a DNA sample shows it consists of 35% adenine. What percent of the sample would certainly be cytosine? 


Possible Answers:
Correct answer:

*


Explanation:

There are 4 nitrogenous bases uncovered in DNA: adenine, thymine, cytosine, and guanine. Adenine constantly binds with thymine, and cytosine constantly binds through guanine.

Since details bases constantly appear in pairs, they will have actually equal percentages of the DNA composition. The percentage of adenine will certainly equal the percentage of thymine, and also the portion of cytosine will equal the percentage of guanine. Together, this percentages will include to 100%.

*

We understand that the sample is 35% adenine, i m sorry tells us that the is likewise 35% thymine.

*

*

We know that cytosine and also guanine pair together and also will be present in equal amounts, so we deserve to divide this final total by 2 to uncover our answer.

*

The sample is 35% adenine, 35% thymine, 15% guanine, and 15% cytosine.


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Example inquiry #38 : Dna and Rna structure


A strand the DNA was measured come contain 22% adenine. What is the DNA"s composition of the other bases?


Possible Answers:

22% Adenine, 22% Cytosine, 28% Guanine, 28% Thymine 


22% Adenine, 22% Thymine, 28% Cytosine, 28% Guanine


22% Adenine, 22% Guanine, 28% Cytosine, 28% Thymine


22% Adenine, 22% Uracil, 28% Cytosine, 28% Guanine


22% Adenine, 22% Guanine, 28% Cytosine, 28% Uracil


Correct answer:

22% Adenine, 22% Thymine, 28% Cytosine, 28% Guanine


Explanation:

We can use Chargaff"s ascendancy to uncover the continuing to be compositional percentages. Adenine constantly pairs with thymine, so their percentages will certainly be equal. Cytosine constantly pairs v guanine, so your percentages will likewise be equal. The amount of all 4 percentages have to equal 100%.

*

We understand that the sample is 22% adenine; this tells us it is likewise 22% thymine.

*

*

*

Since cytosine and also guanine are current in same amounts, we have the right to simply division their sum by 2.

*

*

The last composition is 22% adenine, 22% thymine, 28% cytosine, and also 28% guanine.

Uracil is only uncovered in RNA. 


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Example question #39 : Dna and also Rna framework


A strand that RNA is written of 20% adenine and also 30% guanine.

What is the strand"s composition of the other bases?


Possible Answers:

20% Adenine, 30% Guanine, 20% Uracil, 30% Cytosine

 


Cannot identify from the given information


20% Adenine, 30% Guanine, 30% Thymine, 20% Cytosine

 


20% Adenine, 30% Guanine, 30% Uracil, 20% Cytosine


20% Adenine, 30% Guanine, 20% Thymine, 30% Cytosine

 


Correct answer:

Cannot recognize from the given information


Explanation:

Chargaff"s dominion only applies to DNA. RNA is single-stranded, and also thus, no basic pairing occurs.

Think of a strand the DNA. Each base pairs with a details partner, enabling us to recognize their percentages: adenine and also thymine are always equal, and also cytosine and guanine are always equal. In RNA, with this pairing absent, over there is no correlation between the basic percentages. A strand might be 20% adenine, 30% guanine, 5% cytosine, and 45% uracil; we just cannot draw any type of conclusions.


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Example concern #40 : Dna and also Rna framework


What space the monomers the DNA?


Possible Answers:

Nucleotides


Phosphate-sugar backbone


Nitrogen atoms


Deoxyribose sugars


Correct answer:

Nucleotides


Explanation:

A polymer is a macromolecule that is comprised of subunits the are repetitive or very similar. This subunits are referred to as monomers. DNA is a polymer made up of monomer units called nucleotides. Nucleotides are made up of a phosphate group, a five-carbon street (deoxyribose, in the situation of DNA), and a change nitrogenous base. There are four various nucleotides that make up the polymer of DNA: thymine, cytosine, adenine, and guanine. These 4 nucleotides belong to two different classes based upon structure. Adenine and also guanine space purines that have actually two carbon-nitrogen rings. Thymine and also cytosine space pyrimidines that have actually only one carbon-nitrogen ring.


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