Explanation:

When determining complementary strands, there are a couple of important points come consider. First, remember that uracil is only uncovered in RNA. We can eliminate any type of answer choices that save uracil. Second, remember the DNA is anti-parallel. This method that the 3" end of the layout strand must complement up with the 5" finish of the safety strand. Flip any type of answers that have both 3" end together. Finally, make certain that the bases align correctly. Adenine and thymine should constantly pair and cytosine and guanine should always pair.

You are watching: If a dna sample were composed of 15% adenine, what would be the percentage of guanine?

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 certainly be 3"-GCAAT-5". This answer would still it is in correct! it would just need to be flipped, together in the 2nd step outlined above.


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Example concern #32 : Dna and also Rna structure


Which the the following can 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 the is antiparallel, meaning the 5" finish of one strand matches up with the 3" end of the various other strand. Nitrogenous bases hold the strands with each other via hydrogen bonding. This bases space adenine (A), thymine (T), guanine (G), and cytosine (C). Adenine (A) have the right to only pair through thymine (T), and also guanine (G) deserve to only pair v cytosine (C).

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

5"-CTAGAG-3"

3"-GATCTC-5"

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


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Example question #33 : Dna and also Rna framework


Which that the following defines 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 mountain are among the main organic macromolecules, and also include DNA and RNA. A nucleotide is a DNA monomer, if a ribonucleotide is an RNA monomer. Countless nucleotides space bonded with each other by phosphodiester bonds to kind a solitary molecule that DNA. The pattern of nucleotides is used to store and transmit hereditary information. A nucleotide is created of a phosphate group, a nitrogenous base, and a pentose sugar (deoxyribose).


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Example question #34 : Dna and Rna structure


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


Possible Answers:

AGGTGGACACCG


GCCACAGGTGGA


CATGCGTAGATC


GCGGATGTGTCC


TGACAAACTTGT


Correct answer:

TGACAAACTTGT


Explanation:

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

Since we are searching for the sequence with the lowest melting point, we want the lowest percent of cytosine and guanine, and the highest possible percentage of adenine and thymine.


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Example concern #35 : Dna and also Rna structure


A ar of double-stranded DNA is composed of 35% adenine bases. What is the portion of cytosine bases in the section of DNA?


Possible Answers:

*


*


*


More information is essential in order come answer the question



Correct answer:


Explanation:

Since we know that 35% that the bases in the section of DNA space adenine, we deserve to conclude that 35% that the bases room thymine. This is due to the fact that adenine will constantly pair through thymine, so there will certainly be just as many thymine bases as adenine bases. Together, adenine and thymine write 70% that the segment.

*

*

This means that 30% of the section is written of guanine-cytosine pairs.

*

Since these two bases will be equal in quantity, 15% the the DNA ar will it is in cytosine bases.

*


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Example concern #36 : Dna and Rna structure


In a sample of DNA, 30% of the bases are uncovered to it is in guanine. What portion of the bases in the sample space thymine?


Possible Answers:

*


Correct answer:

*


Explanation:

Guanine will certainly pair with cytosine. From this knowledge, we have the right to assume that there will certainly be one equal variety of guanine and also cytosine residues in the sample. Every guanine must have actually a cytosine counterpart.

*

The complete composition that the DNA sample need to be accounted because that by the amount of all the bases.

*

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

*

*

Like cytosine and guanine, adenine and also thymine need to be current in equal amounts in bespeak to type proper basic pairs. We can reasonably assume that half of the staying DNA will certainly consist of every residue.

*


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Example inquiry #37 : Dna and also Rna structure


An analysis of a DNA sample suggests it has 35% adenine. What percent of the sample would certainly be cytosine? 


Possible Answers:
Correct answer:

*


Explanation:

There are four nitrogenous bases discovered in DNA: adenine, thymine, cytosine, and guanine. Adenine constantly binds with thymine, and also cytosine always binds through guanine.

Since details bases constantly appear in pairs, castle will have actually equal percentages that the DNA composition. The percentage of adenine will equal the percent of thymine, and the percent of cytosine will equal the portion of guanine. Together, this percentages will add to 100%.

*

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

*

*

We recognize that cytosine and guanine pair together and will be current in same amounts, therefore we deserve to divide this final complete by 2 to discover our answer.

*

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


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Example inquiry #38 : Dna and also Rna structure


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


Possible Answers:

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


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


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


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


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


Correct answer:

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


Explanation:

We deserve to use Chargaff"s ascendancy to uncover the remaining compositional percentages. Adenine always pairs through thymine, so your percentages will be equal. Cytosine always pairs v guanine, so their percentages will additionally be equal. The amount of all 4 percentages have to equal 100%.

*

We know that the sample is 22% adenine; this tells united state it is also 22% thymine.

*

*

*

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

*

*

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

Uracil is only discovered in RNA. 


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Example inquiry #39 : Dna and Rna framework


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

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


Possible Answers:

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


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

 


Cannot determine from the given information


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

 


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

 


Correct answer:

Cannot determine from the given information


Explanation:

Chargaff"s dominion only uses to DNA. RNA is single-stranded, and thus, no base pairing occurs.

Think that a strand of DNA. Each base pairs with a specific partner, allowing us to identify their percentages: adenine and also thymine are constantly equal, and cytosine and guanine are constantly equal. In RNA, v this pairing absent, there is no correlation in between the basic percentages. A strand might be 20% adenine, 30% guanine, 5% cytosine, and also 45% uracil; we simply cannot draw any conclusions.


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Example concern #40 : Dna and Rna framework


What room the monomers that DNA?


Possible Answers:

Phosphate-sugar backbone


Nitrogen atoms


Deoxyribose sugars


Nucleotides


Correct answer:

Nucleotides


Explanation:

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

See more: Which Institution Receives The Most News Coverage, Government Multiple Choice Ex2 Ch10 Flashcards


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