Explanation:

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

You are watching: If 20 of a dna sample is made up of thymine

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 certainly still be correct! it would simply need to be flipped, as in the second step outlined above.


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Example question #31 : Dna and Rna structure


Which that the following could be a segment that DNA?


Possible Answers:

5\"-CTCGTG-3\"

3\"-GATCTC-5\"


5\"-AGATAG-3\"

3\"-GATCTC-5\"


5\"-CTAGAG-3\"

3\"-GATCTC-5\"


5\"-CTCGTG-3\"

3\"-AATGTA-5\"


5\"-GTCGAT-3\"

3\"-GATCTC-5\"


Correct answer:

5\"-CTAGAG-3\"

3\"-GATCTC-5\"


Explanation:

DNA is a twin stranded molecule that is antiparallel, an interpretation the 5\" finish of one strand matches up with the 3\" end of the other strand. Nitrogenous bases organize the strands with each other via hydrogen bonding. These bases room adenine (A), thymine (T), guanine (G), and cytosine (C). Adenine (A) deserve to only pair v thymine (T), and also guanine (G) deserve to only pair with cytosine (C).

The exactly answer presents 2 strands that are antiparallel and show ideal 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 Rna framework


Which of the following explains the contents of a nucleotide? 


Possible Answers:

ATP, a hexose sugar, and an amino acid 


ATP, a pentose sugar, and also a nitrogenous base 


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


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


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


Correct answer:

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


Explanation:

Nucleic acids are one of the main biological macromolecules, and include DNA and also RNA. A nucleotide is a DNA monomer, when a ribonucleotide is one RNA monomer. Countless nucleotides space bonded with each other by phosphodiester bond to kind a single molecule of DNA. The pattern of nucleotides is offered to store and also transmit hereditary information. A nucleotide is written of a phosphate group, a nitrogenous base, and a pentose sugar (deoxyribose).


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Example question #31 : Dna and also Rna framework


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


Possible Answers:

GCCACAGGTGGA


TGACAAACTTGT


AGGTGGACACCG


GCGGATGTGTCC


CATGCGTAGATC


Correct answer:

TGACAAACTTGT


Explanation:

Cytosine and guanine form three hydrogen bonds through each other, when adenine and tyrosine only kind two hydrogen bonds. This way that strands that DNA v a higher percentage that cytosine and guanine will certainly have greater melting points.

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


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Example inquiry #31 : Dna and Rna structure


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


Possible Answers:

\"*\"


\"*\"


More info is needed in order to answer the question


\"*\"



Correct answer:


Explanation:

Since we know that 35% of the bases in the section of DNA are adenine, we can conclude that 35% of the bases room thymine. This is because adenine will constantly pair v thymine, for this reason there will be just as numerous thymine bases as adenine bases. Together, adenine and also thymine compose 70% of the segment.

\"*\"

\"*\"

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

\"*\"

Since these 2 bases will be equal in quantity, 15% that the DNA section will be cytosine bases.

\"*\"


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Example concern #31 : Dna and Rna structure


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


Possible Answers:

\"*\"


Correct answer:

\"*\"


Explanation:

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

\"*\"

The total composition that the DNA sample must be accounted because that by the sum of every the bases.

\"*\"

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

\"*\"

\"*\"

Like cytosine and also guanine, adenine and thymine should be present in equal quantities in stimulate to form proper basic pairs. We can reasonably assume that fifty percent of the remaining DNA will consist of each residue.

\"*\"


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Example concern #37 : Dna and Rna framework


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


Possible Answers:
Correct answer:

\"*\"


Explanation:

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

Since details bases always appear in pairs, lock will have actually equal percentages the the DNA composition. The portion of adenine will certainly equal the portion of thymine, and also the portion of cytosine will certainly equal the percent of guanine. Together, these percentages will include to 100%.

\"*\"

We understand that the sample is 35% adenine, i beg your pardon tells us that the is likewise 35% thymine.

\"*\"

\"*\"

We know that cytosine and guanine pair together and also will be existing in same amounts, so we have the right to divide this final full by 2 to discover our answer.

\"*\"

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


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Example concern #38 : Dna and Rna framework


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


Possible Answers:

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


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


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


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


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


Correct answer:

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


Explanation:

We have the right to use Chargaff\"s rule to find the staying compositional percentages. Adenine constantly pairs through thymine, so their percentages will certainly be equal. Cytosine constantly pairs with guanine, so their percentages will also be equal. The sum of all four percentages have to equal 100%.

\"*\"

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

\"*\"

\"*\"

\"*\"

Since cytosine and also guanine are current in equal amounts, we can simply divide their amount by 2.

\"*\"

\"*\"

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

Uracil is only discovered in RNA. 


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Example inquiry #39 : Dna and also Rna framework


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

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


Possible Answers:

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

 


Cannot determine from the given information


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

 


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

 


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


Correct answer:

Cannot recognize from the given information


Explanation:

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

Think the a strand that DNA. Each base pairs v a details partner, permitting us to identify their percentages: adenine and also thymine are always equal, and cytosine and also guanine are always equal. In RNA, through 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 just cannot draw any kind of conclusions.


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Example inquiry #31 : Dna and Rna framework


What space the monomers of DNA?


Possible Answers:

Deoxyribose sugars


Nucleotides


Nitrogen atoms


Phosphate-sugar backbone


Correct answer:

Nucleotides


Explanation:

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

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