Explanation:

DNA is a double-stranded helix. The two sugar-phosphate backbones are linked by hydrogen bonds the for between nitrogenous bases. The DNA bases space adenine (A), thymine (T), cytosine (C), and also guanine (G). In DNA, adenine constantly pairs with thyine and also cytosine constantly pairs through guanine. These pairings occur because of geometry that the base,s permit hydrogen binding to form only between the "right" pairs. Adenine and also thymine will kind two hydrogen bonds, vice versa, cytosine and also guanine will type three hydrogen bonds. This hydrogen bonding brings stability to the DNA. 


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Example question #42 : Dna


The double-helix framework of DNA was found using X-ray crystallography (Rosalind Franklin) and elucidated by Watson and also Crick. Prior to this discovery, it to be previously well-known that DNA is comprised of 4 nucleotide bases: adenine, thymine, guanine, and cytosine. Adenine always binds to thymine, if guanine always binds come cytosine.

You are watching: In dna guanine always pairs with


You analysis a double-helix and determine that 17% of the helix is made up of the nucleotide adenine (A). What percentage of the same helix should be made up of the nucleotide guanine (G)?


Possible Answers:

*


*



*


*


Correct answer:


Explanation:

Nucleotides the bind together will constantly be present in equal quantities in a sample the DNA. This principle is well-known as Chargaff"s rule. Essentially, the portion of adenine will be equal to the portion of thymine, if the portion of guanine will be same to the portion of cytosine.

Together, all of the percentages must include up to 100%.

We know that the sample is 17% adenine, which means it is likewise 17% thymine.

We can use this equation to resolve for the portion of guanine.

Guanine and also cytosine pair together, which method they will be current in equal amounts. To uncover the portion of guanine, we can simply division by 2.

You can examine your prize if needed:


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Example concern #43 : Dna


In complementary basic pairing of DNA, guanine constantly pairs with __________ and adenine always pairs with __________.


Possible Answers:

cytosine . . . Uracil


guanine . . . Adenine


thymine . . . Cytosine


cytosine . . . Thymine


Correct answer:

cytosine . . . Thymine


Explanation:

The 4 nitrogenous bases that DNA space thymine, adenine, guanine, and cytosine. Guanine and cytosine space bound together by 3 hydrogen bonds; whereas, adenine and thymine room bound together by 2 hydrogen bonds. This is recognized as complementary basic pairing. In RNA, the nucleotide thymine is changed by the nucleotide uracil.


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Example question #44 : Dna


Which type of link is responsible for holding complementary base pairs together?


Possible Answers:

Single covalent bond


Hydrogen bond


Double covalent bond


Ionic bond


Correct answer:

Hydrogen bond


Explanation:

DNA (Deoxyribonucleic acid) is a chain of two strands that nucleotide the are connected to one one more through hydrogen bonding and arranged right into a structure well-known as a double-helix. Nucleotides room molecular components of DNA that room composed that a deoxyribose sugar, a nitrogenous base, and a phosphate group. The backbone of DNA is composed of phosphodiester bonds consisted of of interchanging phosphate groups and also deoxyribose sugars. The 4 nitrogenous bases that DNA are thymine, adenine, guanine, and also cytosine. Guanine and also cytosine space bonded together by three hydrogen bonds; whereas, adenine and also thymine space bonded together by 2 hydrogen bonds. This is known as complementary basic pairing. One strand that the DNA double helix will certainly be in a 5’

*
 3’ direction in relationship to the –OH group on the deoxyribose sugar. The other strand is oriented in the 3’
*
 5’ direction.


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Example question #45 : Dna


The orientation the the two strands of the DNA molecule are considered to be __________.


Possible Answers:

parallel


antiparallel


perpendicular


transverse


Correct answer:

antiparallel


Explanation:

DNA is a chain of 2 strands of nucleotides that are linked to one another through hydrogen bonds and arranged into a structure recognized as a double-helix. Nucleotides space molecular materials of DNA that room composed that a deoxyribose sugar, a nitrogenous base, and a phosphate group. The backbone that DNA is composed of phosphodiester bonds made up of interchanging phosphate groups and also deoxyribose sugars. The four nitrogenous bases the DNA are thymine, adenine, guanine, and cytosine. Guanine and also cytosine room bound together by three hydrogen bonds; whereas, adenine and thymine room bound together by 2 hydrogen bonds. This is recognized as complementary base pairing. One strand the the DNA twin helix will certainly be in a 5’

*
 3’ direction in relation to the
*
 group on the deoxyribose sugar. The other strand is oriented in the 3’
*
 5’ direction. This is why DNA is thought about antiparallel.


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Example inquiry #46 : Dna


You analyze a double-helix and also determine the 17% that the helix is consisted of of the nucleotide adenine (A). What percentage of the same helix must be made up of the nucleotide guanine (G)?


Possible Answers:
Correct answer:


Explanation:

Nucleotides the bind with each other will constantly be present in equal quantities in a sample the DNA. This principle is well-known as Chargaff"s rule. Essentially, the portion of adenine will certainly be same to the percentage of thymine, if the portion of guanine will certainly be same to the portion of cytosine.

Together, all of the percentages must include up come 100%.

We understand that the sample is 17% adenine, which way it is likewise 17% thymine.

We can use this equation to resolve for the percent of guanine.

Guanine and cytosine pair together, which way they will be existing in same amounts. To find the portion of guanine, we deserve to simply division by 2.

You can inspect your price if needed:


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Example question #47 : Dna


DNA polymerase is offered to crate a new DNA strand based upon the following template strand.

5"-GCCTCATGA-3"


Which the the complying with shows the correct complementary strand?


Possible Answers:

5"-UCAUGAGGC-3"


5"-TCATGAGGC-3"


5"-CGGAGTACT-3"


5"-AGTACTCCG-3"


Correct answer:

5"-TCATGAGGC-3"


Explanation:

When determining the complementary strand, remember that it will certainly be created in the contrary direction of the template strand. This way that the new strand"s 5" finish will start at the 3" end of the layout strand. The safety strand will additionally be composed of the nucleotides that complete the basic pairs found in DNA (A-T and C-G).

Template: 5"-GCCTCATGA-3"

Answer: 5"-TCATGAGGC-3"

To check out these pairs complement up, the 3" finish of the answer should align with the 5" finish of the template.

Template: 5"-GCCTCATGA-3"

Answer (3"-5"): 3"-CGGAGTACT-5"


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Example inquiry #48 : Dna


Which the the adhering to bases are purines?


Possible Answers:

Adenine and also guanine


Adenine and also thymine


Adenine, thymine, and uracil


Guanine and also cytosine


Cytosine, thymine, and also uracil


Correct answer:

Adenine and guanine


Explanation:

There room two classes of bases in DNA and RNA: purines and also pyrimidines. The difference in between these class is the structure of the base. Purines have actually two ring in your structure, if pyrimidines have actually only one. Purines will pair through pyrimidines.

The purines space adenine and guanine, and the pyrimidines space thymine, cytosine, and also uracil. You have the right to remember that the bases the contain a "y" room pyrimidines (thymine and cytosine).


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Example question #41 : Dna


What is a common feature of all the nucleotides in DNA?


Possible Answers:

Each that the nucleotides have the right to bind to any kind of of the other ones


They are all provided in equal amounts in a strand that DNA


They room bound come a sugar backbone


They are the same nucleotides supplied in RNA


They save on computer the very same atoms in various structures


Correct answer:

They space bound to a sugar backbone


Explanation:

There are 4 nitrogenous bases in DNA: adenine, guanine, cytosine, and thymine. A nucleotide is created of among these bases bound to a deoxyribose sugar and also a phosphate group. Polymers the nucleotides form strands of DNA, which adhere to one an additional by hydrogen bonding between the bases.

Each strand of DNA is unique and also may contain any kind of ratio that the nitrogenous bases, however strands of DNA will always be complementary to one another. The structure of the bases calls for that adenine tie to thymine and also cytosine tie to guanine to maintain the structural integrity the the DNA molecule. RNA does not contain thymine, and instead supplies uracil.


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Example question #50 : Dna


The DNA of a eukaryotic cell is found to save on computer 30% cytosine. The DNA likewise contains __________.


Possible Answers:

20% adenine


20% guanine


30% thymine


30% adenine


Correct answer:

20% adenine


Explanation:

There are 4 bases in DNA: adenine, thymine, guanine, and cytosine. Adenine constantly pairs v thymine, therefore the variety of adenine residues constantly equals the number of thymine residues. Guanine constantly pairs through cytosine, which method they are constantly present in equal amounts as well. If one strand consists of three cytosine bases and five thymine bases, climate the opposite strand need to contain 3 guanine bases and also five adenine bases.

The trick to this problem is remembering the the sum of all four bases by percentage should be 100%.

*

We recognize that 30% of the bases are cytosine. Due to the fact that cytosine pairs with guanine, there is also 30% guanine.

*

*

That leave us v 40% the the bases being thymine and also adenine.

*

Since adenine and thymine will be equal, each will represent 20% the the DNA composition.

See more: What Does One Decimal Place Mean, Definition Of Decimal Place

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