DNA Structure Flashcards

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1
Q

What are Nucleatides?

A

a compound consisting of a nucleoside linked to a phosphate group. Nucleotides form the basic structural unit of nucleic acids such as DNA.

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2
Q

Who solved the structure of dna using a wire frame model?

A

James Watson and Francis Crick in 1953

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3
Q

What are the 3 parts a nucleotide is composed of?

A

A phosphate, a sugar, and a nitrogenous base.

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4
Q

T or F. The bases are different between nucleotides but the phosphate and sugar groups are the same

A

True

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5
Q

The repeating pattern of sugar phosphate is called what

A

The backbone

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6
Q

A strand of dna has a head and a tail. True or false?

A

True

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7
Q

The ends of the strand on the right are the same on dna. True or false

A

False. They are different on the right.

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8
Q

The yelllw phosphate group is called what?

A

5 ‘ (five prime end)

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9
Q

The bottom with the blue sugar is called 3’ three prime end. True or false

A

True!

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10
Q

A double helix is made by doing what?

A

Twisting two strands together

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11
Q

Sugar phosphate back-bone forms side of a ladder. T or F?

A

True!

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12
Q

Bases are held by weak hydrogen bonds. True or false

A

True!

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13
Q

Two strands of dna are anti-parallel meaning they u go along side each other but in opposite directions. T or f?

A

True!

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14
Q

A double helix makes one complete turn every 50 nucleotides. True or false?

A

False. It is every 10 nucleotides.

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15
Q

There are 0.34 nm between each base pair or 3.4 for one full twist. T or F?

A

True

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16
Q

The double helix is the same width along its entire length. true or false
.

A

True

17
Q

A base pair is made by two double rings. True or false

A

FalseZ it is one double ring and one single ring of bases

18
Q

Two single rings or two double ring pairs would result in a bump or a depth in the width. T or F

A

True

19
Q

Bumps and dips are often used to damage enzymes to destroy mutations. T or F

A

False. They are used to repair enzymes and identify mutations.

20
Q

Cytosine bases always pair with Guanine. T or F

A

True.

21
Q

Thymine always pairs with Guanine. T or F

A

False. Thymine always pairs with Adenine.

22
Q

Thymine always pairs with Adenine. T or F.

A

True!

23
Q

Base pairs always have one purine and one pyramiding. T or F

A

True

24
Q

The three hydrogen fingers always pair with three hydrogen fingers. T or F

A

True. G & C and A & T

25
Q

The hydrogen bonds holding two strands together cannot be pulled apart. T or F

A

False. They can be pulled apart.

26
Q

Covalent bonds are weak bonds and can be pulled apart. T or F

A

False. Hydrogen bonds are weak bonded. Covalent bonds do not break easily.

27
Q

When must DNA be separated ?

A

During important processes like replication and transcription

28
Q

Dna is often described in terms of base pairs. T or F

A

True. (AT) and (GC)

29
Q

A base pair is sometimes abbreviat r as Kb. T or F

A

False. A base pair is abbreviated as bp

30
Q

1 Kb = 1000 bp. True or false?

A

True

31
Q

How many base pairs is in the human genome?

A

3.2 billion bp

32
Q

A single strand of DNA is made by linking nucleotides. True or false.

A

True

33
Q

A single strand of DNA is made by linking what?

A

Nucleotides