DNA Structure

Question 1

What are Nucleatides?

Answer 1

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

Question 2

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

Answer 2

James Watson and Francis Crick in 1953

Question 3

What are the 3 parts a nucleotide is composed of?

Answer 3

A phosphate, a sugar, and a nitrogenous base.

Question 4

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

Answer 4

True

Question 5

The repeating pattern of sugar phosphate is called what

Answer 5

The backbone

Question 6

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

Answer 6

True

Question 7

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

Answer 7

False. They are different on the right.

Question 8

The yelllw phosphate group is called what?

Answer 8

5 ‘ (five prime end)

Question 9

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

Answer 9

True!

Question 10

A double helix is made by doing what?

Answer 10

Twisting two strands together

Question 11

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

Answer 11

True!

Question 12

Bases are held by weak hydrogen bonds. True or false

Answer 12

True!

Question 13

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

Answer 13

True!

Question 14

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

Answer 14

False. It is every 10 nucleotides.

Question 15

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

Answer 15

True

Question 16

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

Answer 16

True

Question 17

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

Answer 17

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

Question 18

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

Answer 18

True

Question 19

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

Answer 19

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

Question 20

Cytosine bases always pair with Guanine. T or F

Answer 20

True.

Question 21

Thymine always pairs with Guanine. T or F

Answer 21

False. Thymine always pairs with Adenine.

Question 22

Thymine always pairs with Adenine. T or F.

Answer 22

True!

Question 23

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

Answer 23

True

Question 24

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

Answer 24

True. G & C and A & T

Question 25

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

Answer 25

False. They can be pulled apart.

Question 26

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

Answer 26

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

Question 27

When must DNA be separated ?

Answer 27

During important processes like replication and transcription

Question 28

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

Answer 28

True. (AT) and (GC)

Question 29

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

Answer 29

False. A base pair is abbreviated as bp

Question 30

1 Kb = 1000 bp. True or false?

Answer 30

True

Question 31

How many base pairs is in the human genome?

Answer 31

3.2 billion bp

Question 32

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

Answer 32

True

Question 33

A single strand of DNA is made by linking what?

Answer 33

Nucleotides