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The Thread
of Life
Topic 3 Unit F334

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DNA is a double-stranded helix.
The strands are made up of sugar groups (deoxyribose), phosphate groups and four
different bases ­ adenine, thymine, cytosine and guanine.
These groups join together in a condensation reaction to form a long chain of alternating
sugar-phosphate groups. One of the four bases is joined…

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DNA forms by condensation polymerisation
The backbone of DNA is based on a repeated pattern of a sugar group and a phosphate
group. The full name of DNA, deoxyribonucleic acid, gives you the name of the sugar
present - deoxyribose. Deoxyribose is a modified form of another sugar called ribose.…

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It is also a condensation reaction that connects base molecules to sugars in the
sugar-phosphate backbone. All of the bases have an NH group in their structure. It's the
N atom of the NH group that bonds to deoxyribose ­ eliminating an OH group from the
sugar and H from…

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Stage 1: Transcription
The first is messenger RNA, or mRNA. This is formed in the nucleus of the cell. It
rewrites the sequence of bases of a section of DNA in a process called transcription.
mRNA carries the code for building a specific protein from the nucleus to the ribosomes…

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Pages in this set

Page 1

Preview of page 1

Page 2

Preview of page 2
The Thread
of Life
Topic 3 Unit F334

Page 3

Preview of page 3

Page 4

Preview of page 4
DNA is a double-stranded helix.
The strands are made up of sugar groups (deoxyribose), phosphate groups and four
different bases ­ adenine, thymine, cytosine and guanine.
These groups join together in a condensation reaction to form a long chain of alternating
sugar-phosphate groups. One of the four bases is joined…

Page 5

Preview of page 5

Page 6

Preview of page 6
DNA forms by condensation polymerisation
The backbone of DNA is based on a repeated pattern of a sugar group and a phosphate
group. The full name of DNA, deoxyribonucleic acid, gives you the name of the sugar
present - deoxyribose. Deoxyribose is a modified form of another sugar called ribose.…

Page 7

Preview of page 7

Page 8

Preview of page 8
It is also a condensation reaction that connects base molecules to sugars in the
sugar-phosphate backbone. All of the bases have an NH group in their structure. It's the
N atom of the NH group that bonds to deoxyribose ­ eliminating an OH group from the
sugar and H from…

Page 9

Preview of page 9

Page 10

Preview of page 10
Stage 1: Transcription
The first is messenger RNA, or mRNA. This is formed in the nucleus of the cell. It
rewrites the sequence of bases of a section of DNA in a process called transcription.
mRNA carries the code for building a specific protein from the nucleus to the ribosomes…

Comments

No comments have yet been made