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DNA STRUCTURE 3.3.3 page 63-74. What are the monomers of the nucleic acids? What are the elements found in the nucleic acids? Where is DNA found in a prokaryotic cell? In eukaryotic cell. STRUCTURE OF NUCLEIC ACIDS. Types of nucleic acids :. Polynucleotide 3.3.3.

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dna structure 3 3 3 page 63 74
DNA STRUCTURE 3.3.3page 63-74
  • What are the monomers of the nucleic acids?
  • What are the elements found in the nucleic acids?

Where is DNA found in a prokaryotic cell? In eukaryotic cell

structure of nucleic acids
STRUCTURE OF NUCLEIC ACIDS
  • Types of nucleicacids:
how is polymer of nucleic acids formed
How is polymer of nucleicacidsformed?

Whatarethechemicalbondsbetweenthem?

Nitrogeneous base

phosphate

ribose

Nucleoside

dna deoxyribonucleic acid
DNA (deoxyribonucleic acid)
  • Functions of the DNA:

1-

2-

3 4 replication of dna
3.4. Replication of DNA

1-

2-

3-

4-

* This process is called semi-conservative replication. Why?

mrna messenger rna
mRNA (messenger RNA):

3.5 Transcription, translation

tRNA (transfer RNA):

rRNA (ribosamal RNA)

3 5 how does dna control cellular activities
3.5 How does DNA control cellular activities?
  • How does Mr.Du Rand control school activities?

1-

2-

slide18
How does the information in DNA lead to the synthesis of specific proteins? How is the information in DNA transported from the nucleus to the cytoplasm?
language of life
Language of life
  • There are 4 letters in the language of DNA (A,G,T,C)
  • Three letters form a word such as AAA, GTA ….. There are 64 different words in this language.These triplet nucleotides (words) are called genetic code.
  • 61 genetic codes code amino acids, 3 of them do not code.
language of rna
Language of RNA
  • mRNA takes genetic information from DNA by transcription.
  • The letters of RNA are A, G, C, U. Three letters form a codon which codes an amino acid.
  • There are 64 different codons, only 61 code amino acids, 3 of them do not code amino acid.
slide22
DNA has AAGTCGCTCACC sequence

mRNA hasUUCAGCGAGUGGsequence

There are 64 different codons

on mRNA.

Whatis the amino acid

sequence of a polypeptide

which is produced from this

mRNA?

translation
Translation

tRNAmolecules transfer amino acidsaccordingtocodon anti-codonrecognition.

3 5 5 one gene one enzyme page 71 74
3.5.5. One gene-one enzymepage 71-74

In the past it is believed that each gene codes an enzyme. This hypothesis is called one gene-one enzyme.

After further researches, one gene one enzyme hypothesis is modified as one gene one polypeptide

Each gene works by coding for the synthesis of one particular protein, such as an enzyme.

questions
Questions:
  • A DNA strand has AAGTCCGCTTAA nucleotide sequence.

1- What will be nucleotide sequence of the complementary strand of this DNA strand?

2- What will be nucleotide sequence of the mRNA which is transcribed from this DNA strand?

3- What would happen to the DNA strand after transcription?