16-06-2012, 11:15 PM
Eu incercam sa demonstrez un punct de vedere. Trecem la biochimie daca vreti:
(d) Attempts to treat cystic fibrosis with gene therapy have not yet been successful.
Use information in the article to suggest reasons why inserting the correct gene
into a cell may not be all that is required.
(e) Explain how RNA templates are used to specify the chemical structure of a protein.
(f ) Explain how a transcription factor might ‘recognise a particular stretch of DNA’
(i) Explain why a DNA strand is not read ‘in six different ways’
(j) About 10 million years ago, an event led to the production of antifreeze protein
in one Antarctic fish. Explain why almost all Antarctic fish now contain antifreeze
protein.
Thalassaemia is the name of a group of inherited blood disorders that affect the
body’s ability to produce haemoglobin in red blood cells. Red blood cells are
produced in bone marrow.
Oxygen in the lungs binds to haemoglobin and is carried to the cells of the body to
be used in respiration.
Beta thalassaemia is the result of a mutation in the gene coding for the β chain of
haemoglobin. If a person inherits gene mutations from both parents, this person
will show symptoms of anaemia and will require blood transfusions. Symptoms of
anaemia include tiredness and breathlessness.
*(a) Using the information given above and your knowledge of gene mutation,
suggest why a person with beta thalassaemia has symptoms of anaemia.
(b) Describe the roles of messenger RNA (mRNA) and transfer RNA (tRNA) in protein
synthesis.
(i) Messenger RNA
Mai vreti?
(d) Attempts to treat cystic fibrosis with gene therapy have not yet been successful.
Use information in the article to suggest reasons why inserting the correct gene
into a cell may not be all that is required.
(e) Explain how RNA templates are used to specify the chemical structure of a protein.
(f ) Explain how a transcription factor might ‘recognise a particular stretch of DNA’
(i) Explain why a DNA strand is not read ‘in six different ways’
(j) About 10 million years ago, an event led to the production of antifreeze protein
in one Antarctic fish. Explain why almost all Antarctic fish now contain antifreeze
protein.
Thalassaemia is the name of a group of inherited blood disorders that affect the
body’s ability to produce haemoglobin in red blood cells. Red blood cells are
produced in bone marrow.
Oxygen in the lungs binds to haemoglobin and is carried to the cells of the body to
be used in respiration.
Beta thalassaemia is the result of a mutation in the gene coding for the β chain of
haemoglobin. If a person inherits gene mutations from both parents, this person
will show symptoms of anaemia and will require blood transfusions. Symptoms of
anaemia include tiredness and breathlessness.
*(a) Using the information given above and your knowledge of gene mutation,
suggest why a person with beta thalassaemia has symptoms of anaemia.
(b) Describe the roles of messenger RNA (mRNA) and transfer RNA (tRNA) in protein
synthesis.
(i) Messenger RNA
Mai vreti?
probabil n-ai primit niciodata
telegramele mele sau poate
nu credeai ca e vital cand
lumea mea se descompunea
in ceasuri si goluri
de mine
au imbatranit in cadente
si sentimentele mele
sub greutatea
atator vieti netraite...
telegramele mele sau poate
nu credeai ca e vital cand
lumea mea se descompunea
in ceasuri si goluri
de mine
au imbatranit in cadente
si sentimentele mele
sub greutatea
atator vieti netraite...
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