Qualification > Sciences
ALL CIE BIOLOGY DOUBTS HERE !!!
**RoRo**:
--- Quote from: Hamlet on December 02, 2010, 05:18:30 pm ---I dont think the first evidence is required but the second one about DNA replication and semi-conservative method is definitely needed.
I say, you check your syllabus. :)
--- End quote ---
Here's what the syllabus says:
(a) describe the structure of RNA and DNA and explain the importance of base pairing and hydrogen
bonding;
(b) explain how DNA replicates semi-conservatively during interphase;
(c) state that a gene is a sequence of nucleotides as part of a DNA molecule, which codes for a polypeptide;
(d) describe the way in which the nucleotide sequence codes for the amino acid sequence in a polypeptide
with reference to the nucleotide sequence for HbA (normal) and HbS (sickle cell) alleles of the gene for
the ?-haemoglobin polypeptide;
(e) describe how the information on DNA is used during transcription and translation to construct
polypeptides, including the role of messenger RNA (mRNA), transfer RNA (tRNA) and the ribosomes;
(f) explain that, as enzymes are proteins, their synthesis is controlled by DNA;
(g) use the knowledge gained in this section in new situations or to solve related problems.
It doesn't mention anything about it [evidence that DNA in the chromosome is the genetic material]
Deadly_king:
--- Quote from: The Secret on December 03, 2010, 05:28:05 am ---Here's what the syllabus says:
(a) describe the structure of RNA and DNA and explain the importance of base pairing and hydrogen
bonding;
(b) explain how DNA replicates semi-conservatively during interphase;
(c) state that a gene is a sequence of nucleotides as part of a DNA molecule, which codes for a polypeptide;
(d) describe the way in which the nucleotide sequence codes for the amino acid sequence in a polypeptide
with reference to the nucleotide sequence for HbA (normal) and HbS (sickle cell) alleles of the gene for
the ?-haemoglobin polypeptide;
(e) describe how the information on DNA is used during transcription and translation to construct
polypeptides, including the role of messenger RNA (mRNA), transfer RNA (tRNA) and the ribosomes;
(f) explain that, as enzymes are proteins, their synthesis is controlled by DNA;
(g) use the knowledge gained in this section in new situations or to solve related problems.
It doesn't mention anything about it [evidence that DNA in the chromosome is the genetic material]
--- End quote ---
The evidence is not required. But you must only know that the DNA is actually the genetic material and not the protein.
The second one is essential as you must know the experiment using Nitrogen-14 and Nitrogen-15.
**RoRo**:
--- Quote from: Martin Luther King Jr on December 03, 2010, 05:48:17 am ---The evidence is not required. But you must only know that the DNA is actually the genetic material and not the protein.
The second one is essential as you must know the experiment using Nitrogen-14 and Nitrogen-15.
--- End quote ---
Okay, thank you very much!! :)
mdwael:
What the F**** does R-group mean, my stupid cie textbook keeps repeating this word in biological molecules without giving a definition of it, confusing me and not letting me understand anything!!! >:(
Master_Key:
--- Quote from: mdwael on December 03, 2010, 12:14:20 pm ---What the F**** does R-group mean, my stupid cie textbook keeps repeating this word in biological molecules without giving a definition of it, confusing me and not letting me understand anything!!! >:(
--- End quote ---
R-Groups are a specific groups in amino acids and they vary greatly between amino acids. For eg. Glycine would have different R-Group than Valine. You do not need to know the names R-Groups at A levels but you may find it if you are interested.
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