Qualification > Sciences
Edexcel BIOLOGY Doubts!!!!
~ Miss Relina ~:
Q 6 (b) in this exam do it tell me http://www.xtremepapers.net/Edexcel/Advanced%20Level/Biology/2005%20June/Unit%201%20June%2005.pdf
other question in this photo the darker part the cristea right ?
Amelia:
--- Quote from: Relina on April 02, 2011, 12:14:04 am ---oopps :-[ sorry formy careless
here its my dear :)
http://www.xtremepapers.net/Edexcel/Advanced%20Level/Biology/2004%20June/Unit%201%20June%2004%20MS.pdf
--- End quote ---
It's because the first two mRNA codons(a total of 6 bases) enters the ribosomes first. The first codon binds to tRNA molecule having the complementry anticodon & which is carrying the first aminoacid of the polypeptide being synthesised.. The second codon then also attracts a tRNA molecule showing the complementry molecule.
You have to write about atleast two tRNA's to show that you know how the translation takes place. ;)
Amelia:
--- Quote from: Relina on April 02, 2011, 12:25:22 pm ---Q 6 (b) in this exam do it tell me http://www.xtremepapers.net/Edexcel/Advanced%20Level/Biology/2005%20June/Unit%201%20June%2005.pdf
other question in this photo the darker part the cristea right ?
--- End quote ---
The infoldings of the mitochondria are the cristae. The 'dark' fluid like material is the matrix.
----------------------------------------------------
For question 6, I'm not at all sure. But anyways,
Take the two points of coincidents. (Start line of each scale and another point of coindents along the scales.)
Calculate the relationships between them.. On the scale shown there are four divisions on the stage micrometer and 10 divisions on the eyepiece graticule. Thus, 4/10 = 0.4 units. Each unit on the stage micrometer scale is 100 micrometers. Therefore, each division on the graticule scale will be 100 x 0.4 = 40 micrometers. The method is clearly shown here - http://www.xtremepapers.net/CIE/International%20A%20And%20AS%20Level/9700%20-%20Biology/9700_nos_ps_2.pdf
~ Miss Relina ~:
--- Quote from: Amelia on April 02, 2011, 04:07:37 pm ---The infoldings of the mitochondria are the cristae. The 'dark' fluid like material is the matrix.
----------------------------------------------------
For question 6, I'm not at all sure. But anyways,
Take the two points of coincidents. (Start line of each scale and another point of coindents along the scales.)
Calculate the relationships between them.. On the scale shown there are four divisions on the stage micrometer and 10 divisions on the eyepiece graticule. Thus, 4/10 = 0.4 units. Each unit on the stage micrometer scale is 100 micrometers. Therefore, each division on the graticule scale will be 100 x 0.4 = 40 micrometers. The method is clearly shown here - http://www.xtremepapers.net/CIE/International%20A%20And%20AS%20Level/9700%20-%20Biology/9700_nos_ps_2.pdf
--- End quote ---
Thanks my dear :D
Amelia:
--- Quote from: Relina on April 05, 2011, 01:23:40 pm ---Thanks my dear :D
--- End quote ---
Anytime :)
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