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Why is acetyl Coenzyme A, an important molecule in cellular respiration? (2 marks)

NB:include intext referencing


ATP is produced during cellular respiration.However, it is also required.Explain.

(4 marks)

NB:Use intext Havard referencing


.The human hemoglobin is a tetrameric protein of about 64.5 KDa, consisting of two α


chains andtwo β-chains tightly bound.


d)Find the length of the tetrameric proteinhemoglobinassuming its all an alpha


a)Calculate the number of amino acids present in the αchains


b)What is the length of each β-chain?


c)What is thesum of thelengthof the two α-chains?


helical structure.

Draw the chemical structure of cholesterol and state its functions


Briefly explain why Sodium ions have a charge of 1+

(2 marks)


Draw the electron distribution diagram of the atoms of the element in group 17 period 3.

(4 marks)


The human hemoglobin is a tetrameric protein of about 64.5 KDa, consisting of two α-


chains and two β-chains tightly bound.


a) Calculate the number of amino acids present in the α-chains


b) What is the length of each β-chain?


c) What is the sum of the length of the two α-chains?


d) Find the length of the tetrameric protein hemoglobin assuming its all an alpha


helical structure.

Study the polypeptide structure sequence of a β-strand shown below



Lys-Gly-Asp-Trp-Ser-Glu



a) Draw the chemical structure of the polypeptide. Indicate on the structure the



backbone and peptide bonds



b) Calculate the weight of the protein in KDa



c) Calculate the length of the protein.

In Calvin cycle: C-3 cycle,


If Fructose-6-phosphate &

Glyceraledehyde-3-phosphate are being used to make the Erithrose-4-phosphate & Xylulose-5-phosphate..


And if in this process, they ( Fructose-6-phosphate & Glyceraledehyde-3-phosphate ) are using all of their carbons (6+3) , then where is this glucose coming from?


what organism does not have any of the distinguishing characterists



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