Pi bonds Study guides, Class notes & Summaries
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Edexcel a level biology paper 2 mark scheme june 2023
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Question 
Number 
Answer Mark 
1(a)(i) The only correct answer is B (X) 
A is incorrect as W is not found in a disaccharide 
C is incorrect as Y is not found in disaccharide 
D is incorrect as Z is not found in disaccharide 
 1 
Question 
Number 
Answer Mark 
1(a)(ii) The only correct answer is B (V and Z) 
A is incorrect as X is not found in proteins 
C is incorrect as W is not found in proteins 
D is incorrect as W s not found in proteins 
 1 
Question 
Number 
Answer Mark 
1(a)(iii) The only ...
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BIOCHEM ACS STUDY GUIDE QUESTIONS AND ANSWERS 2024.
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BIOCHEM ACS STUDY GUIDE QUESTIONS AND ANSWERS 2024. 
Each of the following subcellular structures contains DNA EXCEPT 
A. the nucleus. 
B. ribosomes. 
C. chloroplasts. 
D. mitochondria. - ANSWER- B 
In plant and animal cells, the three-dimensional integrity of the cell 
is maintained, in part, by an internal network of filaments called 
A. the cell wall. 
B. the Golgi apparatus. 
C. the cytoskeleton. 
D. the endoplasmic reticulum. - ANSWER- C 
Of the following, which are prokaryotes? 
A. viruses...
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ACS BIOCHEMISTRY EXAM QUESTION WITH COMPLETE SOLUTIONS LATEST 2024.
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ACS BIOCHEMISTRY EXAM QUESTION WITH COMPLETE SOLUTIONS LATEST 2024. 
Henderson-Hasselbach Equation - CORRECT ANSWER - pH = pKa + log ([A-] / [HA]) 
FMOC Chemical Synthesis - CORRECT ANSWER - Used in synthesis of a growing 
amino acid chain to a polystyrene bead. FMOC is used as a protecting group on the Nterminus. 
Salting Out (Purification) - CORRECT ANSWER - Changes soluble protein to solid 
precipitate. Protein precipitates when the charges on the protein match the charges in 
the solution. 
...
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ACS BIOCHEMISTRY EXAM QUESTION WITH COMPLETE SOLUTIONS LATEST 2024.
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ACS BIOCHEMISTRY EXAM QUESTION WITH COMPLETE SOLUTIONS LATEST 2024. 
 
Henderson-Hasselbach Equation - CORRECT ANSWER - pH = pKa + log ([A-] / [HA]) 
FMOC Chemical Synthesis - CORRECT ANSWER - Used in synthesis of a growing 
amino acid chain to a polystyrene bead. FMOC is used as a protecting group on the Nterminus. 
Salting Out (Purification) - CORRECT ANSWER - Changes soluble protein to solid 
precipitate. Protein precipitates when the charges on the protein match the charges in 
the solution....
![BIO 441A EXAM 3 STUDY GUIDE WITH COMPLETE SOLUTION.](/docpics/5124921/662d4b70ee5de_5124921_121_171.jpeg)
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BIO 441A EXAM 3 STUDY GUIDE WITH COMPLETE SOLUTION.
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BIO 441A EXAM 3 STUDY GUIDE WITH COMPLETE SOLUTION. 
LECTURE ONE - METABOLISM INTRODUCTION 
● Autotrophs synthesize all their own cellular constituents from simple molecules 
● Heterotrophs obtain energy through oxidation of organic compounds and therefore rely 
on autotrophs 
● Metabolism involves many reactions such as 
○ Glycolysis/gluconeogenesis 
○ The citric acid cycle 
○ Oxidative phosphorylation 
● Catabolism is the degradation of biomolecules 
○ Energy rich nutrients are...
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BIOCHEM ACS STUDY GUIDE
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BIOCHEM ACS STUDY GUIDE 
 
Each of the following subcellular structures contains DNA EXCEPT 
 
A. the nucleus. 
B. ribosomes. 
C. chloroplasts. 
D. mitochondria. - B 
 
In plant and animal cells, the three-dimensional integrity of the cell 
is maintained, in part, by an internal network of filaments called 
A. the cell wall. 
B. the Golgi apparatus. 
C. the cytoskeleton. 
D. the endoplasmic reticulum. - C 
 
Of the following, which are prokaryotes? 
 
A. viruses 
B. bacteria 
C. yeast 
D. plant ...
![BIOCHEM ACS STUDY GUIDE QUESTIONS AND ANSWERS 2024.](/docpics/4605730/65dcbc5179aa1_4605730_121_171.jpeg)
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BIOCHEM ACS STUDY GUIDE QUESTIONS AND ANSWERS 2024.
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BIOCHEM ACS STUDY GUIDE QUESTIONS AND ANSWERS 2024. 
Each of the following subcellular structures contains DNA EXCEPT 
A. the nucleus. 
B. ribosomes. 
C. chloroplasts. 
D. mitochondria. - ANSWER- B 
In plant and animal cells, the three-dimensional integrity of the cell 
is maintained, in part, by an internal network of filaments called 
A. the cell wall. 
B. the Golgi apparatus. 
C. the cytoskeleton. 
D. the endoplasmic reticulum. - ANSWER- C 
Of the following, which are prokaryotes? 
A. viruses...
![Chemistry 112 ACS Exam 69 Questions with Verified Answers,100% CORRECT](/docpics/5592686/6665f68d33e4e_5592686_121_171.jpeg)
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Chemistry 112 ACS Exam 69 Questions with Verified Answers,100% CORRECT
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Chemistry 112 ACS Exam 69 Questions with Verified Answers 
 
Energy (decreases/increases) with increasing wavelength? - CORRECT ANSWER decreases 
 
Energy (decreases/increases) with increasing frequency? - CORRECT ANSWER increases 
 
The energy gaps between levels (decrease/increase) as the energy levels increase (n=1 to n=2 to n=3, etc.) - CORRECT ANSWER decreases 
 
The O-Si-O bond angles in SiO₂ (quartz) are closest to... - CORRECT ANSWER 110° 
 
A molecule with 0 lone pairs and 2 bonding ...
![BIO 441A EXAM 3 STUDY GUIDE WITH COMPLETE SOLUTION.](/docpics/5123622/662d2bd012e12_5123622_121_171.jpeg)
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BIO 441A EXAM 3 STUDY GUIDE WITH COMPLETE SOLUTION.
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BIO 441A EXAM 3 STUDY GUIDE WITH COMPLETE SOLUTION. 
LECTURE ONE - METABOLISM INTRODUCTION 
● Autotrophs synthesize all their own cellular constituents from simple molecules 
● Heterotrophs obtain energy through oxidation of organic compounds and therefore rely 
on autotrophs 
● Metabolism involves many reactions such as 
○ Glycolysis/gluconeogenesis 
○ The citric acid cycle 
○ Oxidative phosphorylation 
● Catabolism is the degradation of biomolecules 
○ Energy rich nutrients are...
![Chem 162 (100% Errorless Answers)](/docpics/3737749/654146e8deda3_3737749_121_171.jpeg)
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Chem 162 (100% Errorless Answers)
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Axial lone pairs correct answers Lies on axis of molecule where is srongly repels the electron pairs in the three equatorial bones 
 
Equatorial lone pair correct answers Lies on molecule's equator, where is strongly repels electron pairs in the two axial bonds 
 
sigma bond correct answers all single covalent bonds. A bond formed when two atomic orbitals combine to form a molecular orbital that is cylindrically symmetrical around the axis connecting the two atomic nuclei 
Head on overlap of hy...
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