Multiple Choice Quiz - OCR A Biochemistry
Practising recall and doing questions is so important for long term retention of information. Try this self marked quiz. OCR A Biochemistry.
Practising recall is so important for retention and learning. Try this quiz without books first !
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Multiple Choice Quiz - OCR A DNA and Protein Synthesis
Practising recall and doing questions is so important for long term retention of information. Try this self marked quiz. OCR A DNA and Protein Synthesis
Practising recall is so important for retention and learning. Try this quiz without books first !
Try this quiz - if you found it useful then please ❤️
Enzymes - Test your Understanding
Multiple choice questions on enzymes, all past paper questions, a good way to assess your understanding
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Protein Synthesis - Resources, Questions and a Quiz
Protein Synthesis - exam questions a quiz and powerpoints, videos and animations, please like and share
Videos, powerpoints, animation and notes for understanding protein synthesis in A level Biology. A pack of questions and an automarked quiz.
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Tips for Understanding Protein Synthesis
DO
Distinguish between Triplet, Codon, Anticodon
Know what RNA polymerase does
Understand how tRNA achieves translation
Mention ATP and what it is used for
remember that rRNA is made in the nucleolus
Refer to START and STOP codons
DONT
Say DNA is turned into mRNA
Say Thymine becomes Uracil
Say Amino acids are “joined together”
Here are lots of other excellent resources to help you improve
You could join other motivated U6th students in the group tutor sessions - twice a month
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Enzymes - Questions (and answers) - for A-level Biology - With Videos and Powerpoints to help recap the theory
Enzymes - Questions (and answers) - for A-level Biology - With Videos and Powerpoints to help recap the theory.
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Watch the video - and then - try these questions - from OCR A and B spec - but relevant to all UK boards.
Respiration and Enzymes/Protein structure ... Hard Synoptic A-level Biology Question
This is an outstanding synoptic question from a Pre-U Biology Paper. Covers Protein Synthesis, Enzymes, Heart Disease, Respiration ....
Vaccines, Plasmids and Monkeys... More Synoptic Questions - A-level Biology #ocr #eduqas
From an Old OCR Unifying concepts paper. ....
Don't panic, the question is not about DNA vaccines or plasmids.
The question is about differences between protein and DNA structure, protein synthesis, post translational modification of protein, clonal selection, mutation of pathogens. All of which are on the specification.
From an Old OCR Unifying concepts paper. ....
Don't panic, the question is not about DNA vaccines or plasmids.
The question is about differences between protein and DNA structure, protein synthesis, post translational modification of protein, clonal selection, mutation of pathogens. All of which are on the specification.
Read the scaffolding of the question with great care
No, no, no ! Quickly addressing (very) common Enzyme mistakes - A-level Biology #eduqas #OCR
Enzymes have an active site - Substrates don't.
The substrate is a complementary shape to the active site NOT the "same shape"
Enzymes reduce the activation energy for a reaction to occur
Anabolism is making, Catabolism is breaking
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Enzymes have an active site - Substrates don't.
The substrate is a complementary shape to the active site NOT the "same shape"
Enzymes reduce the activation energy for a reaction to occur
Anabolism is making, Catabolism is breaking
Increasing temperature increases the kinetic energy of everything...substrate, enzyme, atoms that make up the enzyme.
Enzymes are proteins with a delicate tertiary structure whose shape is the resultant of all of the interactions between the amino acids. Some of the interactions are weak bonds which are broken by altering the environment (ph/temperature) of the amino acids.
4 variables control an enzyme experiment - Temperature of the solution, pH of the solution, Enzyme concentration, Substrate concentration. If one is the independent variable - the others MUST be controlled variables. Change one, keep the others the same.
Rate is 1/t where t is the time taken for something to happen, use seconds, never minutes.
You always plot INITIAL rate of reaction because as soon as you add the enzyme to the substrate, the substrate concentration will fall - because it is being turning into product.
pH is a logarithmic scale - pH 4 is 10x more acid than pH 5 and 100x more acid than pH 6, therefore what appears to be a small change in pH is a big change in the number of Hydrogen ions present.
"It is denatured" is not an explanation, you must explain the changes that occur in the enzyme as a result of temperature or pH and the consequences of the changes to the active site and why this prevents catalysis.
The optimum temperature for an enzyme will differ according to the environment in which the organism has evolved to live. What is optimal for an arctic fish will be very different from a bacteria in a hot spring in Yellowstone park.
When explaining enzyme graphs look at the axes, and then look at them again. Then repeat. DO NOT ASSUME YOU ARE LOOKING AT A RATE GRAPH. When explaining graphs, refer to the changes in the dependent variable - don't just say rate.
Competitive inhibitors have part of the molecule which is complementary to part of the active site.
Non competitive inhibitors reduce the concentration of working enzymes.
Hope this has helped a little - if there are any that you would like to add then please drop me a line.
This is an outstanding synoptic question from a Pre-U Biology Paper. Covers Protein Synthesis, Enzymes, Heart Disease, Respiration ....