I've noticed that certain types of questions in AQA specification section 3.4.1 (DNA, Genes and Chromosomes) consistently challenge students. Understanding these patterns and knowing how to approach them can significantly boost your exam performance. Let me walk you through four of the most commonly asked question types, using actual AQA examples, and show you exactly how to earn those crucial marks.

This article is for anyone who is totally confused by mitosis, or who hasn’t yet started the topic.

Mitosis is part of cell division. It explains how multicellular organisms grow and is vital for understanding the challenging topic of autosomal linkage. Mitosis is also similar to the first half of meiosis; learning mitosis first will make meiosis much easier to understand.

Remember that for A level biology, you always need to understand why, as well as how. So, get a strong grip of the fundamental concept of mitosis before you try to memorise the details. Understanding the purpose of mitosis will also make it a lot easier to remember the individual stages of the process.

3.1.5 - Nucleic Acids Structure and Replication

Can you

• Draw the formation and hydrolysis of a phosphodiester bond

• Name the parts of a nucleotide

• Explain the similarities and differences between RNA and DNA

• Explain why DNA is a good molecule for storing information ?

• Can you describe semi-conservative replication ?

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

Nucleotide structure and DNA replication, useful resources, animations, powerpoints and exam questions. Meselson and Stahl experiments….

Protein Synthesis - exam questions a quiz and powerpoints, videos and animations, please like and share

Seems to be a huge challenge for some students

Try using this animation and this one and an excellent set of interviews

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Another from the past.

Terrific question about DNA, diffusion, ATP production and fireflies going out in a blaze of glory....

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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.