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How is the content of Biology A-level examined in the 3 papers sat in June of A2?

Biology A-level is examined by year. Year 1 is examined in paper 1 and year 2 is examined in paper 2. Paper 3 consists of content from both years 1 and 2. When revising content for the papers it is imperativ...
MT
Answered by Mariam T. • Biology tutor
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Describe the process of atherosclerosis and the effect it has on the properties of the blood vessel

Atherosclerosis occurs when the endothelium of a blood vessel becomes damaged. This may due to various reasons such as high blood pressure or toxins from cigarette smoke. This causes an inflammatory response...
LT
Answered by Laura T. • Biology tutor
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Describe how vaccination can lead to protection against bacterial meningitis (6 marks)

Vaccines provide a dead/inactive form of bacterial meningitis. Phagocytes such as macrophages recognise the antigens of bacterial meningitis as foreign so engulf the pathogen forming a phagosome. The lysosom...
JH
Answered by James H. • Biology tutor
11233 Views

Explain the process of skeletal muscle contraction and why glucose is required for this process.

In skeletal muscle there exists a thick filament, myosin, and a thin filament, actin. For contraction both of these filaments need to interact causing a power stroke and muscle contraction. At rest, the myos...
SM
Answered by Shabri M. • Biology tutor
4191 Views

Describe the part played by each of the organelles involved in the production and secretion of the enzymes.

The Nucleus contains the DNA code for the amino acid sequence (2) 3. The Nucleolus makes rRNA (4) 5. The Ribosomes translate mRna in protein synthesis 6. The endoplasmic reticulum allows for the transport of...
AM
Answered by Aoife M. • Biology tutor
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