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Name three modifiable and three non-modifiable risk factors of coronary artery disease.

Modifiable; SmokingObesity High cholesterol Non-modifiable; AgeGenderRace
HL
Answered by Hannah L. • Biology tutor
3809 Views

Describe the structure of proteins, and the bonds involved.

Proteins have three or four levels of structure, in increasing complexity. Primary structure is the sequence of amino acids that the protein is made up of; secondary structure is either alpha-helices or beta...
Answered by • Biology tutor
3322 Views

Describe the sequence of events that lead to the generation of an action potential

1 - Stimulus excites the neurone cell membrane, causing sodium ion channels to open, so sodium ions diffuse into the neurone, making it less negative. This depolarises the inside of the membrane.2 - Depolari...
MT
Answered by Matthew T. • Biology tutor
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Compare and contrast the structure of DNA and RNA (3 marks)

Similarities: - Both consist of a pentose sugar , a phosphate group and 4 nitrogenous bases. - Both are joined by covalent phosphodiester bonds between the phosphate and pentose sugar groups. Differences: - ...
AA
Answered by Anna A. • Biology tutor
19357 Views

Describe and explain how temperature affects the rate of an enzyme-controlled reaction?

Up to the optimum temperature (around 37 degrees Celsius) kinetic energy increases. So the likelihood of successful collisions between the active site of the enzyme and substrate increases. More enzyme subst...
EF
Answered by Enya F. • Biology tutor
6158 Views