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GCSE

Explain how a mutation in DNA could cause a non functioning enzyme to be formed

A mutation could change the order of DNA bases which would alter the type of amino acid produced from a DNA triplet. Therefore, the enzyme, which is a pr...

Answered by Hannah W. • Biology tutor

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Describe the pathway of an electrical signal in producing a response to a stimulus

Stimulus is detected by a recepttor e.g. the skin- Electrical signals travel from receptor to Central nervous System (CNS) via sensory neurones- CNS coordinates a response to the stimuli- CNS sends ...

Answered by Aleena A. • Biology tutor

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1a) Give 3 structures that an animal cell would contain and describe their function? 1b) Name 3 different structures that a plant cell contains which an animal cell would not.

1a) Nucleus: Contains the genetic material of the cellCell membrane: controls what can enter and leave the cell. Also will hold the cell togetherCytoplasm: Where cell reactions take place

1b) C...

Answered by Aleena A. • Biology tutor

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What is homeostasis?

Homeostasis can be defined as the maintenance of a constant internal environment despite various stresses in the external environment which may act to alter this stable state. The stable state that the bo...

Answered by Emma B. • Biology tutor

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How do I test for the presence of starch in food?

The iodine test - use a dropper to apply a little iodine onto a small sample of the food. If starch is present, the iodine will change colour from orange/brown to blue/black.

Answered by Anastasia P. • Biology tutor

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