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Explain the process of evolution?

Evolution occurs via a process called natural selection,Natural selection (termed survival of the fittest by Darwin) is where organisms that are better adapted to an environment survive and reproduce. The...

Answered by Stella W. • Biology tutor

2844 Views

Maltose is hydrolysed by the enzyme maltase. Explain why maltase catalyses only this reaction (3 marks)

The question is three marks, so should have three points.1) Active site of the enzyme has a specific shape/ tertiary structure/ complementary to maltose2) Only maltose can bind...

Answered by Amy W. • Biology tutor

2721 Views

Explain the similarities and differences between plant and animal cells structure and shape (may include use of a diagram and bullet points are accepted).

The similarities are:Cell cytoplasmNucleusCell membraneMitochondriaRibosomesStructures unique to plant cells (with a few exceptions):ChloroplastsCell wallsLarge permanent vacuoleAnimal cells tend to be va...

Answered by Jessica L. • Biology tutor

4001 Views

Describe the development and propagation of an action potential in response to a stimulus (6 marks)

1. stimulus excites membrane so Na⁺channels open, membrane becomes more permeable to Na⁺ so Na⁺diffuse into neurone down electrochemical gradient. Inside ...

Answered by Simmy W. • Biology tutor

2694 Views

Describe the relationship between different hormones regulating the menstrual cycle?

There are 4 main hormones regulating the menstrual cycle. We can split them into 2 groups: FSH (follicle stimulating hormone) and LH (luteinising hormone) made by the pit...

Answered by Valeriya K. • Biology tutor

3363 Views