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Biology
A Level

Name two features of plant cells that are not features of animal cells

Chloroplasts, a plastid which contains chlorophyll and in which photosynthesis takes place. A large/permanent vacuole. Cellulose/a cell wall. Plasmodesmata.

Answered by Fergus B. Biology tutor
2480 Views

Describe the stages of phagocytosis (4 marks)

Phagocytes (white blood cells) recognise pathogens via receptors and chemoattractionPhagocytes engulf the pathogen, forming an intracellular compartment called a phagosomeLysosomes fuse w...

Answered by Biology tutor
7463 Views

Why do the concentrations of Glycerate-3-phosphate in the chloroplast decreases after dark?

Glycerate-3-phosphate is a compound made during the calvin cycle in the leaf stroma. The calvin cycle is a light independent reaction, so continues when the light concentration decreases. To convert Glyce...

Answered by Biology tutor
10831 Views

How does allopatric speciation work?

Allopatric speciation occurs when the population of a species becomes divided and the two (or more) groups are isolated from one another. Different factors in the environment of each group will affect th...

Answered by Georgia W. Biology tutor
3088 Views

Explain why the binding of one oxygen molecule to haemoglobin makes it easier for a second molecule of oxygen to bind.

The binding of the first oxygen molecule changes the tertiary and therefor the quaternary structure of the haemoglobin molecule, therefore exposing another binding site making is easier for the second mol...

Answered by Biology tutor
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