Top answers

How does vaccination confer immunity to a person?

The dead or inactive form of the pathogen stimulates the adaptive immune system. It forces white blood cells to form antibodies against the pathogen, so that if a future invasion by the same pathogen was to ...
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Answered by Anushka J. • Biology tutor
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Q4: Some small organisms do not have a specialised gas exchange system like humans. Instead they absorb oxygen through their skin. What is this process called? • Transpiration • Respiration • Diffusion • Photosynthesis

The answer is Diffusion. This is random movement of a substance from an area of high concentration (the air) to a region of low concentration (inside the organism). In this case, the substance diffusing woul...
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Answered by Rebecca T. • Biology tutor
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How do prokaryotes differ from eukaryotes?

Prokaryotes are single-celled organisms (e.g. bacteria) which lack any membrane bound organelles. Thus, they are anuclear (have no nucleus) and their DNA is circular and found in the nucleoid area of the pro...
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Answered by Aneesa P. • Biology tutor
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Explain the process and mechanisms underpinning gas exchange in animal bodies.

The process responsible for gas exchange in animals is diffusion. Air, containing oxygen needed for cellular respiration, is inspired in fills the lungs. The high concentration of oxygen in the lung creates ...
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Answered by Eoin B. • Biology tutor
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Name the enzyme present in the saliva and what is its role in digestion

Saliva contains salivary amylase which digest some carbohydrates in mouth
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Answered by Sonali M. • Biology tutor
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