Top answers

Explain the diffusion process of gas exchange in the lung during respiration

Oxygen and carbon dioxide, dissolved in water, are exchanged by diffusion in the lungs. Blood travelling to the lungs is deoxygenated and instead of oxygen, carbon dioxide is bound to the red blood cells. Th...
CR
Answered by Calum R. • Biology tutor
13923 Views

What are the stages of mitosis?

Prophase - everything in the cell duplicates, and the chromosomes condense Metaphase - chromosomes align in the middle of the cell and spindle fibres attach to the centromere (part holding the two sister chr...
AM
Answered by Anya M. • Biology tutor
2994 Views

Describe how the origin of living systems is explained by natural processes. Please provide supporting evidence for hypotheses.

Numerous experimental investigations have been conducted to explain the diversity and unity of life. Specifically, these models have aimed to provide evidence that the conditions of early Earth provided an e...
RS
Answered by Ruth S. • Biology tutor
2926 Views

Explain how ATP is produced through chemiosmosis during respiration.

First, it is important to note that a concentration gradient of H + ions is generated between the matrix of the mitochrondria and the inter-membrane space. This is because H + ion pumps pump H + ions from th...
PS
Answered by Pratyusha S. • Biology tutor
17056 Views

What is the sliding filament mechanism?

The sliding filament mechanism is a model used to show the way in which muscles contract. It involved 3 components - Myosin, Actin and Tropomyosin. Myosin has a head like projection to which an ADP molecule ...
JC
Answered by Joseph C. • Biology tutor
12798 Views