Top answers


Discuss the negative effects of smoking in the human body (6).

Smoking can cause carbon monoxide poisoning, meaning that carbon monoxide is carried in the blood via red blood cells instead of oxygen, leading to fatigue. Smoking can also cause lung cancer, as it contains...
SW
Answered by Samodani W. Biology tutor
3116 Views

Formation of an enzyme-substrate complex increases the rate of reaction, explain how.

The formation of an enzyme substrate complex reduces the activation energy required for the reaction to take place by bending bonds. Without an enzyme, very few reactions would have the energy to take place.
Answered by Biology tutor
13171 Views

Describe how blood moves around the heart

De-oxygenated blood enters the right atrium from the Vena Cava, it then passes into the right ventricle due to gravity and the contraction of the walls of the right atrium. The walls of the right ventricle t...
IL
Answered by Isobel L. Biology tutor
3224 Views

State and explain the principles of the Polymerase Chain Reaction (PCR)

Firstly, PCR is used to amplify DNA so that it can be used in analysis. It is particularly useful in processes like forensic science to identify DNA samples left behind at a crime scene. The process begins w...
VP
3939 Views

What is the role of the vacuole in the plant cell?

Vacuole is a membrane-bounded structure, which is compartmentalised. It stores both organic as well as inorganic molecules along with water to support the organelles. In case of osmosis it can release the wa...
MH
6916 Views