Describe active transport
Active transport is the movement of a substance against its concentration gradient across a selectively permeable membrane. In order for an organism to carry out active transport energy is required to overcome the energy barrier posed by the concentration gradient that wants to move the substance in the opposite direction along its concentration gradient, energy is provided in the form of ATP.
AH
Related Biology GCSE answers
All answers ▸a) What is the function of the atrioventricular valves? b) When the ventricles are contracting, are the arterioventricular valves open or closed? c) Explain why the muscle walls of the atria are thinner than the walls of the ventricles.
Describe the key features of a velocity-time graph?
How do you calculate the magnification of an image? For example, if the real size of a cell is 30um and the size of the cell in the textbook is 60mm, what is the magnification?
Compare Anaerobic respiration in a yeast and muscle cell