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Biology A2 Respiration

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Unit 4: Respiration


Point 1: What is metabolism

• This refers to the chemical reactions taking place in a C_____. • There are thousands of these occurring in each cell. • To make them easier to understand they are arranged into M__________ pathways. • Reactions releasing energy are C__________ reactions (e.g. respiration); those using energy are A__________ reactions (e.g. photosynthesis).

Point 2: How are respiration and photosynthesis linked?

1. Respiration is the R__________ of photosynthesis. 2. Respiration is an O__________ reaction whereas photosynthesis is a R___________ reaction, as shown here:


6CO2 + 6H2O + [Energy] C6H12O6 + 6O2 + [Energy]


What is oxidation and what is reduction?

Point 3: What is ATP?

• ATP consists of three P___________ groups, a R________ sugar and A____________. Draw a molecule of ATP in the space below:

• ATP provides the I______________ source of energy for biological reactions in all organisms, it is said to be U_____________. • When energy is released the body does not want to use it up all at once, otherwise it might lose a lot of it as ________. • Energy is released from the B_______ between the phosphate groups in a single H_____________ reaction. It can be released it in S_______, U___________ amounts. • Energy released can be used for processes such as A_______ T__________ and various metabolic reactions. • The P______________ from ATP can also be transferred to other molecules.

Point 4: The ATP cycle:

• When ATP is broken down, it is made up again straight away it is a R__________ reaction:

ATP ADP + Pi + 33kJ of energy...

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