Practise MYP Biology questions on 3 Metabolism and review the explanations to check your understanding.
Use these questions for topic practice and to find ideas you want to revisit in your notes or lessons.
Which feature distinguishes a chemical equation from a word equation?
When an enzyme provides an "alternative reaction pathway" for a biochemical reaction, how does this mechanism specifically contribute to a faster reaction rate?
True or False: Breaking a chemical bond in a reactant molecule is an endothermic process that requires an input of energy.
True or False: A reaction that releases a very large amount of total energy will always happen faster than a reaction that releases a small amount of energy.
An enzyme is defined as a catalyst because it speeds up a reaction and emerges from the process __________.
It uses symbols and formulas to show how atoms rearrange
It represents the reaction as a narrative description
It lists only the final products of a long metabolic pathway
It includes the names of specific enzymes involved
It involves a different sequence of molecular interactions that requires less activation energy () to reach the transition state.
It increases the internal energy of the substrate molecules until they match the original activation energy requirement.
It alters the chemical nature of the products so that they are at a lower energy level than the reactants.
It eliminates the need for the reactants to reach a transition state before becoming products.
True
False
True
False
as a part of the product
chemically changed
chemically unchanged
completely denatured
