A Level Biology Practice Exam

Which term describes a strong attraction in biochemical contexts?

1. Affinity

2. Adhesion

3. Adaption

4. Activity

The correct answer is: Affinity

The term that describes a strong attraction in biochemical contexts is affinity. In biochemistry, affinity refers to the strength of the interaction between molecules, such as enzymes and substrates, or receptors and ligands. High affinity implies a strong attraction, meaning that the molecules are very likely to bind to each other, often leading to more efficient reactions and processes within biological systems. For example, an enzyme with high affinity for its substrate binds more effectively, which can enhance the rate of biochemical reactions. This concept is crucial in understanding various biochemical processes, including enzyme kinetics and signal transduction, where the strength of binding interactions can significantly affect physiological responses. The other terms presented do not convey the same concept of strong attraction: adhesion refers to the physical properties of molecules sticking to surfaces or each other, adaptation is about changes that organisms undergo to better fit their environment, and activity usually relates to the functional performance of a biological molecule but does not specifically pertain to attraction.