9th - Final Exam 2024

Front

What is the role of an enzyme in a chemical reaction?

Back

An enzyme speeds up a reaction by lowering the activation energy.

Front

What is the function of the cytoplasm in a cell?

Back

The cytoplasm is the jelly-like substance that fills the cell and holds organelles in place.

Front

What gas protects the Earth from harmful radiation?

Back

Ozone (O3) protects the Earth from harmful radiation from the sun.

Front

What is the greenhouse effect?

Back

The greenhouse effect is the process by which much of the sun's heat is trapped in the atmosphere, warming the planet.

Front

What factors affect enzyme activity?

Back

Enzyme activity is affected by pH and temperature.

Front

Define activation energy.

Back

Activation energy is the minimum energy required for a chemical reaction to occur.

Front

What is the function of the nucleus in a cell?

Back

The nucleus contains the cell's genetic material and controls its activities.

Front

What is the significance of the ozone layer?

Back

The ozone layer protects living organisms from harmful ultraviolet (UV) radiation.

Front

Explain the term 'substrate' in relation to enzymes.

Back

A substrate is the reactant molecule upon which an enzyme acts.

Front

What happens to enzymes at extreme pH levels?

Back

Extreme pH levels can denature enzymes, altering their shape and function.