Cell Processes Mastery
Test your understanding of core cell processes in NCEA Level 2 Biology.
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Quiz Questions & Answers
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Question 1: Why do cells use enzymes?
To make cell walls stronger
To provide stored energy for the cell
To move molecules against a gradient
To speed up reactions by lowering activation energy
Question 2: What happens if an enzyme is denatured?
It turns into a carbohydrate
It gains more energy to work faster
It always becomes more stable
Its active site changes shape and the substrate fits less well
Question 3: Which change would usually increase enzyme activity most directly?
Adding more product to the reaction
Raising temperature to the optimum range
Lowering pH far below the optimum
Removing all substrate
Question 4: How does photosynthesis mainly support plant growth?
It breaks down glucose to release carbon dioxide
It makes glucose for respiration and building biomass
It removes oxygen so cells can divide
It directly creates proteins from sunlight
Question 5: Which condition is most likely to limit photosynthesis in low light?
Chlorophyll always stopping completely
Roots receiving too much glucose
Light intensity
Water turning into oxygen too quickly
Question 6: What is the key difference between diffusion and active transport?
Active transport only moves water
Diffusion always needs ATP
Active transport uses energy to move substances against a gradient
Diffusion only happens in animals
Question 7: What happens to a red blood cell in pure water?
Water leaves the cell and it shrinks
The cell uses ATP to pump out all water
Water moves into the cell and it may burst
Nothing changes because water cannot cross membranes
Question 8: Why do cells need both respiration and photosynthesis in ecosystems?
Only photosynthesis produces any usable energy
Only animals use respiration, so plants do not need it
They are identical processes with different names
They cycle energy and matter between producers and consumers