Mass per volume
Before you read
Test yourself first: 5 questions
Question 1 of 5
Which best describes 'density'?
Answer: B. Density is mass per unit volume (mass ÷ volume).
Question 2 of 5
Antibodies are proteins produced to target specific:
Answer: B. Antibodies bind to specific antigens (markers on pathogens) to neutralize or flag them for destruction.
Question 3 of 5
Which type of white blood cell produces antibodies?
Answer: B. Lymphocytes (specifically B cells) produce antibodies against specific pathogens.
Question 4 of 5
Density is calculated as mass divided by:
Answer: B. Density = mass ÷ volume, describing how much matter is packed into a given space.
Question 5 of 5
In the 'lock-and-key' model, an enzyme's shape must match its:
Answer: B. An enzyme's active site fits a specific substrate, like a key in a lock.
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