Cell A is a cube with sides of 2 micrometres and cell B is a cube with sides of 6 micrometres. How does the surface area to volume ratio of A compare with that of B?
Answer and explanation
Correct answer: B. A's ratio is three times greater than B's
- Step 1: For a cube of side L, SA : V = 6L^2 / L^3 = 6/L.
- Step 2: A: 6/2 = 3 per micrometre. B: 6/6 = 1 per micrometre.
- Step 3: A's ratio is 3 times B's.
Answer
three times greater.
Why not the others: The smaller cell has the larger ratio; nine uses the area scale factor; the ratios are not equal because the sizes differ.
Practise more Infectious and Non-infectious Disease and Cell Function.
Free questions with an explanation for every one, and full timed NSW HSC mock tests.
More Infectious and Non-infectious Disease and Cell Function questions
- Which pathogen is a misfolded protein that has no genetic material?
- Which sequence best describes Koch's postulates for showing that a microbe causes a disease?
- Ross River virus in Australia is spread to people mainly by:
- Phytophthora cinnamomi, which causes dieback in many Australian native plants, is a:
- Which of the following is part of the innate immune response?
- What is the function of a plasma cell?