Question 1

What is cell doubling time?

Accepted Answer

Cell doubling time is the duration required for a viable population of cells to double in number during the logarithmic (exponential) growth phase of cell culture.

Question 2

What is the difference between doubling time and growth rate?

Accepted Answer

Doubling time (DT) is measured in units of time (hours or days), while the specific growth rate (μ) is the exponential rate constant per unit of time (hr⁻¹). They are inversely related by the equation DT = ln(2) / μ.

Question 3

Why does doubling time change across culture passages?

Accepted Answer

Primary mammalian cells experience progressive telomere shortening and cellular senescence (the Hayflick limit), lengthening doubling times over sequential passages. In contrast, transformed or immortalized cell lines maintain stable doubling kinetics.

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