1.1 Cell structure

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Question 27
Medium

In sexual reproduction, a zygote (a single fertilised egg cell) divides repeatedly by mitosis to form an embryo.

a.

How many cells are there in the embryo after 444 successive cell divisions?

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b.

A micrograph of a spherical multi-celled human embryo. A vertical double-headed arrow spanning the outer boundaries of the embryo is labelled D.

The image diameter DDD of the embryo shown above is measured as 48 mm48\text{ mm}48 mm. The actual (real) diameter of this embryo is 120 μm120\ \mu\text{m}120 μm.

Calculate the magnification of the image. Use the formula: magnification=image sizereal size\text{magnification} = \frac{\text{image size}}{\text{real size}}magnification=real sizeimage size​ Remember that 1 mm=1000 μm1\text{ mm} = 1000\ \mu\text{m}1 mm=1000 μm.

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1.1 Cell structure Questions

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