Electron microscopes have higher resolution because
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During contraction, which stays the same length?
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Calcium ions start contraction by binding to
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ATP is needed in the cross-bridge cycle to
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Calcium ions are stored in the
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A myofibril is 1.0 cm long; each sarcomere is 2.5 µm. How many sarcomeres are in it?
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A plant cell has ψs = −800 kPa and ψp = +300 kPa. Calculate its water potential (kPa).
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Water moves between cells with ψ = −300 kPa (X) and ψ = −600 kPa (Y). It moves
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Active transport differs from facilitated diffusion because it
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Glucose absorption in the ileum by co-transport depends on
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The resting potential is maintained partly by
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Saltatory conduction is faster because
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An impulse travels 0.60 m at 30 m s⁻¹. Calculate the time taken (ms).
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To compare the means of two groups, use
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To test whether observed genetic ratios fit expected ratios, use
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How many degrees of freedom for a t-test with two groups of 10?
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If the calculated t value is greater than the critical value at p = 0.05,
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Sclerenchyma fibres are strong because they have
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Amyloplasts store
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Magnesium ions are needed by plants to make
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