Mitochondrial disorders tend to cause great fatigue because
A) nerve cells are filled with mitochondria.
B) muscle cells are normally filled with mitochondria.
C) affected cells do not use their mitochondrial DNA.
D) lysosomes dismantle the mitochondria in muscle cells.
B) muscle cells are normally filled with mitochondria.
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Approximately what percentage of our planet's land area is covered by crop and pasture lands?
A. 25% B. 5% C. 10% D. 50% E. 60%
When a neuron membrane potential becomes less negative, it is said to be ____
a. depolarized b. hyperpolarized c. repolarized d. damaged e. activated above the threshold potential
The various types of chlorophyll differ in the
A. amount of light they can absorb. B. amount of ATP they produce. C. number of electrons they release. D. amount of oxygen they utilize. E. wavelengths of light they absorb.
Why is potassium deficiency in plants most common on light, sandy soils?
A. plants grown in sandy soil don't require potassium B. potassium ions are too tightly bound to sand particles to be used by plants C. roots grown in sandy soil can't absorb potassium D. percolation of water through sandy soils leaches potassium from the soil