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Which of the following cellular transport processes requires the greatest expenditure of cellular energy?


A) diffusion
B) osmosis
C) active transport
D) dialysis
E) passive transport

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Adrenoleukodystrophy is an inborn error of metabolism that causes brain degeneration starting at age 5 or 6.The defect is in peroxisomes,organelles that


A) contain DNA.
B) enable a cell to extract energy from nutrient molecules.
C) enable a cell to move.
D) house several types of enzymes.
E) store fat.

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Two functions of the cell membrane are


A) housing the DNA and accessing the DNA.
B) enabling the cell to communicate with and attach to other cells.
C) to produce and break down secretions.
D) to provide cellular energy and to produce mitochondria.
E) to move the cell and help it to divide.

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Mitochondria


A) manufacture protein.
B) release energy from glucose molecules.
C) digest lipid molecules.
D) are in the nucleus.
E) can substitute for nuclei.

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Cells in different tissues vary considerably.Which of the following determines a cell's specialized function?


A) the number of cells of that type
B) size
C) shape
D) which genes it uses
E) the requirements of the body in a particular situation

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