Which statement best describes the relationship between a dependent variable and an independent variable in a scientific investigation?
O The independent variable changes in response to changes in the dependent variable.
O The dependent variable changes in response to changes in the independent variable.
O The dependent variable and the independent variable each change separately due to controls.
O Both the independent variable and the dependent variable are controlled by the experimenter
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lysosomes contain a variety of enzymes, enabling the cell to break down various biomolecules it engulfs, including peptides, nucleic acids, carbohydrates, and lipids (lysosomal lipase). the enzymes responsible for this hydrolysis require an acidic environment for optimal activity. hope i !

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many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.