A keyboard is also used to give commands to the operating system of a computer, such as Windows ' Control-Alt-Delete combination, which brings up a task window or shuts down the machine. A command-line interface is a type of user interface operated entirely through a keyboard, or another device doing the job of one.
How Temperature Affects Enzymes. Higher temperatures tend to speed up the effect of enzyme activity, while lower temperatures decrease the rate of an enzyme reaction. At higher temperatures, more molecules collide, increasing the chance that an enzyme will collide with its substrate.
1 As the enzyme molecules become saturated with substrate, this increase in reaction rate levels off. 2  The rate of an enzyme-catalyzed reaction increases with an increase in the concentration of an enzyme. 3  At low temperatures, an increase in temperature increases the rate of an enzyme-catalyzed reaction. At low temperatures, an increase in temperature increases the rate of an enzyme-catalyzed reaction. 2  At higher temperatures, the protein is denatured, and the rate of the reaction dramatically decreases. 3  An enzyme has an optimum pH range in which it exhibits maximum activity.