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.
BIOLOGY COURSEWORK INVESTIGATION How does a change in temperature effect the activity of the catalase enzyme on a piece of liver? PLANNING Background knowledge An enzyme is a biological catalyst; it alters the rate of reaction without being changed itself.