Which of the following is a physical change? Select one: a. solid dry ice changing to a gas b. digesting a meal c. baking a cake d. fermenting grapes to produce wine e. a tomato ripening

What are the four basic classes of organic molecules how do they differ structurally and functionally

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

Asolution of an enzyme and a substrate was placed in a water bath and the temperature of the reaction was raised gradually. the graph shown was plotted at the end of the experiment. what can be concluded from the graph? a) temperature has no effect on the activity of the enzyme. b) the effect of temperature on the enzyme is unpredictable. c) the enzyme shows increased activity up to a certain temperature. d) the activity of the enzyme is inversely proportional to the temperature.