What molecule is needed for photosynthesis to occur?

glucose

oxygen

nitrogen

carbon dioxide

Explain why phospholipid molecules form a bilayer. (3 marks)

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.

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell