12 Jun Describe the best environment for the enzyme pepsin
Question
Water and Life
The human body is about 70% water (not counting the water in body fat, which varies from person to
person). The body needs all this water to function normally. Just why is so much water required by human
beings and other organisms? Water can dissolve many substances that organisms need, and it is necessary
for many biochemical reactions. The examples below are among the most important biochemical processes
that occur in living things, but they are just two of many ways that water is involved in biochemical
reactions.
• Photosynthesis — In this process, cells use the energy in sunlight to change carbon dioxide and water
to glucose and oxygen. The reactions of photosynthesis can be represented by the chemical equation
6CO2 + 6H2O + Energy ? C6H12O6 + 6O2
• Cellular respiration — In this process, cells break down glucose in the presence of oxygen and release
carbon dioxide, water, and energy. The reactions of cellular respiration can be represented by the
chemical equation
C6H12O6 + 6O2 ? 6CO2 + 6H2O + Energy
Water is involved in many other biochemical reactions. As a result, just about all life processes depend on
water. Clearly, life as we know it could not exist without water.
Questions
1. Describe the best environment for the enzyme pepsin.
2. Why is water so important for life?
3. Which is a stronger acid: lemon juice or soda pop? Why?
4. What is a hydronium ion? How does one form?
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