Exam 6: Energy Flow in the Life of a Cell

Preservatives such as citric acid are added to foods to interfere with bacterial growth. This creates an acidic pH in the food. Why does this affect the bacteria that are present?

Imagine you are conducting an experiment on a yeast enzyme known as sucrase. This enzyme is used by yeast cells to break down sucrose into glucose and fructose. What type of reaction is this?

Kinetic energy is like sitting at the top of a hill, and potential energy is like coasting down that hill on your bike. True or False?

A "high-energy" bond in an ATP molecule is located between:

What is a simple definition of energy, from a biological perspective? Give some examples of how energy is used in a cell.

The burning of sugar is an example of an endergonic reaction, and photosynthesis is an example of an exergonic reaction. True or False?

Most reactions in the body occur too slowly to sustain life. This is because:

The photosynthetic reaction is considered to be an endergonic reaction. True or False?

Sulfa antibiotics damage bacteria by affecting a certain bacterial enzyme. The sulfa antibiotic looks similar to a substrate normally required by the bacterial cells to live. The sulfa antibiotic occupies the active site of the required enzyme and blocks entry of its normal substrate. This prevents the bacteria from making nucleotides that are required for their reproduction and survival. Based on this information, the action of sulfa antibiotics is an example of:

Activation energy is necessary for all ________ reactions.

In cells, endergonic reactions are often coupled with enzymatic reactions that store energy. True or False?

Animals have enzymes that break apart starch molecules but not cellulose, despite the fact that both are made up of glucose subunits. Which enzyme characteristic BEST explains this?

Briefly describe how ATP acts as an energy carrier in cells.

Which of the following has the greatest amount of kinetic energy?

Why is photosynthesis a coupled reaction?

ADP stores energy in its chemical bonds and is able to use that energy for work in the cell. True or False?

Which of the enzymes shown must occur in the gastric region (stomach)of the gastrointestinal tract?

In chemical reactions, ________ reactions release energy and ________ reactions require an input of energy.

Which of the following functions as a biological catalyst?

How is it possible for living organisms to comply with the second law of thermodynamics?