Activation Energy

Activation energy is

Your Answer: the energy released when a substrate binds to an active site. Correct Answer: the energy required to start a metabolic reaction.

True or false: One enzyme can catalyze only one specific type of reaction.

Your Answer: False Correct Answer: True

Which of these describes your body’s metabolic rate?

Your Answer: the number of Calories needed to keep your weight stable Correct Answer: the speed at which enzymes catalyze chemical reactions in your body

Which of these could help you to increase your metabolic rate?

Your Answer: Cut back on proteins in order to lose weight. Correct Answer: Be sure to eat a balanced diet that includes all essential vitamins.

Swimming burns 3.48 Calories/hour/pound of body weight. Kirk weighs 220 pounds. He eats enough Calories every week to maintain his weight. Kirk decides to start swimming in an effort to lose weight. He swims for one hour each day, five days each week. Approximately how many pounds will Kirk lose in one month if he continues his routine?

Your Answer: 1 pound Correct Answer: 4 pounds

In general, muscle cells in animals have more mitochondria than other cell types. Why might muscle cells need more mitochondria?

Your Answer: Muscle cells take in more protein, which must be converted into ATP for energy. Correct Answer: Muscle contraction uses a large amount of ATP.

True or false: Phosphorylation is the process by which ATP gains energy.

Your Answer: True Correct Answer: False

Which of the following occurs during the citric acid cycle?

Your Answer: ATP is converted to ADP. Correct Answer: Carbon dioxide is released.

How many ATP molecules are produced when a microbe breaks a glucose molecule down into ethanol and carbon dioxide? 4

Which of these natural processes does NOT produce energy that can be used for cellular work?

Your Answer: predation of antelope by lions Correct Answer: reception of sunlight shining on your skin

Which of the following takes place outside of the mitochondrion during cellular respiration?

Your Answer: Carbon dioxide is released. Correct Answer: Glucose is broken down into pyruvic acid.

Which of these can undergo glycolysis?

Your Answer: carbohydrates only Correct Answer: carbohydrates and fats only

Microbes transform milk to cheese through

Your Answer: glycolysis. Correct Answer: lactate fermentation.

A home brewer bottles a batch of beer. After a few days, the bottles begin to explode. Which of these is the most likely reason for the exploding bottles?

Your Answer: The beer had too much ethyl alcohol. Correct Answer: Too much sugar was added to the beer.

Individuals with anorexia are at a higher risk for

Your Answer: bulimia. Correct Answer: osteoporosis.

True or false: Insulin injections are always useful for persons with Type 2 diabetes mellitus.

Your Answer: True Correct Answer: False

Lisa’s father began acting differently following his stroke: He had difficulty remembering things and experienced speech problems. If this condition affects the brain, why are obese individuals at higher risk for having a stroke?

Your Answer: The parts of the brain affected by a stroke also regulate body fat. Correct Answer: Obese individuals are more likely to have cholesterol clog the arteries that feed oxygen to the brain.