Multiple Choice
When solid tumors of animals reach a certain size, the center of the tumor begins to die. To prevent this, the tumor can recruit new blood vessels. What purpose does the recruitment of blood vessels to growing tumors serve?
3. Energy & Cell Processes
Review of Aerobic Cellular Respiration
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When protein molecules are used as fuel for cellular respiration, __________ are produced as waste.
A
fatty acids
B
sugar molecules
C
molecules of lactate
D
ethanol and CO2
E
amino groups
Verified step by step guidance1
Understand that proteins are composed of amino acids, which contain amino groups. When proteins are metabolized for energy, these amino groups are released as waste products.
Recognize that cellular respiration typically involves breaking down carbohydrates and fats, but proteins can also be used as an energy source when necessary.
Identify that during the breakdown of amino acids, the amino group is removed in a process called deamination. This process occurs primarily in the liver.
Learn that the removed amino groups are converted into ammonia, which is toxic to the body. The liver then converts ammonia into urea, a less toxic compound, which is excreted in urine.
Conclude that when protein molecules are used as fuel for cellular respiration, amino groups are produced as waste, which are eventually excreted from the body in the form of urea.
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