Multiple Choice
Which of the following is the best biological explanation for why the human body stores fat?
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7. Energy and Metabolism
Introduction to Metabolism
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As part of the nitrogen cycle, animals acquire some amino acids by doing which of the following?
A
Converting ammonia to nitrate
B
Ingesting proteins from other organisms
C
Fixing atmospheric nitrogen directly
D
Performing photosynthesis
Verified step by step guidance1
Understand the nitrogen cycle: The nitrogen cycle is a biogeochemical process where nitrogen is converted into various chemical forms, including ammonia, nitrate, and nitrogen gas. Animals play a role in this cycle by consuming nitrogen-containing compounds.
Recognize the role of amino acids: Amino acids are the building blocks of proteins, and animals require them for growth and repair. Animals cannot synthesize all amino acids and must acquire some from their diet.
Eliminate incorrect options: Animals do not convert ammonia to nitrate, as this process is performed by bacteria during nitrification. Similarly, animals cannot fix atmospheric nitrogen directly, as this is done by nitrogen-fixing bacteria. Animals also do not perform photosynthesis, which is a process exclusive to plants, algae, and some bacteria.
Identify the correct method: Animals acquire amino acids by ingesting proteins from other organisms, such as plants or other animals. These proteins are broken down into amino acids during digestion.
Conclude: The correct answer is 'Ingesting proteins from other organisms,' as this is how animals obtain the amino acids necessary for their biological functions.
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