Biology STAAR (State of Texas Assessments of Academic Readiness) Practice Test

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Study for the Biology STAAR Test. Improve your skills with flashcards and multiple choice questions, each question is accompanied by hints and explanations. Prepare for success!

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Which cycle is essential for organisms to make proteins?

  1. Water Cycle

  2. Carbon Cycle

  3. Nitrogen Cycle

  4. Oxygen Cycle

The correct answer is: Nitrogen Cycle

The nitrogen cycle is essential for organisms to make proteins because nitrogen is a key component of amino acids, which are the building blocks of proteins. Organisms require nitrogen in forms they can utilize, such as ammonia or nitrate. Through various processes in the nitrogen cycle, nitrogen is transformed from the atmosphere into forms that plants can uptake. Then, when animals consume these plants or other animals, they obtain the necessary nitrogen to synthesize proteins. This cycle ensures a continuous supply of nitrogen in forms that living organisms can incorporate into their biological processes, specifically protein synthesis.

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