Biology STAAR Practice Test 2026 – Comprehensive All-in-One Guide to Mastering the State of Texas Readiness Exam!

Question: 1 / 400

What are carbohydrates primarily used for in living organisms?

Energy storage

Carbohydrates serve as the primary source of energy for living organisms. They are composed of sugars and starches that can be quickly converted into glucose, which is utilized by cells to fuel various biochemical processes. This energy is critical for muscle contraction, neural function, and maintaining homeostasis among other cellular activities.

While carbohydrates do play roles in other functions—like providing structural support in plants through cellulose—a significant part of their biological function revolves around energy production and storage. The quick availability of energy from carbohydrates makes them an essential macronutrient for all living organisms, allowing them to perform vital tasks efficiently.

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Cell structure maintenance

Genetic information storage

Production of hormones

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