You are running a transcription reaction in your lab. You stop the reaction after a few minutes, and you find that you have three predominant DNA and RNA molecules in your test tube. All have different lengths. The first molecule is 300 nucleotides long, the second is 25 nucleotides long, and the third is 40 nucleotides long. Which molecule is likely the pre-mRNA

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Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.

Tropical rain forests support more species per unit area than any other terrestrial ecosystem. what is one way rain forests are important to the health of the biosphere?