The three-carbon molecules broken down from six-carbon molecules of glucose during the first step in the process of nutrition inall organisms is called A. butane B. ethane C. pyruvate D. methane

[amp_mcq option1=”butane” option2=”ethane” option3=”pyruvate” option4=”methane” correct=”option3″]

The correct answer is C. pyruvate.

Pyruvate is a three-carbon molecule that is formed when glucose is broken down in the first step of cellular respiration. It is then used in the Krebs cycle, which is a series of chemical reactions that produce energy.

Butane is a four-carbon molecule, ethane is a two-carbon molecule, and methane is a one-carbon molecule. These molecules are not involved in the process of cellular respiration.

Here is a diagram of the glycolysis pathway, which is the first step in cellular respiration:

As you can see, glucose is broken down into two pyruvate molecules. These pyruvate molecules are then used in the Krebs cycle, which is the next step in cellular respiration.