The Semimajor Axis of Pluto's Orbit Is Almost 40 Au

question 7

Multiple Choice

The semimajor axis of Pluto's orbit is almost 40 au. From its orbit around Earth, the Hipparcos satellite measured stellar parallaxes to an accuracy of about 0.01 arcsecond. Suppose astronomers use this technique to measure parallax from Pluto's orbit (over the course of half a Pluto "year") . What is the maximum distance they could measure?

• A) 4 pc
• B) 100 pc
• C) 4000 pc
• D) 8000 pc

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Definitions:

Pyruvate

Pyruvate is a key intermediate in several metabolic pathways, including glycolysis, where it can be converted into acetyl-CoA for entry into the Krebs cycle or used for gluconeogenesis.

Anaerobic Respiration

Breakdown of glucose in the absence of oxygen to produce lactic acid and two ATPs; consists of glycolysis and the reduction of pyruvic acid to lactic acid.

Aerobic Respiration

Breakdown of glucose in the presence of oxygen to produce carbon dioxide, water, and approximately 38 ATPs; includes glycolysis, the citric acid cycle, and the electron-transport chain.

ATP

Adenosine triphosphate, a molecule that carries energy within cells for metabolism.