One Light- Hour Is the Distance Light Travels in One

question 109

Multiple Choice

One light- hour is the distance light travels in one hour. The speed of light is about 300,000 km/s (3 × 105 km/s) . How far is 1 light- hour?

• A)9)46 trillion km (9,460,000,000,000, or 9.46 × 1012 km)
• B)1)08 billion km (1,080,000,000, or 1.08 ×109 km)
• C)18 million km (18,000,000, or 1.8 × 107 km)
• D)300 thousand km (300,000, or 3 × 105 km)

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Definitions:

Glycolysis

Set of reactions that convert glucose to two pyruvate for a net yield of two ATP and two NADH.

Phosphate Group

A functional group consisting of a phosphorus atom bonded to four oxygen atoms, crucial in the structure of DNA and energy transfer.

Antioxidant Molecules

Compounds that prevent oxidation, a chemical reaction that can produce free radicals and thus damage cells.

Free Radicals

Highly reactive molecules with unpaired electrons that can cause damage to cells and DNA, playing a role in aging and various diseases.