-Refer to the H-R Diagram

question 35

Multiple Choice

-Refer to the H-R diagram.How would the H-R diagram of an older star cluster look different?

• A)The points would shift to the right, because all of the stars would have lower temperatures.
• B)The lower main sequence would look the same, but the turnoff would be at spectral type K or M.
• C)The points would shift down, because all of the stars would have lower luminosities.
• D)The lower main sequence would look the same, but the turnoff would be at spectral type F or A.

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Definitions:

Phosphate Group

A chemical group consisting of a phosphorus atom bound to four oxygen atoms, important in energy transfer and molecular structure in biological systems.

Hydrocarbon Side

Refers to the nonpolar, hydrophobic part of a molecule that consists of just hydrogen and carbon, commonly found in organic compounds and influencing their chemical behavior.

Photosynthesis

The process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water, producing oxygen as a byproduct.

Chlorophyll

A group of light-trapping green pigments found in most photosynthetic organisms.