Star Clusters Are Important to Our Study of the Lives

question 25

Multiple Choice

Star clusters are important to our study of the lives of high-mass versus low-mass stars because

• A)stars in each cluster all formed at about the same time all with the same mass.
• B)the Sun was once a member of a globular cluster.
• C)stars in each cluster all formed at about the same time but with differing masses.
• D)stars in each cluster all formed at different times with differing masses.
• E)All of the other choices are correct.

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Definitions:

Phosphorylation

A biochemical process that involves the addition of a phosphate group to a molecule, often altering its function.

Filtration

A process that separates materials based on the ability of one material to pass through a membrane or layer, while others are retained.

Secretion

This is the process by which substances are produced and discharged from a cell, gland, or organ for a particular function in the organism or for excretion.

ADH

Antidiuretic hormone, a hormone produced by the pituitary gland that regulates the balance of water in the body by reducing the amount of water excreted in urine.