Which of the Following Statements About Galaxy and Star Formation

question 79

Multiple Choice

Which of the following statements about galaxy and star formation is true?

• A) Star formation follows a "top-down" sequence whereas galaxy formation involves a "bottom-up" sequence.
• B) Dark matter is essential in the formation of galaxies, but it is not involved in the formation of stars.
• C) Galaxy angular momentum originates in gravitational interactions of clumps whereas star angular momentum is caused by the turbulence of the original molecular clouds.
• D) When stars form they acquire most of the mass of the collapsing system, whereas in a Milky Way-like galaxy much of the matter remains distributed in a disk.
• E) All of these statements are true.

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Definitions:

Receptor

A protein molecule that receives chemical signals from outside a cell, allowing cells to respond to various stimuli.

Signaling Molecule

Chemicals that transport information between cells in the body to coordinate responses.

Scaffold Proteins

Proteins that organize groups of intracellular signaling molecules into signaling complexes.

Integrins

Transmembrane receptors that facilitate cell-extracellular matrix adhesion.