What Kind of Curvature (Geometry of Space)does the Universe Have

question 2

Multiple Choice

What kind of curvature (geometry of space) does the universe have if the universe is unbounded (density < critical density) ?

• A) Flat
• B) Closed
• C) Open
• D) Curvature does not depend on density.

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Definitions:

Activation Energy

The minimum amount of energy required to initiate a chemical reaction, effectively determining the rate at which the reaction will occur.

Enzyme

Biological molecules that significantly speed up the rate of virtually all of the chemical reactions within cells.

Catalyzes

To increase the rate of a chemical reaction without undergoing any permanent chemical change, often pertaining to the action of enzymes.

Cofactor

A non-protein chemical compound or metallic ion that is required for a protein's biological activity to occur.