Exam 20: Astrobiology: Life on Other Worlds

____________ shows that the building blocks of life form naturally under a wide range of circumstances.

Which of the following is random

The most important quantity necessary for life to form appears to be the existence of ____________ on the surface of the planet.

Explain each symbol's color, shape, and meaning in the Arecibo message shown in Figure 20-10.

SETI searches for aliens.

Life forms became large and complex during the ______________ period.

The physical basis of life is/are ____________.

The wavelengths that are most likely for communication with other civilizations are those in the water hole.

A cell's DNA molecules contain its genetic material. These molecules are constructed of

The Miller experiment succeeded in creating ____________.

All life on Earth is based on carbon chemistry.

Life emerged from the oceans 400 million years ago.

The Miller-Urey experiment created synthetic DNA.

The primordial soup is not organic-rich.

____________ is a segment of a chromosome that controls a specific function.

The portion of the electromagnetic spectrum between the 21-cm line of neutral hydrogen and the 18-cm line of OH is known as the ____________.

A cell's DNA molecules contain its genetic material. DNA molecules contain patterns for the production of

The water hole is between ____-cm to ____-cm.

Natural selection is random.

What limitation(s) make it impossible to travel between stars I.fuel requirements II.the tremendous distances between stars III.the finite speed at which objects can travel