Exam 13: Early Life Forms And The Viruses

Anaerobic methanogens produce ____.

Match the following terms with the description  to which they best correspond. -lower the ocean's carbon dioxide concentration

DNA is more stable than RNA for storing genetic information because ____.

A coccus is a(n)____.

All free viral particles contain _____.

The theory that early metabolic reactions occurred in rocks near hydrothermal vents is known as the _____hypothesis.

The ____ protists may cause dysentery after drinking contaminated water.Amoeba

____  are believed to have once existed as independent prokaryotes.

The ____ produce bioluminescent molecules.

The appearance of _____ on Earth due to the action of photosynthetic bacteria occurred about 2.7 billion years ago.

Archaea ____.

Some archaea are extreme halophiles.This means that they thrive in ___ conditions.

Match the following terms with the description to which they best correspond. -cell lacking a membrane-bound nucleus

____ obtain both energy and carbon from organic compounds.

Scientific evidence suggests that Earth had cooled enough for_____ to accumulate by 4.3 billion years ago.

Following infection of a white blood cells by the human immunodeficiency virus (HIV),viral reverse transcriptase produces a ____ copy of its RNA genome.

Some bacteria in the deep oceans use iron as an energy source to make carbohydrates from carbon dioxide.These bacteria would be classified as ____.

Foraminifera are predatory protists with a ____ shell,which is the ultimate source of _____.

Place the following hypothesized events of the beginning of life in their correct order.I organic polymers form II inorganic molecules form III DNA-based cells form IV organic monomers form V protocells in the RNA world form