Exam 25: The Origin and Diversity of Life

A scientist is analyzing air bubbles trapped in ancient rocks that can be used to understand the ancient atmosphere.What do you expect the scientist will observe when comparing rocks younger than 3.8 billion years old to rocks older than 3.8 billion years?

Infolding of the cellular membrane has led to the development of the

Two principal organelles in eukaryotes that were apparently derived from different types of bacteria are the

True multicellularity is a major characteristic of

The oldest fossils of eukaryotes have been estimated to be

In the original experiments by Stanley Miller and Harold Urey to synthesize organic molecules in an abiotic environment,which one of the following would you NOT expect to find in the collection flask?

Eukaryotic cells acquired mitochondria and chloroplasts by

Which of the following was produced in experiments on primitive Earth conditions conducted by Miller-Urey and others?

The age of the Earth according to modern estimations is about

How would the hydrolysis of phosphodiester bonds impede the origin of life?

RNA was probably the first molecule used to encode genetic information; the use of DNA came later.This is due to RNA's inherent stability and its ability to store information more accurately than DNA.

What would result for global climate from a massive drop in atmospheric carbon dioxide?

Why is there free oxygen in the air?

Homo sapiens have existed on earth for 2% of the earth's history.

Why is a reducing atmosphere conducive to the origin of life?