Exam 5: The Nature of Life on Earth

Most of the oxygen in living cells is found in

The basic requirement for metabolism inside cells is

Bacteria are examples of

A photoheterotroph gets its energy from

What is the complementary sequence corresponding to the DNA fragment GATACA?

Energy utilization appears to be

When humans get hot, they sweat in order to reduce their body temperature. Which of the key properties of life is this an example of?

Species are groups of organisms

At a molecular level, evolution proceeds via a process of

The property of response to the environment appears to be

What is the MOST important role that carbohydrates play in living organisms on Earth?

Chemically based extraterrestrial life

Organisms that can survive at very low temperatures are referred to as

What can be said about the presence of order in living organisms?

Plants get their energy directly from the Sun and their carbon from the atmosphere. Given this, they can be classified metabolically as

More than 96% of the mass of living cells are made of

Metabolism is a term that describes the

The tree of life

The fact that all cells used in life on Earth are based on the same biochemistry suggests that

Human beings obtain energy from chemical reactions and carbon from other organisms. Given this, they can be classified metabollically as