Life In The Universe

This question bank verified by Studydeets

Questions Bank

Our Place in the Universe
Patterns in the Skymotions of Earth
Laws of Motion
Light and Telescopes
The Formation of Stars and Planets
Terrestrial Worlds in the Inner Solar System
Atmospheres of Venus, Earth, and Mars
The Giant Planets
Small Bodies of the Solar System
Measuring the Stars
Our Star: The Sun
Evolution of Low-Mass Stars
Evolution of High-Mass Stars
The Expansion of Space
The Realm of the Galaxies
Our Galaxy: The Milky Way
Modern Cosmology and the Origin of Structure
Life in the Universe

All Questions

Question 1

Free

True/False

Mutations always lead to improvements in an organism's ability to survive and reproduce.

Choose correct answer/s

True

False

Check answer

Question 2

Free

True/False

According to the theory of evolution,chemical reactions resulting in the mutation of a molecule are a natural and inevitable occurrence.

Choose correct answer/s

True

False

Check answer

Question 3

Free

True/False

Scientists have shown that ammonia and methane,mixed together with hydrogen,carbon dioxide,or nitrogen,and exposed to electrical sparks,can produce some of the amino acids essential for life.

Choose correct answer/s

True

False

Check answer

Question 4

Free

True/False

Approximately 10 percent of all life on Earth has been in the form of microorganisms.

Choose correct answer/s

True

False

Check answer

Question 5

Free

True/False

The four main chemicals of which life on Earth are composed are hydrogen,carbon,oxygen,and sulfur.

Choose correct answer/s

True

False

Check answer

Question 6

True/False

Some forms of life on Earth are silicon-based.

Choose correct answer/s

True

False

To unlock the question

Question 7

True/False

Terrestrial life is composed of 20 different acids that are composed of only 4 different chemical elements.

Choose correct answer/s

True

False

To unlock the question

Question 8

True/False

The Drake equation estimates the number of solar systems in our galaxy today that may harbor life.

Choose correct answer/s

True

False

To unlock the question

Question 9

True/False

The main goal of the Allen Telescope Array is to search for high redshift galaxies.

Choose correct answer/s

True

False

To unlock the question

Question 10

Multiple Choice

In 1952,chemists Harold Urey and Stanley Miller mixed ammonia,methane,and hydrogen in a closed container,zapped it with electrical sparks and found that:

Choose correct answer/s

they could induce cold fusion to occur

they could not induce any amino acids to form

single-celled microorganisms had been spontaneously created

they had created about half the amino acids contained in DNA

To unlock the question

Question 11

Multiple Choice

Where do we think life first formed on the Earth?

Choose correct answer/s

In the air

In the oceans

On land

On asteroids that carried microorganisms to Earth

To unlock the question

Question 12

Multiple Choice

Complex microorganisms that have complex DNA enclosed in a cell nucleus are called:

Choose correct answer/s

algae

bacteria

eukaryotes

prokaryotes

To unlock the question

Question 13

Multiple Choice

Why was the comet impact a chance happening that benefited the evolution of humans?

Choose correct answer/s

It deposited a significant amount of nitrogen into the Earth's atmosphere.

It led to an increase in global UV radiation,which killed off most of the forests and jungles.

Mammals got an evolutionary boost.

Plant life began to decline.

To unlock the question

Question 14

Multiple Choice

If we model the history of the Earth as a single day,at what time would the first primitive forms of microorganisms appear?

Choose correct answer/s

5:00 A.M.

9:00 A.M.

12:00 noon

3:00 P.M.

To unlock the question

Question 15

Multiple Choice

If we model the history of the Earth as a single day,at what time would the first human civilizations appear?

Choose correct answer/s

0.2 seconds before midnight

2 minutes before midnight

10:00 P.M.

6:00 P.M.

To unlock the question

Question 16

Multiple Choice

If we model the age of the universe as a single day,at what time would the earliest traces of humanity appear on the Earth?

Choose correct answer/s

11:00:00 P.M.

11:35:00 P.M.

11:53:10 P.M.

11:59:25 P.M.

To unlock the question

Question 17

Multiple Choice

Which one of the following is NOT one of the three categories of terrestrial life based on their DNA characteristics?

Choose correct answer/s

Bacteria

Eukarya

Archaea

Fungi

To unlock the question

Question 18

Multiple Choice

What occurred approximately 500 million years ago?

Choose correct answer/s

The extinction of the dinosaurs

The Cambrian explosion

The rise of mammals

The birth of the first humans

To unlock the question

Question 19

Multiple Choice

Which one of the following is NOT one of the six chemical elements commonly found in living organisms?

Choose correct answer/s

helium

hydrogen

phosphorus

nitrogen

To unlock the question

Question 20

Multiple Choice

Examine the figure below. The habitable zone around a star depends most on its:

Choose correct answer/s

mass and age

radius and distance

color and distance

luminosity and velocity

To unlock the question