Question 1

Which of the following best describes the main unifying theme in biology?

Accepted Answer

Evolution, which explains both the unity and diversity of life

Question 2

In the hierarchy of biological organization, which level comes directly after 'organ system'?

Accepted Answer

Organ

Question 3

Which statement about energy and chemical nutrients in ecosystems is correct?

Accepted Answer

Chemical nutrients are recycled, but energy flows one-way and exits as heat

Question 4

A scientist observes a group of ring-tailed lemurs in Madagascar. According to the levels of biological organization, this group represents a:

Accepted Answer

Population

Question 5

Which of the following is NOT a characteristic shared by all living organisms?

Accepted Answer

Presence of a nucleus

Question 6

Which domain includes both unicellular and multicellular organisms?

Accepted Answer

Domain Eukarya

Question 7

Which of the following is a correct sequence from largest to smallest in the biological hierarchy?

Accepted Answer

Biosphere, Ecosystem, Community, Population, Organism

Question 8

Which of the following best explains why decomposers are essential in an ecosystem?

Accepted Answer

They recycle chemical nutrients back to the environment

Question 9

A cell that contains membrane-enclosed organelles and a nucleus is classified as:

Accepted Answer

A eukaryotic cell

Question 10

Which process is responsible for the accumulation of favorable traits in a population over time?

Accepted Answer

Natural selection

Question 11

Which of the following is a correct example of a scientific hypothesis?

Accepted Answer

A proposed explanation for a set of observations

Question 12

Which of the following is NOT a step in the scientific process?

Accepted Answer

Ignore evidence that contradicts your hypothesis

Question 13

Which of the following best describes the role of peer review in scientific research?

Accepted Answer

It helps ensure research is original, significant, logical, and thorough

Question 14

If a scientist is studying the cycling of nutrients from producers to consumers to decomposers, which level of biological organization is most relevant?

Accepted Answer

Ecosystem

Question 15

Which of the following is true about the genetic material in all living cells?

Accepted Answer

All cells use DNA as their genetic material

Question 16

Which of the following is an example of a control in a scientific experiment?

Accepted Answer

A factor that remains constant throughout the experiment

Question 17

Which of the following kingdoms contains only multicellular organisms?

Accepted Answer

Kingdom Plantae

Question 18

Which of the following is a real-world example of homeostasis in living organisms?

Accepted Answer

A human maintaining a stable internal body temperature

Question 19

Which of the following best describes the difference between a theory and a hypothesis in science?

Accepted Answer

A theory is supported by a large body of evidence; a hypothesis is a proposed explanation for a set of observations

Question 20

Which of the following equations best represents the flow of energy in an ecosystem?

Accepted Answer

$$	ext{Sun} ightarrow 	ext{Producers} ightarrow 	ext{Consumers} ightarrow 	ext{Decomposers} ightarrow 	ext{Heat}$$

Introduction to Biology: The Science of Life

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