Question 1

Which of the following best describes a scientific theory?

Accepted Answer

A well-substantiated explanation of some aspect of the natural world that is supported by a large body of evidence.

Question 2

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

Accepted Answer

Ability to move independently from place to place.

Question 3

A researcher is testing the effect of a new fertilizer on plant growth. She sets up two groups: one receives the fertilizer, and the other does not. What is the independent variable in this experiment?

Accepted Answer

Whether or not the plants receive fertilizer.

Question 4

Which of the following statements about the three domains of life is correct?

Accepted Answer

Bacteria and Archaea are both prokaryotic, while Eukarya are eukaryotic.

Question 5

Which of the following best illustrates the unifying theme that 'structure and function are related' in biology?

Accepted Answer

The long, thin shape of a nerve cell allows it to transmit electrical signals over long distances.

Question 6

A scientist observes that a certain species of bird only builds nests in oak trees. She hypothesizes that the birds prefer oak trees because they provide better camouflage. Which of the following would be the best prediction based on her hypothesis?

Accepted Answer

If birds are given a choice between oak and pine trees, they will build more nests in oak trees.

Question 7

Which of the following is the smallest unit of life that can carry out all the functions necessary for life?

Accepted Answer

A cell

Question 8

Which of the following best describes natural selection?

Accepted Answer

The process by which individuals with advantageous traits survive and reproduce more successfully.

Question 9

In a controlled experiment, why is it important to have a control group?

Accepted Answer

To provide a baseline for comparison with the experimental group.

Question 10

Which of the following is an example of the transfer and transformation of energy in living systems?

Accepted Answer

A plant converting sunlight into chemical energy through photosynthesis.

Question 11

Which of the following statements about scientific hypotheses is correct?

Accepted Answer

A scientific hypothesis must be testable and falsifiable.

Question 12

A biologist is studying the effect of temperature on enzyme activity. She measures the rate of reaction at different temperatures. What is the dependent variable in this experiment?

Accepted Answer

The rate of reaction of the enzyme.

Question 13

Which of the following best explains why evolution is considered a unifying theme in biology?

Accepted Answer

It explains both the diversity and the similarities among all living organisms.

Question 14

Which of the following is an example of an observational study rather than an experimental study?

Accepted Answer

A scientist records the number of different bird species in a forest over a year without manipulating any variables.

Question 15

Which of the following best demonstrates the theme that 'living systems are interconnected and interacting'?

Accepted Answer

Bees pollinating flowers, which allows plants to reproduce and provides food for the bees.

Question 16

A student claims that because a hypothesis is supported by experimental data, it is now a proven fact. Which of the following best addresses this misconception?

Accepted Answer

Scientific knowledge is always subject to revision as new evidence becomes available.

Question 17

Which of the following correctly orders the scales of life from smallest to largest?

Accepted Answer

Molecule $$\rightarrow$$ Cell $$\rightarrow$$ Tissue $$\rightarrow$$ Organ $$\rightarrow$$ Organism

Question 18

Which of the following is a real-world example of the flow of information in living systems?

Accepted Answer

DNA in a cell is transcribed into RNA, which is then translated into a protein.

Question 19

A scientist wants to test if a new medication lowers blood pressure. She randomly assigns 100 patients to receive the medication and 100 to receive a placebo. After 6 months, she compares the average blood pressure in both groups. Which of the following best describes the control group in this experiment?

Accepted Answer

The group that receives the placebo.

Question 20

Which of the following is a requirement for a statement to be considered a scientific hypothesis?

Accepted Answer

It must be testable through observation or experimentation.

Introduction to Biology: Key Concepts and Themes

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