Question 1

Which of the following best describes an emergent property in biological systems?

Accepted Answer

A property that arises only when individual components interact in a specific way, resulting in new characteristics at a higher level of organization.

Question 2

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

Accepted Answer

The application of the new fertilizer.

Question 3

Which of the following statements about the flow of energy and cycling of matter in an ecosystem is correct?

Accepted Answer

Energy flows through an ecosystem, entering as light and exiting as heat, while matter cycles within the ecosystem.

Question 4

Which of the following is NOT one of the five unifying themes of biology?

Accepted Answer

Homeostasis

Question 5

A cell is considered the basic unit of life because:

Accepted Answer

It is the smallest structure that can perform all activities required for life.

Question 6

Which of the following best illustrates the relationship between structure and function in biology?

Accepted Answer

The double helix structure of DNA allows it to store genetic information efficiently.

Question 7

Which of the following is a correct statement about prokaryotic and eukaryotic cells?

Accepted Answer

Prokaryotic cells are generally smaller and simpler than eukaryotic cells.

Question 8

In a negative feedback loop regulating blood glucose, what is the role of insulin?

Accepted Answer

Insulin decreases blood glucose by stimulating cells to take up glucose.

Question 9

Which of the following is an example of positive feedback in biological systems?

Accepted Answer

The release of oxytocin during childbirth, which intensifies contractions.

Question 10

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

Accepted Answer

A hypothesis is a specific, testable explanation, while a theory is broader in scope and supported by substantial evidence.

Question 11

Which domain includes organisms that are mostly single-celled and have eukaryotic cell structure?

Accepted Answer

Domain Eukarya

Question 12

A researcher observes that a certain plant species grows taller in sunlight than in shade. She hypothesizes that sunlight increases growth rate. Which of the following would be the best test of her hypothesis?

Accepted Answer

Grow identical plants in both sunlight and shade, measuring their growth rates.

Question 13

Which of the following is an example of inductive reasoning in biology?

Accepted Answer

Observing that all swans seen so far are white and concluding that all swans are white.

Question 14

Which of the following best explains why viruses are not considered living organisms?

Accepted Answer

They cannot reproduce or carry out metabolism independently.

Question 15

Which of the following is a correct example of feedback regulation in the human body?

Accepted Answer

The secretion of insulin in response to high blood glucose, which lowers blood glucose levels.

Question 16

Which of the following is a real-world example of the cycling of matter in an ecosystem?

Accepted Answer

Leaves fall to the ground, decompose, and return minerals to the soil.

Question 17

Which of the following best describes the role of DNA in cells?

Accepted Answer

DNA encodes information for building the molecules synthesized within the cell.

Question 18

A controlled experiment is one in which:

Accepted Answer

All variables are kept constant except the one being tested.

Question 19

Which of the following is a correct example of the relationship between structure and function at the molecular level?

Accepted Answer

The complementary base pairing in the double helix of DNA allows for accurate replication.

Question 20

Which of the following is a correct statement about the three domains of life?

Accepted Answer

Bacteria and Archaea are both prokaryotic, while Eukarya includes all eukaryotic organisms.

Chapter 1: Evolution, Themes of Biology, and Scientific Inquiry

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