Question 1

Which of the following best describes why water is able to dissolve many substances important for life?

Accepted Answer

Water forms hydrogen bonds due to its polarity, allowing it to surround and separate ions and polar molecules.

Question 2

A scientist 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. Which of the following correctly identifies the independent and dependent variables in this experiment?

Accepted Answer

Independent variable: fertilizer application; Dependent variable: plant growth

Question 3

Which of the following statements about the levels of biological organization is correct?

Accepted Answer

Organisms are made up of organ systems, which are made up of organs.

Question 4

Which of the following best explains why carbon is found in so many different molecules in living organisms?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for a variety of stable structures.

Question 5

A solution has a pH of 4. Which of the following statements is true about this solution?

Accepted Answer

It is acidic and has a high concentration of $$H^+$$ ions.

Question 6

Which of the following is an example of a polysaccharide and its function in living organisms?

Accepted Answer

Cellulose; provides structural support in plant cell walls

Question 7

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

Accepted Answer

A hypothesis is a tentative explanation that can be tested, while a theory is a broad explanation supported by extensive evidence.

Question 8

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids are solid at room temperature, while unsaturated fatty acids are usually liquid.

Question 9

Which of the following is a correct comparison between ionic, covalent, and hydrogen bonds?

Accepted Answer

Covalent bonds involve sharing electrons, ionic bonds involve transferring electrons, and hydrogen bonds are weak attractions between polar molecules.

Question 10

Which of the following best describes the role of decomposers in an ecosystem?

Accepted Answer

They break down dead organic matter, recycling nutrients back into the ecosystem.

Question 11

Which of the following is a correct statement about the structure of an amino acid?

Accepted Answer

All amino acids have a central carbon, an amino group ($$-NH_2$), a carboxyl group (-$$COOH$$), and a unique R group.

Question 12

Which of the following best explains why a control group is important in a scientific experiment?

Accepted Answer

It allows the researcher to compare results and determine the effect of the independent variable.

Question 13

Which of the following is a correct sequence of the steps in the scientific method?

Accepted Answer

Observation, Hypothesis, Experiment, Data, Conclusion

Question 14

Which of the following best describes the difference between qualitative and quantitative data?

Accepted Answer

Quantitative data is numerical, while qualitative data is descriptive.

Question 15

Which of the following is true about the atomic structure of a neutral carbon atom?

Accepted Answer

It has 6 protons, 6 neutrons, and 6 electrons.

Question 16

Which of the following best explains the unity and diversity of life according to the theory of evolution?

Accepted Answer

All living things share a common ancestor, but have adapted to different environments over time.

Question 17

Which of the following is a correct comparison between inductive and deductive reasoning?

Accepted Answer

Inductive reasoning uses specific observations to form general conclusions; deductive reasoning uses general principles to predict specific results.

Question 18

Which of the following best describes the difference between an atom and an ion?

Accepted Answer

An atom has an equal number of protons and electrons, while an ion has an unequal number.

Question 19

Which of the following is a correct statement about nucleic acids?

Accepted Answer

DNA and RNA are both nucleic acids that store and transmit genetic information.

Question 20

Which of the following best describes how dehydration synthesis and hydrolysis are related to the formation and breakdown of biological macromolecules?

Accepted Answer

Dehydration synthesis joins monomers to form polymers by removing water, while hydrolysis breaks polymers into monomers by adding water.

Biology: Exploring Life – Study Notes for Chapters 1–3

Study Guide - Practice Questions

Study Guide - Flashcards