Question 1

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

Accepted Answer

A law describes a mathematical relationship, while a theory provides a scientific explanation for complex phenomena.

Question 2

A scientist observes that a certain plant grows faster in red light than in blue light. She proposes that red light increases the rate of photosynthesis in this plant. Which step of the scientific method does this represent?

Accepted Answer

Formulating a hypothesis

Question 3

Which of the following is NOT a requirement for a valid scientific hypothesis?

Accepted Answer

It must be broad and explain many phenomena.

Question 4

Which of the following is an example of a positive control in an experiment testing the effectiveness of a new antibiotic?

Accepted Answer

A group of bacteria exposed to a known effective antibiotic

Question 5

Why is peer review an essential part of the scientific process?

Accepted Answer

It allows scientists to replicate and independently verify results, reducing bias and error.

Question 6

Which of the following best explains why water is a polar molecule?

Accepted Answer

Oxygen is more electronegative than hydrogen, causing electrons to be pulled closer to the oxygen atom.

Question 7

A researcher wants to study the effect of temperature on enzyme activity. She keeps all variables constant except temperature, which she changes in each trial. What is the independent variable in this experiment?

Accepted Answer

Temperature

Question 8

Which property of water allows insects to walk on its surface?

Accepted Answer

Cohesion due to hydrogen bonding

Question 9

Which of the following statements about evolution by natural selection is correct?

Accepted Answer

Adaptive traits that increase survival and reproduction become more common in the population over time.

Question 10

Which of the following best describes the role of weak chemical bonds, such as hydrogen bonds, in biological systems?

Accepted Answer

They allow for transient interactions between molecules, which are essential for processes like DNA replication and protein folding.

Question 11

A molecule of sodium chloride (NaCl) forms when sodium donates an electron to chlorine. What type of bond is formed?

Accepted Answer

Ionic bond

Question 12

Which of the following is a characteristic shared by all living organisms?

Accepted Answer

They are composed of one or more cells.

Question 13

Which of the following best explains why ice floats on water?

Accepted Answer

Hydrogen bonds stabilize and keep water molecules farther apart in ice than in liquid water.

Question 14

Which of the following is an example of a compound?

Accepted Answer

Sodium chloride (NaCl)

Question 15

Which of the following best describes the relationship between theories and hypotheses?

Accepted Answer

Hypotheses are supported or rejected experiment by experiment, while theories are refined over time as more data is collected.

Question 16

Which of the following is the correct formula for calculating the mass number of an atom?

Accepted Answer

$$	ext{Mass number} = 	ext{Number of protons} + 	ext{Number of neutrons}$$

Question 17

Which of the following best describes why scientific skepticism is important in research?

Accepted Answer

It ensures that only systematic investigation and empirical evidence are used to evaluate scientific claims.

Question 18

Which of the following is a property of covalent bonds?

Accepted Answer

They involve the sharing of electron pairs between atoms.

Question 19

Which of the following best explains why controls are important in experimental design?

Accepted Answer

They allow researchers to measure variability and check for sources of error.

Question 20

Which of the following is a real-world example of the application of the scientific process?

Accepted Answer

The discovery that DNA, not protein, is the genetic material, after repeated experiments and peer review.

BIO 101: Introduction to Biology and Scientific Inquiry

Study Guide - Practice Questions

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