Question 1

Which of the following best describes the scientific method as it is actually practiced in modern biology?

Accepted Answer

A flexible process of formulating hypotheses, testing them, and refining ideas based on evidence.

Question 2

Which of the following is a key requirement for a valid scientific hypothesis?

Accepted Answer

It must be directly testable and falsifiable.

Question 3

A scientist observes that a certain plant grows faster in sunlight than in shade. She proposes that light intensity affects plant growth. What is this proposal called?

Accepted Answer

A hypothesis

Question 4

Which of the following statements correctly distinguishes a scientific theory from a scientific law?

Accepted Answer

A law describes a mathematical relationship, while a theory explains observations.

Question 5

In an experiment testing the effect of fertilizer on plant growth, which is the independent variable?

Accepted Answer

The type or amount of fertilizer applied

Question 6

Why are positive and negative controls important in experimental design?

Accepted Answer

They provide measures of variability and help identify sources of error.

Question 7

Which of the following is an example of a retrospective study in scientific research?

Accepted Answer

Comparing the health records of individuals exposed to pollution in the past.

Question 8

Which property of water is primarily responsible for its ability to moderate temperature in living organisms?

Accepted Answer

Its ability to form hydrogen bonds

Question 9

Given the atomic number ($$Z) $$and mass number ($$A) of an $$atom, how do you calculate the number of neutrons?

Accepted Answer

Subtract the atomic number from the mass number: $$N = A - Z$$

Question 10

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

Accepted Answer

Hydrogen bonds in ice create a lattice structure that makes it less dense than liquid water.

Question 11

Which element is most electronegative among the following: sodium (Na), chlorine (Cl), oxygen (O), and hydrogen (H)?

Accepted Answer

Chlorine (Cl)

Question 12

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

Accepted Answer

They all require energy and metabolize.

Question 13

A molecule of water ($$\mathrm{H_2O}) is $$held together by which type of bond?

Accepted Answer

Polar covalent bonds

Question 14

Which of the following best describes the difference between a compound and an element?

Accepted Answer

A compound is made of two or more different elements chemically combined; an element is a pure substance of one type of atom.

Question 15

Which of the following is a real-world example of the importance of peer review in science?

Accepted Answer

The discovery of the ozone hole caused by CFC pollution.

Question 16

Which of the following best describes the role of enzymes in living systems?

Accepted Answer

Enzymes catalyze chemical reactions, making them occur faster and more efficiently.

Question 17

Which of the following is a consequence of using non-standard language in scientific communication?

Accepted Answer

It can lead to misunderstanding and the spread of misinformation.

Question 18

Which of the following is a limitation of comparison studies in scientific research?

Accepted Answer

They may suffer from sampling error and cannot always establish causality.

Question 19

Which of the following best explains why atoms form chemical bonds?

Accepted Answer

To fill their valence electron shells and achieve stability.

Introduction to Biology and Chemical Biology: The Nature of Science and Scientific Methods lecture 1/2

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