Question 1

Which of the following best describes the relationship between independent and dependent variables in a scientific experiment?

Accepted Answer

The independent variable is manipulated by the researcher, and the dependent variable is the outcome measured.

Question 2

A scientist is testing the effect of different concentrations of a drug on bacterial growth. Which is the independent variable in this experiment?

Accepted Answer

The concentration of the drug

Question 3

Which of the following is a key component of a scientific hypothesis?

Accepted Answer

It is a testable and falsifiable statement.

Question 4

In the context of sickle cell mutation, which levels of biological organization are directly impacted?

Accepted Answer

Molecular, cellular, tissue, organ, and population levels

Question 5

A control variable in an experiment serves which primary purpose?

Accepted Answer

To determine if experimental conditions are affecting the outcome by keeping it constant across groups

Question 6

Which of the following best describes the process of science as outlined in the textbook?

Accepted Answer

Making observations, forming a hypothesis, conducting experiments, analyzing data, and drawing conclusions

Question 7

In a regression analysis, the equation of the regression line is used to:

Accepted Answer

Predict the value of the dependent variable for any value of the independent variable

Question 8

Which equation format correctly represents a linear regression line?

Accepted Answer

$$y = mx + b$$

Question 9

A researcher wants to test if skin color variation is influenced by mean annual temperature. Which variable should be plotted on the x-axis?

Accepted Answer

Mean annual temperature

Question 10

Which of the following statements about natural selection and sickle cell mutation is correct?

Accepted Answer

Sickle cell mutation can confer a survival advantage in malaria-endemic regions due to natural selection.

Question 11

In an experiment testing the effect of temperature on enzyme activity, which is the dependent variable?

Accepted Answer

The rate of enzyme activity

Question 12

Which of the following is NOT a characteristic of a well-designed scientific experiment?

Accepted Answer

Changing multiple variables at once without controls

Question 13

A student hypothesizes that increasing light intensity will increase the rate of photosynthesis in plants. Which is the independent variable?

Accepted Answer

The light intensity

Question 14

Which of the following best defines a variable in the context of experimental design?

Accepted Answer

A condition or factor that can be changed or measured in an experiment

Question 15

If a regression line is used to predict values beyond the span of the data set, this is called:

Accepted Answer

Extrapolation

Question 16

Which of the following is an example of a control in a biological experiment?

Accepted Answer

A group of plants given no fertilizer when testing the effect of fertilizer on growth

Question 17

A hypothesis must be:

Accepted Answer

Based on prior knowledge and testable by experimentation

Question 18

Which of the following best illustrates the application of scientific inquiry in medicine?

Accepted Answer

Developing a hypothesis about a drug's effect, testing it in clinical trials, and analyzing the results

Question 19

In the Biology of Skin Color video, which factor is most directly linked to variation in human skin color?

Accepted Answer

Exposure to ultraviolet (UV) radiation

Question 20

Which of the following is a plausible reason why sickle cell mutation persists in certain populations?

Accepted Answer

It provides resistance to malaria in heterozygous individuals.

Introduction to Biology: Scientific Inquiry and Experimental Design

Study Guide - Practice Questions