Q: Which equation would you use to calculate the percentage change in mass of a potato slice after osmosis?

$\frac{\text{final mass} - \text{initial mass}}{\text{initial mass}} \times 100$

Question 1

Which of the following best describes the role of a control group in a biological experiment?

Accepted Answer

It is the group that receives no treatment and serves as a baseline for comparison.

Question 2

A student wants to test the effect of light intensity on plant growth. Which is the most appropriate way to phrase the hypothesis?

Accepted Answer

If plants receive more sunlight, then they will grow taller.

Question 3

Which of the following is the correct formula for calculating the mean of a set of data points $x_1, x_2, ..., x_n$?

Accepted Answer

$\frac{\sum_{i=1}^{n} x_i}{n}$

Question 4

In a study testing a new drug, the null hypothesis states that the drug has no effect. After performing a chi-square test, the p-value is found to be 0.03. What is the correct interpretation?

Accepted Answer

Reject the null hypothesis; there is evidence the drug has an effect.

Question 5

Which of the following best describes a dependent variable in a biological experiment?

Accepted Answer

The variable that is measured and expected to change in response to the independent variable.

Question 6

A graph shows the relationship between enzyme activity and temperature. As temperature increases, enzyme activity rises until a peak, then sharply declines. What biological principle does this illustrate?

Accepted Answer

Enzymes have an optimal temperature range, beyond which they denature.

Question 7

Which of the following is a key reason for including error bars on a graph of experimental data?

Accepted Answer

To indicate the variability or uncertainty in the measurements.

Question 8

A student collects data on the effect of fertilizer on plant height. The mean height for the control group is 15 cm, and for the treated group is 20 cm. If the standard error for both groups is 2 cm, what is the 95% confidence interval for the treated group mean?

Accepted Answer

$20 \pm 4$

Question 9

When analyzing a flow chart of cellular respiration, which step directly produces the most ATP?

Accepted Answer

Electron Transport Chain

Question 10

Which of the following is an example of a testable scientific question?

Accepted Answer

Does increasing the amount of sunlight affect the rate of photosynthesis in spinach leaves?

Question 11

A student is designing an experiment to test the effect of caffeine on heart rate. Which of the following is the best choice for the independent variable?

Accepted Answer

The amount of caffeine administered

Question 12

Which of the following best describes the purpose of reviewing contradictory evidence in scientific research?

Accepted Answer

To strengthen the validity of your conclusions by critically evaluating all available evidence.

Question 13

Which equation would you use to calculate the percentage change in mass of a potato slice after osmosis?

Accepted Answer

$\frac{	ext{final mass} - 	ext{initial mass}}{	ext{initial mass}} 	imes 100$

Question 14

A box-and-whisker plot is used to represent data from an experiment. What does the box represent?

Accepted Answer

The interquartile range (middle 50% of the data)

Question 15

Which of the following is a scientific claim that can be justified using biological principles and data?

Accepted Answer

Increasing nitrogen in soil increases plant growth, as shown by higher average heights in treated groups.

Question 16

A student finds a study on a .edu website that contradicts their hypothesis. What is the best course of action?

Accepted Answer

Critically evaluate the study and consider revising their hypothesis based on the new evidence.

Question 17

Which of the following is NOT a characteristic of a good scientific hypothesis?

Accepted Answer

It is vague and subjective.

Question 18

A student is analyzing a diagram of the carbon cycle. Which process returns carbon dioxide to the atmosphere?

Accepted Answer

Respiration

Question 19

Which of the following best describes the scientific process?

Accepted Answer

It is a self-correcting process where conclusions are subject to revision based on new evidence.

Question 20

A student wants to design a next investigation after finding that a new fertilizer increases plant height. Which would be the most logical next step?

Accepted Answer

Test the effect of the fertilizer on a different plant species.

Scientific Practices in General Biology: A Study Guide

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