Question 1

Which of the following best illustrates the concept of emergent properties in biological systems?

Accepted Answer

A single muscle cell can contract, but a whole muscle can produce coordinated movement.

Question 2

Which of the following is the correct sequence of biological organization from smallest to largest?

Accepted Answer

Molecule → Organelle → Cell → Tissue → Organ → Organ System → Organism → Population → Community → Ecosystem

Question 3

A patient with a genetic mutation that causes improper folding of a protein responsible for transporting LDL cholesterol in the blood is most likely experiencing a disruption at which level of biological organization?

Accepted Answer

Molecular

Question 4

Which of the following is NOT a unifying theme of biology?

Accepted Answer

Gravity

Question 5

Which of the following best describes the process of natural selection?

Accepted Answer

Individuals with heritable traits that increase survival and reproduction in a given environment leave more offspring, causing those traits to become more common in the population over generations.

Question 6

In the evolution of lactase persistence in human populations, which observation is MOST necessary to support natural selection as the explanation for the increased frequency of lactase persistence?

Accepted Answer

Lactase-persistence variants are inherited, and under historical conditions associated with dairying, individuals carrying them produced more surviving offspring than noncarriers.

Question 7

A researcher is studying the effect of different concentrations of sodium chloride (NaCl) on the diffusion rate of chloride ions through a semi-permeable membrane. The data consists of NaCl concentrations (0, 10, 20, 30, 40 mM) and their corresponding diffusion rates (0, 0.2, 0.5, 0.7, 0.8 µmol/min). Which graph type would be most appropriate to visualize the relationship between NaCl concentration and diffusion rate?

Accepted Answer

Line graph

Question 8

Which of the following is an example of a control variable in an experiment testing the effect of antibiotic concentration on bacterial growth?

Accepted Answer

The temperature at which all bacterial cultures are incubated

Question 9

A population of beach mice colonizes a newly formed coastal area with very light-colored sand. After many generations, light-colored mice make up most of the population. Which finding would provide the strongest evidence that the change in coat color resulted from natural selection rather than simply from the presence of variation in the original population?

Accepted Answer

Predators capture dark-colored mice more frequently, and light-colored mice consequently produce more surviving offspring.

Question 10

In a region where malaria is common, three genotypes occur in the population: AA, AS, and SS. Individuals with AA are more vulnerable to severe malaria, while individuals with SS can develop sickle-cell disease. Individuals with AS generally do not develop severe sickle-cell disease and have increased protection against severe malaria. Which prediction BEST explains why both the A and S alleles can remain in the population over many generations?

Accepted Answer

AS individuals can have greater reproductive success than either AA or SS individuals under conditions where malaria is common, maintaining both alleles in the population.

Question 11

Which of the following best describes a scientific hypothesis?

Accepted Answer

A testable and falsifiable explanation for an observation or phenomenon.

Question 12

A student collects data on the number of solute molecules that diffuse across a membrane at different time intervals. The data is presented in the following format: time (x-axis) and number of solute molecules that have diffused (y-axis). Which type of graph would be most appropriate for showing how the number of solute molecules changes over time?

Accepted Answer

Line graph

Question 13

Which of the following is an example of an emergent property at the tissue level?

Accepted Answer

Cardiac muscle tissue can contract rhythmically to pump blood, a property not present in individual muscle cells.

Question 14

Which of the following is a correct statement about the three domains of life?

Accepted Answer

Bacteria and Archaea are both prokaryotic, while Eukarya includes all eukaryotic organisms.

Question 15

A researcher is examining how different levels of pollution affect the number of bird species in a given area. The researcher varies the pollution levels and counts the number of bird species present. Which of the following is the dependent variable in this experiment?

Accepted Answer

Number of bird species

Question 16

In a human population with a long history of cattle domestication, some adults possess genetic variants that allow continued production of lactase, while others experience decreased lactase production after childhood. Which of the following is the best example of a selective pressure in this scenario?

Accepted Answer

The availability of milk as a food source in the population's environment

Question 17

A scientist is testing the effect of temperature on enzyme activity. She keeps the pH and substrate concentration constant in all test tubes. What is the independent variable in this experiment?

Accepted Answer

Temperature

Question 18

Which of the following best describes the role of energy and matter in biological systems?

Accepted Answer

Energy flows through ecosystems, while matter cycles within them.

Question 19

A researcher is comparing the average amount of potassium ions that diffuse through a membrane at different temperatures: 5°C, 15°C, 25°C, 35°C, and 45°C. The researcher wants to show the change in diffusion rate as a function of temperature. Which type of graph would be most appropriate?

Accepted Answer

Line graph

Question 20

In a coastal region, declining fish populations reduce the availability of omega-3–rich seafood for humans. At the same time, increased competition among remaining fish species alters predator–prey relationships. These changes are associated with increased cardiovascular disease risk in the human population. Which level of biological organization is primarily affected in this scenario?

Accepted Answer

Ecosystem

General Biology Chapter 1/21 Study Guide: Step-by-Step Guidance

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