Question 1

Which of the following best describes an emergent property in biological systems?

Accepted Answer

A property that arises from the arrangement and interaction of parts within a system, such as consciousness emerging from neural networks.

Question 2

A scientist is studying a newly discovered unicellular organism. It has a nucleus, mitochondria, and other membrane-bound organelles. To which domain does this organism most likely belong?

Accepted Answer

Eukarya

Question 3

Which of the following statements about DNA is correct?

Accepted Answer

DNA is composed of nucleotides, each containing a phosphate group, a deoxyribose sugar, and a nitrogenous base.

Question 4

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

Accepted Answer

The oxygen atom is more electronegative than the hydrogen atoms, creating a partial negative charge near the oxygen and a partial positive charge near the hydrogens.

Question 5

A researcher is testing a new drug. She divides her subjects into two groups: one receives the drug, and the other receives a placebo. Neither the subjects nor the researcher knows which group receives the drug. What type of experimental design is this?

Accepted Answer

Double-blind

Question 6

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

Accepted Answer

A hypothesis is a testable explanation for a specific observation, while a theory is a broad explanation supported by a large body of evidence.

Question 7

Which of the following equations correctly represents the relationship between pH and hydrogen ion concentration $$[H^+]$$?

Accepted Answer

$$pH = -\log_{10}[H^+]$$

Question 8

Which of the following best explains why ice floats on liquid water, and why this is important for life on Earth?

Accepted Answer

Ice is less dense than liquid water due to hydrogen bonding, allowing it to float and insulate aquatic environments.

Question 9

Which of the following is a correct statement about the flow of energy and cycling of nutrients in an ecosystem?

Accepted Answer

Energy flows one-way through an ecosystem, while nutrients are recycled.

Question 10

A molecule of glucose ($$C_6H_{12}O_6$) is broken down into two molecules of pyruvate during glycolysis. This process is an example of which type of reaction?

Accepted Answer

Hydrolysis

Question 11

Which of the following best describes the role of ATP in the cell?

Accepted Answer

ATP stores and transfers energy for cellular work by releasing a phosphate group.

Question 12

Which of the following best explains why carbon is central to the diversity of organic molecules?

Accepted Answer

Carbon can form four covalent bonds, allowing for a variety of stable and complex structures.

Question 13

A protein is found to lose its function after being exposed to high heat, but its primary amino acid sequence remains unchanged. What has most likely occurred?

Accepted Answer

The protein has denatured, losing its secondary, tertiary, or quaternary structure.

Question 14

Which of the following best describes the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have membrane-bound organelles, while prokaryotic cells do not.

Question 15

A cell is observed to have a large central vacuole, chloroplasts, and a cell wall. Which type of cell is this most likely to be?

Accepted Answer

Plant cell

Question 16

Which of the following best explains why cells are so small?

Accepted Answer

A high surface area to volume ratio allows for efficient exchange of materials with the environment.

Question 17

Which of the following best describes the function of the sodium-potassium pump in animal cells?

Accepted Answer

It uses ATP to move $$3$$ $$Na^+$$ ions out of the cell and $$2$$ $$K^+$$ ions into the cell, maintaining electrochemical gradients.

Question 18

A cell engulfs a large particle by wrapping its plasma membrane around it and forming a vesicle. What is this process called?

Accepted Answer

Phagocytosis

Question 19

Which of the following best describes the role of G-protein coupled receptors (GPCRs) in cell signaling?

Accepted Answer

GPCRs are membrane proteins that, when activated by a ligand, activate G-proteins to initiate a signal transduction pathway.

Question 20

Which of the following is a correct sequence of events for the scientific method?

Accepted Answer

Observation → Hypothesis → Experiment → Data Analysis → Conclusion

General Biology Exam 1 Study Guide: Foundations, Chemistry, Cells, and Membranes

Study Guide - Practice Questions

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