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

Which of the following statements about DNA is correct?

Accepted Answer

DNA is composed of a sugar-phosphate backbone and nitrogenous bases, forming a double helix structure.

Question 3

A scientist is testing the effect of a new fertilizer on plant growth. She sets up two groups: one receives the fertilizer, and the other does not. Which is the dependent variable in this experiment?

Accepted Answer

The growth of the plants, measured as height or biomass.

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 oxygen and a partial positive charge near hydrogens.

Question 5

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

Accepted Answer

Energy flows through an ecosystem in one direction, while nutrients are recycled.

Question 6

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

Accepted Answer

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

Question 7

A molecule of glucose ($$\mathrm{C_6H_{12}O_6$}) is $$broken down into carbon dioxide and water in a cell. Which type of reaction is this, and what is the main purpose in a biological context?

Accepted Answer

It is a catabolic reaction, and its main purpose is to release energy for cellular work.

Question 8

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

Accepted Answer

Hydrogen bonds in ice keep water molecules farther apart, making ice less dense than liquid water.

Question 9

Which of the following is NOT a function of proteins in the cell membrane?

Accepted Answer

Storing genetic information.

Question 10

A cell is placed in a solution and water moves into the cell, causing it to swell. Which type of solution is the cell in, and what is the process called?

Accepted Answer

The cell is in a hypotonic solution, and the process is osmosis.

Question 11

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

Accepted Answer

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

Question 12

Which of the following statements about the scientific method is correct?

Accepted Answer

A hypothesis is a testable explanation, while a theory is a broader explanation supported by a large body of evidence.

Question 13

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 14

A protein is denatured by heat. Which level(s) of protein structure are most directly affected?

Accepted Answer

Secondary, tertiary, and quaternary structures are disrupted, but the primary structure remains intact.

Question 15

Which of the following best describes the function of the rough endoplasmic reticulum (RER) in eukaryotic cells?

Accepted Answer

The RER synthesizes proteins that are either secreted from the cell, inserted into membranes, or sent to lysosomes.

Question 16

Which of the following best explains the significance of the surface area to volume ratio in cells?

Accepted Answer

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

Question 17

Which of the following is a property of water that helps moderate Earth's climate?

Accepted Answer

Water has a high specific heat, allowing it to absorb and release large amounts of heat with little temperature change.

Question 18

Which of the following best describes the function of enzymes in biological systems?

Accepted Answer

Enzymes act as catalysts, speeding up chemical reactions by lowering the activation energy.

Question 19

A researcher observes that a certain molecule passes through the plasma membrane only when ATP is present. Which type of transport is most likely involved?

Accepted Answer

Active transport, because it requires energy input from ATP.

Question 20

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, initiate a signal transduction pathway by activating a G-protein inside the cell.

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

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