Question 1

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

Accepted Answer

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

Question 2

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

Accepted Answer

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

Question 3

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

Accepted Answer

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

Question 4

A scientist is testing the effect of a new drug on blood pressure. She divides subjects into two groups: one receives the drug, and the other receives a placebo. Neither the subjects nor the researchers know who receives which treatment. What type of experimental design is this?

Accepted Answer

Double-blind experiment

Question 5

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

Accepted Answer

Biosphere $$\rightarrow$$ Ecosystem $$\rightarrow$$ Community $$\rightarrow$$ Population $$\rightarrow$$ Organism $$\rightarrow$$ Cell $$\rightarrow$$ Organelle $$\rightarrow$$ Molecule $$\rightarrow$$ Atom

Question 6

Which of the following statements about the structure of DNA is correct?

Accepted Answer

DNA consists of two antiparallel strands forming a double helix, with a sugar-phosphate backbone and nitrogenous bases paired in the center.

Question 7

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 8

Which of the following best explains why ice floats on 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 life during cold temperatures.

Question 9

Which of the following is NOT a function of proteins in the plasma 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 process is responsible for this movement?

Accepted Answer

Hypotonic solution; osmosis

Question 11

Which of the following statements about ATP is correct?

Accepted Answer

ATP stores energy in its phosphate bonds and releases energy when a phosphate group is removed by hydrolysis.

Question 12

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

Accepted Answer

Enzymes are proteins that act as catalysts, lowering the activation energy of chemical reactions.

Question 13

Which of the following is a property of water that allows it to moderate temperature on Earth?

Accepted Answer

High specific heat, which allows water to absorb and release large amounts of heat with little temperature change.

Question 14

Which of the following statements about the endosymbiosis hypothesis is correct?

Accepted Answer

Mitochondria and chloroplasts originated from free-living prokaryotes that were engulfed by ancestral eukaryotic cells.

Question 15

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 lack these structures.

Question 16

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 it to create a variety of stable and complex structures.

Question 17

A protein's function is altered due to a single amino acid substitution in its primary structure. Which of the following best explains why this can have a dramatic effect?

Accepted Answer

The primary structure determines the folding and shape of the protein, so a change can disrupt its function.

Question 18

Which of the following best describes the process of cotransport across a cell membrane?

Accepted Answer

A transport protein couples the movement of one solute down its concentration gradient to drive the active transport of another solute against its gradient.

Question 19

Which of the following statements about the signal transduction pathway involving G-protein coupled receptors (GPCRs) is correct?

Accepted Answer

GPCRs are located in the plasma membrane and, when activated by a ligand, initiate a cascade that activates G-proteins and downstream signaling pathways.

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

Study Guide - Practice Questions

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