Question 1

Which of the following best describes homeostasis in living organisms?

Accepted Answer

The ability to maintain a stable internal environment despite external changes.

Question 2

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

Accepted Answer

Cell, tissue, organ, organ system

Question 3

A scientist observes that a certain plant species only grows in acidic soils. She hypothesizes that soil pH affects seed germination. Which of the following best describes her hypothesis?

Accepted Answer

An educated guess based on prior knowledge and observation.

Question 4

Which of the following statements about water is correct?

Accepted Answer

Water is called a 'universal solvent' because its polar structure allows it to dissolve many substances.

Question 5

What happens to the pH of a solution if the concentration of hydrogen ions $[H^+]$ increases?

Accepted Answer

The pH decreases, making the solution more acidic.

Question 6

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

Accepted Answer

Ice is less dense than liquid water, allowing it to insulate the water below and protect aquatic life from freezing.

Question 7

Which of the following is a function of the cytoskeleton in eukaryotic cells?

Accepted Answer

It provides structural support and enables movement of organelles within the cell.

Question 8

Which organelle is known as the 'powerhouse of the cell' and why?

Accepted Answer

Mitochondria, because they produce ATP from organic macromolecules.

Question 9

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

Accepted Answer

Eukaryotic cells have a nucleus with a nuclear envelope, while prokaryotic cells do not.

Question 10

Which macromolecule contains genetic information?

Accepted Answer

Nucleic acids

Question 11

Which of the following is a correct example of binomial nomenclature?

Accepted Answer

Homo sapiens

Question 12

Which of the following best explains why compartmentalization is important in eukaryotic cells?

Accepted Answer

It increases efficiency and specialization by creating separate, membrane-bound organelles for specific functions.

Question 13

Which of the following is a property of saturated fats?

Accepted Answer

They have no double bonds between carbon atoms and are usually solid at room temperature.

Question 14

Which functional group is found in all amino acids but not in carbohydrates?

Accepted Answer

Amino group $(-NH_2)$

Question 15

Which of the following best describes the primary structure of a protein?

Accepted Answer

The sequence of amino acids in a polypeptide chain.

Question 16

Which of the following best explains the role of ATP in cells?

Accepted Answer

ATP acts as an energy carrier molecule, providing energy for cellular processes.

Question 17

Which of the following is a function of the endoplasmic reticulum (ER)?

Accepted Answer

It is involved in the synthesis and transport of proteins and lipids.

Question 18

Which of the following best describes a buffer and its function in the human body?

Accepted Answer

A buffer is a substance that resists changes in pH by accepting or donating hydrogen ions.

Question 19

Which of the following is a correct statement about dehydration synthesis?

Accepted Answer

It is a reaction in which monomers are joined together by removing a molecule of water.

Question 20

Which of the following best explains why mitochondria and chloroplasts are unique among organelles?

Accepted Answer

They have their own DNA and ribosomes, allowing them to produce some of their own proteins.

General Biology Study Guide: Introduction to Life, Chemistry of Life, Macromolecules, and Cell Structure

Study Guide - Practice Questions

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