Question 1

Which of the following best explains why the cell, rather than the molecule, is considered the basic unit of life?

Accepted Answer

Cells are the smallest entities that can carry out all activities required for life, including metabolism and reproduction.

Question 2

Which of the following is an example of an emergent property?

Accepted Answer

A heart pumping blood, which arises from the coordinated contraction of cardiac muscle cells.

Question 3

A scientist observes that birds with longer beaks are more successful at obtaining food in a particular environment. She hypothesizes that beak length is an adaptation to food availability. Which step of the scientific process is she performing?

Accepted Answer

Formulating a hypothesis

Question 4

Which of the following best describes the difference between inductive and deductive reasoning in biology?

Accepted Answer

Inductive reasoning uses specific observations to form general conclusions, while deductive reasoning uses general principles to predict specific results.

Question 5

An atom has an atomic number of 8 and a mass number of 18. How many neutrons does it have?

Accepted Answer

$$18 - 8 = 10$$ neutrons

Question 6

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 7

Which of the following best explains why water is an excellent solvent for ionic and polar substances?

Accepted Answer

Water molecules form hydrogen bonds with ions and polar molecules due to their polarity.

Question 8

A sodium atom ($$Na) $$has 11 electrons. After losing one electron, what is the charge and what type of particle does it become?

Accepted Answer

It becomes a positively charged ion (cation).

Question 9

Which property of water allows insects to walk on its surface, and what is the molecular explanation for this property?

Accepted Answer

Cohesion; hydrogen bonds hold water molecules together at the surface.

Question 10

Which of the following best explains why carbon is considered the most versatile atom in organic chemistry?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for a variety of stable structures.

Question 11

Which of the following is an example of a structural isomer?

Accepted Answer

Two molecules with the same molecular formula but different covalent arrangements of their atoms.

Question 12

Which process is responsible for joining two monosaccharides to form a disaccharide, and what is the byproduct?

Accepted Answer

Dehydration synthesis; water ($$H_2O) is $$released.

Question 13

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

Accepted Answer

The sequence of amino acids in a polypeptide chain.

Question 14

Which of the following statements about saturated and unsaturated fats is correct?

Accepted Answer

Saturated fats have no double bonds between carbon atoms, making them solid at room temperature.

Question 15

Which of the following best distinguishes DNA from RNA?

Accepted Answer

DNA contains deoxyribose sugar and thymine, while RNA contains ribose sugar and uracil.

Question 16

A patient is diagnosed with a genetic disorder caused by a single amino acid change in a protein. Which level of protein structure is directly affected by this mutation?

Accepted Answer

Primary structure

Question 17

Which of the following best describes the role of phospholipids in biological membranes?

Accepted Answer

They form a bilayer with hydrophobic tails facing inward and hydrophilic heads facing outward.

Question 18

Which of the following is an example of the unifying theme of 'information' in biology?

Accepted Answer

The sequence of nucleotides in DNA determines the sequence of amino acids in a protein.

Question 19

Which of the following best explains why natural selection acts on populations rather than individuals?

Accepted Answer

Populations, not individuals, evolve over time as advantageous traits become more common.

Study Guide: Foundations of Biology (Chapters 1-3)

Study Guide - Practice Questions

Study Guide - Flashcards