Q: A solution has a pH of 4. What is the concentration of hydrogen ions $$[H^+] in $$this solution?

$$[H^+] = 1 \times 10$$^{-4}$$ \ \mathrm{M}$$

Question 1

Which of the following best describes the 'pattern' and 'process' components of the theory of evolution?

Accepted Answer

Pattern refers to the observable changes in populations over time, while process refers to the mechanisms (such as natural selection) that produce those changes.

Question 2

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 independent variable in this experiment?

Accepted Answer

The application of fertilizer

Question 3

Which property of water allows it to moderate Earth's climate by absorbing and releasing large amounts of heat with only slight changes in its own temperature?

Accepted Answer

High specific heat

Question 4

Which of the following statements about covalent and ionic bonds is correct?

Accepted Answer

Ionic bonds involve the transfer of electrons from one atom to another, while covalent bonds involve the sharing of electrons between atoms.

Question 5

Which of the following best explains why carbon is considered the backbone of life?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for a diversity of stable, complex molecules.

Question 6

A solution has a pH of 4. What is the concentration of hydrogen ions $$[H^+] in $$this solution?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-4}$$ \ \mathrm{M}$$

Question 7

Which of the following is a correct comparison between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a nucleus, while prokaryotic cells lack a nucleus.

Question 8

Which functional group is characterized by a phosphorus atom bonded to four oxygen atoms, and is important in energy transfer reactions such as ATP?

Accepted Answer

Phosphate group

Question 9

Which of the following best describes a hydrophilic substance?

Accepted Answer

A substance that dissolves easily in water due to its polarity, such as table salt.

Question 10

Which of the following is NOT one of the four most important elements for living things?

Accepted Answer

Calcium

Question 11

A molecule of water ($$H_2O) is $$held together by which type of bond, and what type of bond forms between two water molecules?

Accepted Answer

Covalent bonds within the molecule; hydrogen bonds between molecules

Question 12

Which statement best describes the 2nd law of thermodynamics?

Accepted Answer

Every energy transfer increases the entropy (disorder) of the universe.

Question 13

Which of the following best describes an isotope?

Accepted Answer

An atom with the same number of protons but a different number of neutrons.

Question 14

Which of the following is an example of a polar covalent bond?

Accepted Answer

The bond between hydrogen and oxygen in $$H_2O$$

Question 15

Which of the following best describes the difference between an element and a compound?

Accepted Answer

An element is a substance made of only one type of atom, while a compound is made of two or more different elements chemically combined.

Question 16

Which of the following best explains why salt ($$NaCl) $$dissolves in water?

Accepted Answer

The positive and negative ions of salt are attracted to the partial charges of the polar water molecules.

Question 17

Which of the following is the correct order of the levels of organization in living things, from smallest to largest?

Accepted Answer

Atom, molecule, cell, tissue, organ, organism, population

Question 18

Which of the following best describes the difference between molecular and structural formulas?

Accepted Answer

Molecular formulas show only the types and numbers of atoms, while structural formulas show the arrangement of atoms.

Question 19

A researcher observes that a certain trait becomes more common in a population over several generations. According to the process of natural selection, which of the following is the most likely explanation?

Accepted Answer

The trait increases the fitness of individuals, allowing them to survive and reproduce more successfully.

Question 20

Which of the following best describes the concept of electronegativity?

Accepted Answer

The ability of an atom to attract electrons toward itself in a chemical bond.

Biology 1306 Exam 1 Review – Step-by-Step Study Guidance

Study Guide - Practice Questions

Study Guide - Flashcards