Question 1

Which of the following statements best describes why inquiry is essential to science?

Accepted Answer

Inquiry enables scientists to test hypotheses and refine explanations based on evidence.

Question 2

Which statement best distinguishes a scientific hypothesis from a scientific theory?

Accepted Answer

A hypothesis is a testable prediction, while a theory is a well-substantiated explanation.

Question 3

Which of the following is NOT a limitation of science?

Accepted Answer

Science can provide absolute proof for all claims.

Question 4

Which of the following statements about prokaryotes and eukaryotes is correct?

Accepted Answer

Prokaryotes lack a nucleus, while eukaryotes have a nucleus.

Question 5

Which domain of life contains exclusively single-celled organisms without internal compartmentalization?

Accepted Answer

Bacteria

Question 6

Which statement best explains how all life on Earth is linked through evolution?

Accepted Answer

All species share a common ancestor and have diverged over time.

Question 7

Which of the following correctly matches the definitions of atom, element, molecule, and compound?

Accepted Answer

Atom: basic unit of matter; Element: type of atom; Molecule: two or more atoms; Compound: molecule with different elements.

Question 8

Why are carbon, oxygen, hydrogen, and nitrogen the most common elements in living matter?

Accepted Answer

They readily form covalent bonds and combine to form molecules essential for life.

Question 9

Which explanation best describes why hydrogen forms only one bond?

Accepted Answer

It has one valence electron and needs to share one more to fill its outer shell.

Question 10

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

Accepted Answer

A polar covalent bond occurs when atoms have different electronegativity, causing unequal sharing of electrons.

Question 11

Why is water described as a polar molecule?

Accepted Answer

The oxygen atom attracts electrons more strongly, giving it a partial negative charge.

Question 12

Which property of water is most directly responsible for its ability to form hydrogen bonds?

Accepted Answer

Water's polarity allows partial charges to attract each other.

Question 13

One liter of a solution at pH 8 has how many more hydroxyl ions (OH-) than 1 L of a solution at pH 6?

Accepted Answer

$$100$$ times more

Question 14

Which scenario correctly describes how acids affect the hydrogen ion concentration of a solution?

Accepted Answer

Acids donate hydrogen ions, increasing the concentration of H$$^+.$$

Question 15

Which of the following molecules is hydrophobic?

Accepted Answer

A molecule with a long hydrocarbon chain and few polar groups.

Question 16

Which class of biological polymer is made of long chains of amino acids?

Accepted Answer

Proteins

Question 17

Which of the following statements best describes a dehydration reaction?

Accepted Answer

It forms polymers from monomers by removing water.

Question 18

Which of the following statements about the structure of an amino acid is correct?

Accepted Answer

The side chain (R group) determines the chemical properties of the amino acid.

Question 19

Which level of protein structure is stabilized by hydrogen bonds between backbone atoms?

Accepted Answer

Secondary structure

Question 20

Which of the following statements about saturated and unsaturated fatty acids is INCORRECT?

Accepted Answer

Saturated fatty acids are usually liquid at room temperature.

General Biology: Practice Exam 1 Study Guide (Modules 2–7)

Study Guide - Practice Questions