Question 1

Which of the following best describes a hypothesis in the context of scientific inquiry?

Accepted Answer

A tentative explanation that can be tested through experiments and observations

Question 2

Why is carbon uniquely suited to form the backbone of complex biological molecules?

Accepted Answer

It can form four covalent bonds, allowing for diverse and stable molecular structures

Question 3

Which of the following is the smallest unit that can be considered alive?

Accepted Answer

A cell

Question 4

When two water molecules are near each other, what type of bond forms between them?

Accepted Answer

Hydrogen bond

Question 5

What happens to a molecule when it is oxidized during a chemical reaction?

Accepted Answer

It loses covalent bonds or hydrogens

Question 6

Why can a sudden drop in blood pH be harmful to the human body?

Accepted Answer

It denatures proteins, disrupting their function

Question 7

Which of the following must a molecule contain to be classified as organic?

Accepted Answer

Carbon

Question 8

Which process builds larger biological molecules by removing water, and what is its opposite?

Accepted Answer

Dehydration synthesis builds molecules; hydrolysis breaks them down

Question 9

Glycogen is best classified as which type of macromolecule, and what is its primary function in animals?

Accepted Answer

A carbohydrate; it stores glucose for energy

Question 10

Which organelle is present in both prokaryotic and eukaryotic cells?

Accepted Answer

Ribosome

Question 11

A patient asks which organelle is especially abundant in liver cells due to their role in breaking down waste. What is the correct answer?

Accepted Answer

Lysosome

Question 12

The head of a phospholipid is:

Accepted Answer

Hydrophilic

Question 13

Why are unsaturated fats typically liquid at room temperature?

Accepted Answer

They contain double bonds that prevent tight packing

Question 14

A human red blood cell is placed in a 1% salt solution. What type of solution is this, and what happens to the cell?

Accepted Answer

Hypertonic; the cell shrinks

Question 15

Which of the following best defines metabolism?

Accepted Answer

The sum of all chemical reactions in an organism

Question 16

The cell membrane is described as:

Accepted Answer

Semi-permeable

Question 17

What is the relationship between transcription and translation in the central dogma of molecular biology?

Accepted Answer

Transcription produces mRNA, which is then used in translation to synthesize proteins

Question 18

When an organism performs work, such as moving or carrying out chemical reactions, what ultimately happens to the energy?

Accepted Answer

It is lost as heat to the environment

Question 19

Which equation correctly represents the overall reaction for glycolysis?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 2\,\mathrm{NAD}^+ + 2\,\mathrm{ADP} + 2\,\mathrm{P_i} \rightarrow 2\,\mathrm{C_3H_4O_3} + 2\,\mathrm{NADH} + 2\,\mathrm{ATP} + 2\,\mathrm{H_2O}$$

Question 20

During the electron transport chain in cellular respiration, what is the main result of hydrogen ions (protons) accumulating on one side of the membrane?

Accepted Answer

They create a gradient that drives ATP synthesis

Question 21

Which statement about the Calvin cycle is correct?

Accepted Answer

It produces glucose and does not require light directly

Question 22

You observe a cell under a microscope and see a cell plate forming. What type of cell is this, and what process is occurring?

Accepted Answer

Plant cell; cytokinesis

Question 23

What is the primary role of an enzyme in a chemical reaction?

Accepted Answer

To act as a catalyst and speed up the reaction

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