Cell Biology, Chemistry, Anatomy & Physiology: Key Concepts and Memory Tricks

Cell Biology

Which organelle is responsible for decoding mRNA during protein synthesis?

A. Mitochondria

B. Ribosome

C. Golgi apparatus

D. Lysosome

B. Ribosome

Explanation: Ribosomes read (decode) mRNA and assemble amino acids into proteins.

Memory Trick: Ribosomes "Read" RNA. R = Ribosome, R = Read

Cell Biology

What is the primary function of ribosomes?

A. Produce ATP

B. Store water

C. Synthesize proteins

D. Digest waste

C. Synthesize proteins

Explanation: Ribosomes are the site of protein production in cells.

Memory Trick: Protein Factory = Ribosome

Chemistry

The atomic number of an element is equal to its number of:

A. Electrons

B. Neutrons

C. Protons

D. Isotopes

C. Protons

Explanation: Every element is identified by its number of protons.

Memory Trick: Atomic Number = Proton Number (AN = PN)

Chemistry

An atom has an atomic number of 8. How many protons does it contain?

A. 6

B. 8

C. 10

D. 16

B. 8

Explanation: The atomic number always equals the number of protons.

Memory Trick: Atomic Number = Protons

Chemistry

What is the primary function of enzymes?

A. Stop chemical reactions

B. Increase the rate of chemical reactions

C. Produce oxygen

D. Store energy

B. Increase the rate of chemical reactions

Explanation: Enzymes are biological catalysts that speed up reactions without being consumed.

Memory Trick: Enzymes = Accelerators of the body

Anatomy & Physiology

Where is glucose primarily reabsorbed in the nephron?

A. Collecting duct

B. Loop of Henle

C. Distal convoluted tubule

D. Proximal convoluted tubule

D. Proximal convoluted tubule

Explanation: Most glucose is reabsorbed in the proximal convoluted tubule (PCT).

Memory Trick: PCT = Picks up Carbs (glucose)

Anatomy & Physiology

Which blood vessel carries oxygen-depleted blood away from the heart?

A. Aorta B.

Pulmonary vein

C. Pulmonary artery

D. Coronary artery

C. Pulmonary artery

Explanation: The pulmonary artery is unique because it carries deoxygenated blood from the heart to the lungs.

Memory Trick: Pulmonary Artery = Poor oxygen blood

Anatomy & Physiology

Which statement about veins and arteries is correct?

A. Both contain valves.

B. Arteries contain valves; veins do not.

C. Veins contain valves; arteries generally do not.

D. Neither contains valves.

C. Veins contain valves; arteries generally do not.

Explanation: Veins have valves to prevent blood from flowing backward.

Memory Trick: Valves in Veins = V & V

Anatomy & Physiology

In the anatomical position, the palms face:

A. Posteriorly

B. Laterally

C. Inferiorly

D. Anteriorly

D. Anteriorly

Explanation: Anatomical position is standing upright with arms at the sides and palms facing forward.

Memory Trick: Anatomical Position = Ready for a Handshake

Anatomy & Physiology

Which best describes the anatomical position?

A. Standing upright, palms facing backward

B. Standing upright, arms crossed

C. Standing upright, arms at sides, palms facing forward

D. Lying flat on the back

C. Standing upright, arms at sides, palms facing forward

Explanation: This is the standard reference position used in anatomy.

Memory Trick: Think of someone standing straight and ready to greet you.

Scientific Method

Which statement is written as a hypothesis?

A. Plants need sunlight.

B. If a plant receives more sunlight, then it will grow taller.

C. Plants are green.

D. Sunlight is important.

B. If a plant receives more sunlight, then it will grow taller.

Explanation: Hypotheses are commonly written as if-then statements.

Memory Trick: Hypothesis = IF this happens, THEN that happens.

Scientific Method

A scientist changes the temperature in an experiment to observe its effect on bacterial growth. Temperature is the:

A. Dependent variable

B. Control group

C. Independent variable

D. Constant

C. Independent variable

Explanation: The independent variable is manipulated by the researcher.

Memory Trick: Independent = I change it.

Scientific Method

Which variable is controlled by the researcher?

A. Dependent variable

B. Independent variable

C. Experimental result

D. Conclusion

B. Independent variable

Explanation: The independent variable is intentionally changed to test its effects.

Memory Trick: Independent Variable = Investigator's Variable

Cell Biology

🧬 Ribosomes = Protein Synthesis

Read mRNA

Build proteins

Chemistry

⚛️ Atomic Number = Number of Protons

⚡ Enzymes = Biological Catalysts

Speed up reactions

Not used up in the process

Anatomy & Physiology

🩸 Pulmonary Artery

Carries oxygen-poor blood

Away from the heart

🩸 Pulmonary Vein

Carries oxygen-rich blood

Toward the heart

🩸 Veins = Valves

Prevent backflow

🩺 PCT = Glucose Reabsorption

🧍 Anatomical Position

Standing upright

Arms at sides

Palms facing forward

Scientific Method

🔬 Hypothesis = If...Then... Statement

🔬 Independent Variable

Manipulated by researcher

🔬 Dependent Variable

Measured outcome

Easy Memory Formula

IV → DV

Independent Variable → affects → Dependent Variable