Cuestionario: Fundamentals of Cell Biology and Physics — 6 preguntas

1. Which structure is found in a plant cell but not in an animal cell?

A. Nucleus

B. Cell membrane

C. Cytoplasm

D. Cell wall

Answer: (D)

Explicación

Plant cells have extra structures including a cell wall, chloroplasts, and a vacuole. Animal cells also have a cell membrane, cytoplasm, and a nucleus, so those are not plant-only.

2. What is the word equation for cell respiration?

A. Glucose + oxygen → carbon dioxide + water + energy

B. Glucose + carbon dioxide → oxygen + water

C. Oxygen + water → glucose + energy

D. Carbon dioxide + water → glucose + oxygen

Answer: (A)

Explicación

Cell respiration breaks down glucose using oxygen to release energy, producing carbon dioxide and water. The other options describe photosynthesis or incorrect reactants and products.

3. What does chlorophyll do in photosynthesis?

A. Absorbs sunlight to power the reaction

B. Transports water through the plant

C. Releases oxygen into the soil

D. Stores glucose in the leaf

Answer: (A)

Explicación

Chlorophyll is the pigment that absorbs sunlight for photosynthesis. It does not store glucose, release oxygen into the soil, or transport water.

4. Which statement correctly describes a gas?

A. It has a fixed shape but no fixed volume

B. It has a fixed volume but no fixed shape

C. It has both a fixed shape and a fixed volume

D. It has no fixed shape or fixed volume

Answer: (D)

Explicación

Gases do not have a fixed shape or a fixed volume. Solids have fixed shape, and liquids have fixed volume, so those options are incorrect.

5. Which pH value would indicate an alkali?

A. 7

B. 10

C. 2

D. 5

Answer: (B)

Explicación

Alkalis have pH values above 7. A pH of 7 is neutral, while values below 7 are acidic.

6. Which formula is used to calculate speed?

A. speed = energy ÷ time

B. speed = force ÷ distance

C. speed = distance ÷ time

D. speed = time ÷ distance

Answer: (C)

Explicación

Speed is calculated by dividing distance by time. The other formulas mix in unrelated quantities or reverse the correct relationship.