Question 1

Which of the following best explains why cells are generally small in size?

Accepted Answer

Smaller cells have a larger surface area-to-volume ratio, which facilitates efficient diffusion of materials.

Question 2

Which scientist is credited with first observing 'animalcules' (now known as microorganisms) using a simple microscope?

Accepted Answer

Antonie van Leeuwenhoek

Question 3

Which of the following statements is NOT part of the modern cell theory?

Accepted Answer

All cells contain a nucleus.

Question 4

A scientist wants to observe the detailed internal structure of a mitochondrion. Which type of microscope should they use?

Accepted Answer

Transmission electron microscope

Question 5

Which of the following best describes the structure of a phospholipid in a cell membrane?

Accepted Answer

A hydrophilic phosphate head and two hydrophobic fatty acid tails

Question 6

Which of the following is a defining characteristic of eukaryotic cells but NOT prokaryotic cells?

Accepted Answer

Presence of a membrane-bound nucleus

Question 7

A bacterial cell is placed in a solution with a higher concentration of solutes than inside the cell. What process will primarily occur?

Accepted Answer

Water will move out of the cell by osmosis.

Question 8

Which of the following best describes the 'fluid mosaic model' of the cell membrane?

Accepted Answer

A dynamic structure with proteins and lipids moving laterally within the bilayer

Question 9

Which of the following is NOT a shared feature of all cells?

Accepted Answer

Presence of a cell wall

Question 10

If a spherical cell has a diameter of $$2\ \mu m$$, what is its surface area-to-volume ratio? (Use $$	ext{Surface Area} = 4\pi r^2$ and $$	ext{Volume} = \frac{4}{3}\pi $$r^3)$$

Accepted Answer

$$3:1$$

Question 11

Which domain includes organisms that are often found in extreme environments, such as hot springs or high-salt lakes?

Accepted Answer

Archaea

Question 12

Which of the following is a real-world example of diffusion in the human body?

Accepted Answer

Oxygen moving from the lungs into the bloodstream

Question 13

Which of the following best explains why multicellular organisms can grow larger than single-celled organisms?

Accepted Answer

Multicellularity allows for specialized cell types and overcomes diffusion limitations.

Question 14

Which of the following is NOT a function of the cell membrane?

Accepted Answer

Synthesizing proteins

Question 15

Which of the following is a correct sequence in the levels of biological organization from smallest to largest?

Accepted Answer

Molecule → Organelle → Cell → Tissue

Question 16

Which of the following is a unique feature of prokaryotic cells compared to eukaryotic cells?

Accepted Answer

Lack of membrane-bound organelles

Question 17

A patient is diagnosed with a bacterial infection. Which domain does the causative organism belong to?

Accepted Answer

Bacteria

Question 18

Which of the following best describes osmosis?

Accepted Answer

The diffusion of water across a semi-permeable membrane

Question 19

Which of the following is a correct statement about ribosomes?

Accepted Answer

They are found in both prokaryotic and eukaryotic cells and are involved in protein synthesis.

Question 20

Which of the following is a real-life application of the fluid mosaic model in medicine?

Accepted Answer

Understanding how viruses enter cells by interacting with membrane proteins

Introduction to Cells: Structure, Function, and Diversity

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