Question 1

Which of the following best explains why phospholipids form a bilayer in aqueous environments?

Accepted Answer

Their amphipathic nature causes hydrophilic heads to face water and hydrophobic tails to avoid water, forming a bilayer.

Question 2

A scientist wants to observe the detailed internal structure of mitochondria. Which microscope should they use and why?

Accepted Answer

Transmission electron microscope, because it can reveal internal structures at high resolution.

Question 3

Which of the following organelles is found in plant cells but NOT in animal cells?

Accepted Answer

Chloroplast

Question 4

Which statement best describes the function of the endomembrane system in eukaryotic cells?

Accepted Answer

It synthesizes and transports proteins and lipids throughout the cell.

Question 5

A cell is observed to have a nucleoid region, circular DNA, and no membrane-bound organelles. Which type of cell is this?

Accepted Answer

Prokaryotic cell

Question 6

Which of the following best describes the role of the nuclear pores in the nuclear envelope?

Accepted Answer

They allow selective exchange of materials between the nucleus and cytoplasm.

Question 7

Which two eukaryotic organelles contain their own DNA, supporting the endosymbiotic theory?

Accepted Answer

Mitochondria and chloroplasts

Question 8

A mutation prevents the formation of microtubules in a cell. Which cellular process would be most directly affected?

Accepted Answer

Movement of chromosomes during cell division

Question 9

Which of the following best explains why lysosomes are essential for animal cells?

Accepted Answer

They digest and recycle cellular waste and foreign materials.

Question 10

Which of the following is a key difference between free ribosomes and bound ribosomes?

Accepted Answer

Free ribosomes synthesize proteins for use in the cytosol, while bound ribosomes synthesize proteins for secretion or for membranes.

Question 11

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

Accepted Answer

A flexible bilayer of phospholipids with proteins and other molecules embedded throughout.

Question 12

Which of the following structures is responsible for photosynthesis in plant cells?

Accepted Answer

Chloroplast

Question 13

A multicellular organism is classified in the Domain Eukarya. Which of the following could it NOT be?

Accepted Answer

A bacterium

Question 14

Which of the following best describes the function of the Golgi apparatus?

Accepted Answer

It modifies, sorts, and packages proteins and lipids for storage or transport out of the cell.

Question 15

Which of the following is a function of the extracellular matrix in animal cells?

Accepted Answer

It provides structural support and helps cells communicate with each other.

Question 16

A cell is observed to have a capsule and pili. Which type of organism is this most likely to be?

Accepted Answer

Prokaryotic cell

Question 17

Which of the following best describes the relationship between the rough endoplasmic reticulum (ER) and the Golgi apparatus?

Accepted Answer

Proteins synthesized in the rough ER are transported to the Golgi apparatus for modification and sorting.

Question 18

Which of the following best explains why nonpolar molecules do not dissolve in water?

Accepted Answer

Nonpolar molecules are hydrophobic and cannot form hydrogen bonds with water.

Question 19

Which of the following is a function of the central vacuole in plant cells?

Accepted Answer

It stores water, nutrients, and waste products, and helps maintain turgor pressure.

Question 20

A researcher observes a cell with the following features: a cell wall, chloroplasts, and a large central vacuole. Which type of cell is this?

Accepted Answer

Plant cell

Study Guide: Cell Structure and Microscopy (Chapter 4 – A Tour of the Cell)

Study Guide - Practice Questions