Question 1

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

Accepted Answer

Small cells have a higher surface area-to-volume ratio, which allows for more efficient diffusion of nutrients and waste.

Question 2

Which scientist is credited with coining the term 'cell' after observing cork under a microscope?

Accepted Answer

Robert Hooke

Question 3

Which of the following is NOT a component found in all cells?

Accepted Answer

Chloroplast

Question 4

A scientist observes a cell with circular DNA, no nucleus, and no membrane-bound organelles. Which type of cell is being observed?

Accepted Answer

Prokaryotic cell

Question 5

Which of the following best describes the function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

Synthesis and secretion of polysaccharides

Question 6

Which equation correctly represents the surface area of a sphere, which is relevant for understanding cell size?

Accepted Answer

$$A = 4\pi r^2$

Question 7

Which of the following statements about mitochondria is TRUE?

Accepted Answer

Mitochondria have their own circular DNA, similar to prokaryotes.

Question 8

Which process requires energy input from the cell to move substances across the plasma membrane?

Accepted Answer

Active transport

Question 9

Which of the following best explains why the electron microscope was a significant advancement over earlier microscopes?

Accepted Answer

It allowed scientists to view much smaller structures due to its higher resolving power.

Question 10

A mutation prevents the formation of transport proteins in a cell membrane. Which process would be most directly affected?

Accepted Answer

Facilitated diffusion

Question 11

Which of the following is a unique feature of plant cells not found in animal cells?

Accepted Answer

Cell wall

Question 12

Which scientist is most closely associated with the discovery of microorganisms using a simple microscope?

Accepted Answer

Antonie van Leeuwenhoek

Question 13

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

Accepted Answer

A flexible layer made of lipid molecules interspersed with proteins

Question 14

Which of the following is a correct statement of the cell theory?

Accepted Answer

All cells come from preexisting cells.

Question 15

A cell is observed to have a nuclear envelope, linear DNA, and membrane-bound organelles. Which type of cell is this?

Accepted Answer

Eukaryotic cell

Question 16

Which of the following best explains why mitochondria are inherited almost exclusively from the mother?

Accepted Answer

Sperm rarely contribute mitochondria to the fertilized egg, and any that do are destroyed.

Question 17

Which of the following best describes the function of the cytoskeleton in eukaryotic cells?

Accepted Answer

It provides structural support and facilitates movement within the cell.

Question 18

Which of the following is a function of the endoplasmic reticulum?

Accepted Answer

Channels materials to different parts of the cell and is the main site of lipid synthesis.

Question 19

Which of the following best describes vesicle transport in cells?

Accepted Answer

It moves large molecules, such as proteins and polysaccharides, across the cell membrane.

Question 20

A cell with a surface area of $$126\ \mathrm{\mu m}^2$$ and a volume of $$42\ \mathrm{\mu m}^3$$ has a surface area-to-volume ratio of:

Accepted Answer

$$3.0$$

Microscopy and the Foundations of Cell Theory in Biology

Study Guide - Practice Questions