Question 1

Which scientist first coined the term 'cell' after observing compartments in cork under a microscope?

Accepted Answer

Robert Hooke

Question 2

What is the main advantage of electron microscopy over light microscopy in cell biology?

Accepted Answer

It provides higher magnification and better resolution, allowing visualization of subcellular structures as small as $$0.1\ nm.$$

Question 3

Which statement best summarizes the cell theory as proposed by Schwann and Virchow?

Accepted Answer

All organisms consist of one or more cells, and all cells arise only from preexisting cells.

Question 4

A ribosome is approximately $$200\ 	ext{\AA} in $$diameter. If a typical eukaryotic cell is $$20\ \mu m in $$diameter, how many ribosomes would need to be lined up to span the cell's diameter? (Note: $$1\ \mu m = 10,000\ 	ext{\AA})$$

Accepted Answer

Question 5

Which of the following best describes the central dogma of molecular biology?

Accepted Answer

DNA $$\rightarrow$$ RNA $$\rightarrow$$ Protein

Question 6

Which technique would you use to separate proteins based on their size and charge?

Accepted Answer

Electrophoresis

Question 7

Which of the following is NOT a major class of proteins found in cells?

Accepted Answer

Carbohydrate proteins

Question 8

A scientist wants to study the entire set of metabolic reactions occurring in a cell at a given time. Which 'omics' approach should they use?

Accepted Answer

Metabolomics

Question 9

Which property of amino acids is primarily determined by the structure of their R group?

Accepted Answer

Their specific chemical properties such as polarity and charge

Question 10

Which method is best suited for determining the size and composition of individual proteins?

Accepted Answer

Mass spectrometry

Question 11

Why is the limit of resolution important in microscopy?

Accepted Answer

It defines how close two objects can be and still be distinguished as separate.

Question 12

Which of the following statements about cell size is correct?

Accepted Answer

Organelles are typically similar in size to bacterial cells.

Question 13

Which historical experiment laid the foundation for understanding the passage of hereditary factors from parents to offspring?

Accepted Answer

Gregor Mendel's pea plant experiments

Question 14

Which of the following is a real-world application of proteomics?

Accepted Answer

Studying protein interactions in cancer cells to identify drug targets

Question 15

Which process is responsible for linking activated monomers together to form polymers in cells?

Accepted Answer

Condensation reaction (dehydration synthesis)

Question 16

If the limit of resolution for a light microscope is $$200\ nm$$, which of the following structures could NOT be resolved using this microscope?

Accepted Answer

Ribosome ($$20\ nm)$$

Question 17

Which of the following best describes the role of regulatory proteins in cells?

Accepted Answer

They control and coordinate cell function.

Question 18

Which of the following is a correct conversion between units commonly used in cell biology?

Accepted Answer

$$1\ \mu m = 1,000\ nm$$

Question 19

Which of the following techniques would be most appropriate for isolating mitochondria from a cell homogenate?

Accepted Answer

Cellular fractionation using centrifugation

Question 20

Which statement best explains why smaller wavelength light improves the resolving power of a microscope?

Accepted Answer

Smaller wavelengths decrease the limit of resolution, allowing finer details to be distinguished.

Introduction to Cell Biology: Cell Structure and Function

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