Question 1

Which of the following statements best summarizes the modern cell theory as established by Schwann and Virchow?

Accepted Answer

All organisms consist of one or more cells, the cell is the basic unit of structure for all organisms, and all cells arise only from preexisting cells.

Question 2

Which historical experiment first demonstrated that a compound found in living organisms could be synthesized in the laboratory, challenging the idea of 'vitalism'?

Accepted Answer

Friedrich Wohler's synthesis of urea.

Question 3

A scientist is using a microscope to observe mitochondria in a living cell without staining. Which type of microscopy would be most appropriate for this purpose?

Accepted Answer

Phase-contrast microscopy

Question 4

If a researcher wants to separate proteins based on their size and charge, which technique should they use?

Accepted Answer

Electrophoresis

Question 5

Which equation correctly represents the central dogma of molecular biology as described by Crick?

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Protein$$

Question 6

A scientist is studying the spatial distribution of a protein in a living cell using a fluorescent tag. Which technique is most suitable for this application?

Accepted Answer

Confocal microscopy

Question 7

What is the limit of resolution for a typical light microscope, and what does this mean for observing cellular structures?

Accepted Answer

About 200-350 nm; allows visualization of most organelles but not individual molecules.

Question 8

Which of the following statements about CRISPR genome editing is correct?

Accepted Answer

CRISPR introduces a double-stranded break at a precise location guided by a gRNA.

Question 9

Which of the following is NOT a major strand that contributed to the development of modern cell biology?

Accepted Answer

Physiology

Question 10

A researcher wants to determine the exact mass and composition of a protein isolated from a cell. Which method should they use?

Accepted Answer

Mass spectrometry

Question 11

Which of the following statements about model organisms is TRUE?

Accepted Answer

Model organisms are species that are well-characterized and easy to manipulate for experimental studies.

Question 12

Which process is used to generate many copies of a specific DNA sequence?

Accepted Answer

DNA cloning

Question 13

Which of the following is a correct description of the function of tRNA in protein synthesis?

Accepted Answer

tRNA brings the appropriate amino acid to the ribosome during translation.

Question 14

Which of the following best describes the difference between in vivo and in vitro experiments?

Accepted Answer

In vivo experiments are performed inside living organisms, while in vitro experiments are performed outside living organisms.

Question 15

Which of the following statements about scientific 'facts' is most accurate according to the philosophy of science described in cell biology?

Accepted Answer

Scientific facts are provisional and may be replaced as new evidence emerges.

Question 16

Which of the following is a plausible reason why early cell biology progressed slowly?

Accepted Answer

Microscopes had limited resolution and cell biology was mainly descriptive.

Question 17

Which of the following units would be most appropriate for measuring the diameter of a ribosome?

Accepted Answer

Nanometer ($$nm)$$

Question 18

Which of the following techniques is used to separate molecules based on their chemical affinity, size, or charge?

Accepted Answer

Chromatography

Question 19

Which of the following is an exception to the central dogma of molecular biology?

Accepted Answer

Viruses with reverse transcriptase that synthesize DNA from RNA.

Question 20

Which of the following best describes the role of bioinformatics in modern cell biology?

Accepted Answer

Bioinformatics merges computer science with biology to organize and interpret large amounts of sequence and other biological data.

Chapter 1: A Preview of Cell Biology – Foundations, Microscopy, and the Cell Theory

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