Question 1

Which of the following best explains why compartmentalization was essential for the origin of the first cells on early Earth?

Accepted Answer

It allowed for the concentration of reactants, making metabolic and replication reactions more efficient.

Question 2

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

Accepted Answer

Robert Hooke

Question 3

According to cell theory, which of the following statements is correct?

Accepted Answer

All living organisms are composed of one or more cells.

Question 4

Why are cells generally small in size? Choose the best explanation.

Accepted Answer

A high surface area-to-volume ratio allows efficient exchange of materials with the environment.

Question 5

Which of the following is a key function of the cell membrane?

Accepted Answer

It acts as a selectively permeable barrier, regulating the movement of substances in and out of the cell.

Question 6

Which of the following best describes a protocell as hypothesized in the origin of life?

Accepted Answer

A self-assembled lipid bilayer compartment capable of allowing small molecules to pass and supporting simple replication.

Question 7

Which of the following statements about light and electron microscopes is correct?

Accepted Answer

Light microscopes can be used to observe living cells, while electron microscopes require dead cells.

Question 8

A scientist discovers a fossilized microorganism in a 3.5 billion-year-old rock. Which method would most likely be used to estimate the age of this fossil?

Accepted Answer

Radiocarbon dating, by measuring the remaining $$^{14}C in $$the sample.

Question 9

Which of the following is NOT a direct implication of cell theory?

Accepted Answer

Viruses can replicate independently outside of cells.

Question 10

Which of the following best explains why large organisms are composed of many small cells rather than a few large ones?

Accepted Answer

Small cells have a higher surface area-to-volume ratio, facilitating efficient transport of materials.

Question 11

Which of the following characteristics distinguishes living cells from nonliving things?

Accepted Answer

Living cells maintain homeostasis and pass genetic information to the next generation.

Question 12

Which of the following statements about the domains of life is correct?

Accepted Answer

Prokaryotic cells (Bacteria and Archaea) lack membrane-enclosed internal compartments.

Question 13

Which of the following best describes the function of proteins embedded in the cell membrane?

Accepted Answer

They facilitate communication, transport, and adhesion between cells.

Question 14

A researcher wants to observe the detailed internal structure of a mitochondrion. Which microscopy technique should they use?

Accepted Answer

Transmission electron microscopy (TEM)

Question 15

Which of the following is a reason why the first cells likely required a membrane?

Accepted Answer

To separate the internal environment from the external environment, allowing for controlled chemical reactions.

Question 16

Which of the following best describes the process of self-assembly in the formation of protocells?

Accepted Answer

Fatty acids in water spontaneously form lipid bilayers, creating compartments.

Question 17

Which of the following statements about the resolution of microscopes is correct?

Accepted Answer

Electron microscopes have a higher resolution (as low as $$2\ \mathrm{nm}) $$than light microscopes (about $$0.2\ \mathrm{\mu m}).$$

Question 18

Which of the following is a direct consequence of the surface area-to-volume ratio decreasing as a cell increases in size?

Accepted Answer

The cell becomes less efficient at exchanging materials with its environment.

Question 19

Which of the following best explains why radiocarbon dating is useful for determining the age of ancient biological samples?

Accepted Answer

Living organisms absorb $$^{14}C$$, and after death, the amount of $$^{14}C$$ decreases at a predictable rate.

Question 20

Which of the following is NOT a characteristic of living things as described in the study materials?

Accepted Answer

Living things do not require energy from the environment.

The Origin of Cells and Cell Theory: Structured Study Notes

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