Q: Which of the following best describes the flow of genetic information in a eukaryotic cell?

$$\text{DNA} \rightarrow \text{RNA} \rightarrow \text{Protein}$$

Question 1

Which of the following best illustrates the concept of emergent properties in biological systems?

Accepted Answer

A single neuron can transmit electrical signals, but a network of neurons can process complex information and generate consciousness.

Question 2

A scientist is studying a newly discovered organism and observes that its cells lack membrane-bound organelles and have DNA located in a region not separated by a membrane. Which domain does this organism most likely belong to?

Accepted Answer

Bacteria

Question 3

Which of the following statements about the scientific method is CORRECT?

Accepted Answer

A scientific hypothesis must be testable and falsifiable.

Question 4

A patient is injected with a radioactive isotope to trace metabolic activity in the liver. Which property of radioactive isotopes makes this possible?

Accepted Answer

They emit detectable particles and energy as they decay.

Question 5

Which of the following best explains why water is a polar molecule?

Accepted Answer

Oxygen is more electronegative than hydrogen, resulting in unequal sharing of electrons.

Question 6

Which of the following is a correct description of a dehydration reaction?

Accepted Answer

It joins two monomers by removing a molecule of water.

Question 7

A person with sickle-cell disease has a single amino acid substitution in the primary structure of hemoglobin. This change most directly affects which level of protein structure?

Accepted Answer

Primary structure

Question 8

Which of the following best describes the flow of genetic information in a eukaryotic cell?

Accepted Answer

$$	ext{DNA} ightarrow 	ext{RNA} ightarrow 	ext{Protein}$$

Question 9

Which of the following is a function of the smooth endoplasmic reticulum (ER) in liver cells exposed to chronic alcohol consumption?

Accepted Answer

Detoxification of drugs and poisons, leading to increased tolerance

Question 10

Which of the following best explains why animal fats are solid at room temperature while plant oils are liquid?

Accepted Answer

Animal fats are saturated and have straight fatty acid chains that pack tightly.

Question 11

A cell is observed to have a large central vacuole, chloroplasts, and a cell wall. Which type of cell is this most likely to be?

Accepted Answer

Plant cell

Question 12

Which of the following statements about the plasma membrane is correct?

Accepted Answer

It is composed of a phospholipid bilayer with embedded proteins.

Question 13

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

Accepted Answer

It provides structural support, enables cell movement, and organizes organelles.

Question 14

A researcher observes that a certain protein is denatured when exposed to high temperatures. What is the most likely explanation for this observation?

Accepted Answer

High temperatures disrupt weak interactions that maintain the protein's three-dimensional structure.

Question 15

Which of the following is a correct pairing of a macromolecule and its monomer?

Accepted Answer

Protein – Amino acid

Question 16

Which of the following best explains why cellulose is difficult for most animals to digest?

Accepted Answer

Most animals lack enzymes that can hydrolyze $$\beta$$ glycosidic linkages in cellulose.

Question 17

Which of the following is a function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

Modification, sorting, and packaging of proteins for secretion

Question 18

A mutation causes a cell to lack functional dynein proteins. Which cellular process would be most directly affected?

Accepted Answer

Movement of cilia and flagella

Question 19

Which of the following best describes the endosymbiont theory for the origin of mitochondria and chloroplasts?

Accepted Answer

They originated from free-living prokaryotes engulfed by ancestral eukaryotic cells.

Question 20

Which of the following best explains why the surface area-to-volume ratio limits cell size?

Accepted Answer

As a cell grows, its volume increases faster than its surface area, limiting efficient exchange of materials.

Foundations of Biology: Themes, Chemistry, and the Cell

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