Q: Which of the following is an example of a structural isomer?

Glucose and fructose, both with the formula $$\text{C}_6\text{H}_{12}\text{O}_6$$ but different atom connectivity

Question 1

Which property of water allows insects like water striders to walk on its surface, and what is the molecular basis for this property?

Accepted Answer

Surface tension resulting from hydrogen bonding between water molecules

Question 2

A student places a plant cell in a solution and observes that the cell becomes turgid. Which type of solution was the cell placed in, and why does this occur?

Accepted Answer

Hypotonic; water moves into the cell due to higher solute concentration inside

Question 3

Which formula correctly represents the calculation of solute potential ($$\Psi_s) in $$plant cells?

Accepted Answer

$$\Psi_s = iCRT$$

Question 4

Which of the following best describes the role of the sodium-potassium pump in animal cells?

Accepted Answer

It uses ATP to move sodium ions out and potassium ions into the cell, maintaining membrane potential

Question 5

A mutation in the gene encoding a kinase involved in a phosphorylation cascade would most likely affect which stage of signal transduction?

Accepted Answer

Transduction

Question 6

Which of the following is a real-world example of positive feedback in biological systems?

Accepted Answer

Blood clotting after injury, where platelets attract more platelets

Question 7

During DNA replication, which enzyme is responsible for relieving tension ahead of the replication fork?

Accepted Answer

Topoisomerase

Question 8

Which process is illustrated by the equation $$	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6	ext{O}_2 ightarrow 6	ext{CO}_2 + 6	ext{H}_2	ext{O} + 	ext{ATP}$$?

Accepted Answer

Aerobic cellular respiration

Question 9

Which structure in eukaryotic cells is primarily responsible for modifying, sorting, and packaging proteins for transport?

Accepted Answer

Golgi complex

Question 10

A population of beetles is exposed to a new pesticide. Over several generations, most beetles are resistant to the pesticide. Which evolutionary mechanism best explains this change?

Accepted Answer

Natural selection

Question 11

Which of the following is NOT a function of water in living organisms?

Accepted Answer

Structural support for cell walls

Question 12

Which of the following best describes the relationship between enzyme structure and function?

Accepted Answer

The sequence of amino acids determines the 3D shape, which is crucial for enzyme specificity

Question 13

Which of the following is a consequence of a mutation in the extracellular domain of a cell surface receptor?

Accepted Answer

The receptor cannot bind its ligand, preventing signal initiation

Question 14

Which of the following is a key difference between DNA and RNA?

Accepted Answer

DNA is double-stranded, while RNA is usually single-stranded

Question 15

Which of the following best explains why smaller cells are more efficient at exchanging materials with their environment?

Accepted Answer

They have a higher surface area to volume ratio, increasing the rate of material exchange

Question 16

Which of the following is an example of a structural isomer?

Accepted Answer

Glucose and fructose, both with the formula $$	ext{C}_6	ext{H}_{12}	ext{O}_6$$ but different atom connectivity

Question 17

Which process is responsible for breaking down polymers into monomers by adding water?

Accepted Answer

Hydrolysis

Question 18

Which of the following is a function of the central vacuole in plant cells?

Accepted Answer

Regulation of water content and storage of ions

Question 19

Which of the following best describes the role of aquaporins in cellular membranes?

Accepted Answer

They facilitate the rapid passive transport of water molecules

Question 20

Which of the following is a real-world example of gene flow?

Accepted Answer

A population of flowers receives pollen from another population, resulting in offspring with traits from both populations

AP Biology: Chemistry of Life and Cell Structure – Mini-Textbook Study Notes

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