Question 1

Which of the following best explains why antibiotics like penicillin are effective against bacterial cells but not human cells?

Accepted Answer

Bacterial cells possess unique cell wall structures and ribosomes that are targeted by antibiotics, while human cells lack these features.

Question 2

A patient is infected with Streptococcus pneumoniae. Which antibiotic mechanism would be LEAST effective against this bacterium?

Accepted Answer

Blocking mitochondrial function

Question 3

Based on the bacterial growth data after 24 hours, which antibiotic was most effective at reducing bacterial growth, and why?

Accepted Answer

Penicillin, because it resulted in the lowest colony count ($$100) by $$inhibiting cell wall synthesis

Question 4

If bacteria evolve resistance to penicillin, which evolutionary process does this best illustrate?

Accepted Answer

Natural selection

Question 5

A student wants to visualize the plasma membrane of a cell. Which type of microscope should they use?

Accepted Answer

Transmission electron microscope

Question 6

Which organelle is most likely malfunctioning in a patient with abnormally high levels of lysosomal enzymes observed in electron microscopy?

Accepted Answer

Lysosome

Question 7

A patient presents with muscle weakness, enlarged liver, and excessive fat granules in the liver. Which organelle is most likely affected?

Accepted Answer

Peroxisome

Question 8

Which of the following best describes the dependent variable in the bacterial growth experiment?

Accepted Answer

Number of bacterial colonies after 24 hours

Question 9

Why is it important for antibiotics to target structures unique to bacteria, such as peptidoglycan cell walls?

Accepted Answer

To minimize harm to human cells by avoiding shared cellular structures

Question 10

A patient with low ATP levels and abnormal mitochondrial function is most likely suffering from a disorder affecting which cellular process?

Accepted Answer

Cellular respiration

Question 11

Which transferable skill is practiced when students analyze ATP data and connect mitochondrial dysfunction to fatigue?

Accepted Answer

Critical Thinking/Problem Solving

Question 12

If a patient’s cells show impaired intracellular movement of sperm flagella, which organelle is most likely malfunctioning?

Accepted Answer

Cytoskeleton

Question 13

Which equation best represents the relationship between bacterial growth rate ($$r$$), initial population ($$N_0$$), and time ($$t) $$under ideal conditions?

Accepted Answer

$$N = N_0$ e$$^{rt}$$

Question 14

A patient with abnormal cell shape and difficulty breathing is found to have impaired lysosomal function. What is the most likely consequence at the cellular level?

Accepted Answer

Accumulation of undigested materials within cells

Question 15

Which of the following is a plausible reason why some antibiotics did NOT work in the bacterial growth experiment?

Accepted Answer

The bacteria lacked the target structure for the antibiotic’s action

Question 16

A patient with progressive difficulty walking and loss of coordination is found to have abnormal mitochondria. Which function is most likely impaired?

Accepted Answer

Energy production (ATP synthesis)

Question 17

Which of the following best describes the function of lysosomes in human cells?

Accepted Answer

Break down cellular waste and macromolecules

Question 18

If a new antibiotic is developed that targets bacterial ribosomes, which cellular process will it most likely disrupt?

Accepted Answer

Protein synthesis

Question 19

A patient with abnormally high levels of cholesterol and fat in the liver is most likely experiencing a malfunction in which organelle?

Accepted Answer

Peroxisome

Question 20

Which of the following strategies could researchers use to overcome bacterial resistance to antibiotics?

Accepted Answer

Develop antibiotics that target new bacterial structures or pathways

Antibiotics, Bacterial Cell Structure, and Organelle Function: Study Guide

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