- A) 25%
- B) 50%
- C) 75%
- D) 100%
Microbiology MCQ
Total MCQ: 174
MCQ Quiz on Microbiology
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42 The enzyme pepsin functions optimally at a low pH. If pepsin is present in the stomach and the stomach’s pH increases significantly above its optimal range, what will likely happen to the enzyme activity?
- A) The enzyme will continue to function at the same rate.
- B) The enzyme will function more efficiently due to the higher pH.
- C) The enzyme will denature, leading to a decrease in activity.
- D) The enzyme will become inactive but can be reactivated by lowering the pH.
43 In the context of the Hardy-Weinberg equilibrium, which of the following factors would most likely disturb the genetic equilibrium of a population?
- A) Migration of individuals into the population.
- B) Random mating within the population.
- C) Absence of mutation within the population.
- D) No natural selection occurring within the population.
44 Which of the following would most likely be a limitation of the scientists’ approach to determining the evolutionary relationships among the populations?
- A) Small sample sizes of individual plants from each population.
- B) Large number of different environmental factors affecting plant growth.
- C) Limited number of genetic markers used for comparison.
- D) High variability in soil conditions among the sampling sites.
45 The data from which of the following sources would be most useful in predicting the potential impact of a new invasive species on an ecosystem?
- A) Information about the reproductive rates of native species.
- B) Historical data on past invasive species and their effects on similar ecosystems.
- C) Observations of current species interactions in the ecosystem.
- D) Data on climate patterns in the ecosystem.
46 If an individual is heterozygous for a gene that affects flower color, what will be the expected ratio of flower color phenotypes among the offspring?
- A) 1:1 ratio of red to white flowers
- B) 3:1 ratio of red to white flowers
- C) 1:2 ratio of red to white flowers
- D) 1:2:1 ratio of red, pink, and white flowers
47 A population of frogs in an isolated area experiences a sudden increase in genetic diversity. Which of the following is the most likely explanation for this observation?
- A) Migration of individuals from neighboring populations.
- B) A significant increase in the mutation rate of the population.
- C) A rapid decline in the population size due to a genetic bottleneck.
- D) An increase in the population size due to improved environmental conditions.
48 The organisms on the left side of the tree are more closely related to each other than to those on the right side of the tree. Which of the following statements best describes the relationships among these organisms?
- A) The organisms on the left share a more recent common ancestor with each other than with those on the right.
- B) The organisms on the right share a more recent common ancestor with each other than with those on the left.
- C) The organisms on the left are more similar to the organisms on the right due to convergent evolution.
- D) The organisms on the left have a greater genetic diversity than those on the right.
49 If the experiment was continued for an additional 500 days, the population density of T. castaneum with the parasite would most likely stabilize at a value closest to which of the following?
- A) 5 beetles/culture dish
- B) 10 beetles/culture dish
- C) 20 beetles/culture dish
- D) 25 beetles/culture dish
50 The vertebrate forelimb initially develops in the embryo as a solid mass of tissue. As development progresses, the solid mass near the end of the forelimb is remodeled into individual digits. Which of the following best explains the role of apoptosis in remodeling of the forelimb?
- A) Apoptosis replaces old cells with new ones that are less likely to contain mutations.
- B) Apoptosis involves the regulated activation of proteins in specific cells of the developing forelimb that leads to the death of those cells.
- C) Apoptosis involves the destruction of extra cells in the developing forelimb, which provides nutrients for phagocytic cells.
- D) Apoptosis in the developing forelimb triggers the differentiation of cells whose fate was not already determined.