- A) The water becomes colder at night and thus holds more oxygen.
- B) Respiration in most organisms increases at night.
- C) More organisms are respiring at night than during the day.
- D) Photosynthesis produces more oxygen than is consumed by respiration during the day.
Microbiology MCQ
Total MCQ: 174
MCQ Quiz on Microbiology
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52 Data regarding the presence (+) or absence (-) of five derived traits in several different species are shown in the table below. Which of the following cladograms provides the simplest and most accurate representation of the data in the table?
- A) A)
- B)
- C)
- D)
53 A common laboratory investigation involves putting a solution of starch and glucose into a dialysis bag and suspending the bag in a beaker of water, as shown in the figure below. The investigation is aimed at understanding how molecular size affects movement through a membrane. Which of the following best represents the amount of starch, water, and glucose in the dialysis bag over the course of the investigation?
- A) A)
- B)
- C)
- D)
54 The divergence between the two populations of Rhagoletis must have occurred very rapidly because
- A) The apple tree was imported into North America with European settlement approximately 200 years ago
- B) Flies were imported into North America with European settlement approximately 200 years ago
- C) Long-distance rail transport of fruit increased only after the American Civil War (1861 -1865)
- D) Heavy use of gunpowder during the American Civil War (1861 -1865) led to increased mutation rates in many natural populations of plants and animals
55 A dog is following the scent of a jackrabbit. Which of the following accurately describes how the dog’s brain integrates information for smell?
- A) Chemoreceptors in the brain send impulses for smell in the nasal cavity.
- B) Chemoreceptor cells in the nasal cavity sends impulses to the appropriate area of the brain.
- C) Chemoreceptors on epithelial cells of the tongue send hormones to the appropriate area of the brain.
- D) Receptors originating in the nose send action potentials to the motor regions of the brain.
56 Initially, which of the following isolating mechanisms is likely to have been the most important in preventing gene flow between the two populations of Rhagoletis?
- A) Temporal isolation due to differences in mating time.
- B) Behavioral isolation due to differences in mating behaviors.
- C) Mechanical isolation due to differences in reproductive structures.
- D) Ecological isolation due to different host plants.
57 Thrips are insects that feed on rose pollen. Scientists noted that the thrips population increased in the spring and decreased dramatically during the summer. The researchers hypothesized that food abundance was the limiting factor for the population. Which of the following types of data would be most useful for the scientists to collect at regular intervals on a designated test plot of rose plants?
- A) Amount of sunlight (hours/day)
- B) Mean temperature (°C)
- C) Density of rose pollen produced (g/m²)
- D) Amount of pollen produced by each flower (g/flower)
58 What is the main way in which the cells of the leaves of the small evergreen trees differ from the cells of the leaves of the large trees?
- A) The cells of the leaves of the small evergreen trees have larger vacuoles.
- B) The cells of the leaves of the small evergreen trees have thicker cell walls.
- C) The cells of the leaves of the small evergreen trees have a greater number of chloroplasts.
- D) The cells of the leaves of the small evergreen trees have more mitochondria.
59 If ATP breakdown (hydrolysis) is inhibited, which of the following types of movement across cell membranes is also inhibited?
- A) Movement of oxygen into a cell
- B) Movement of water through aquaporins
- C) Passage of a solute against its concentration gradient
- D) Facilitated diffusion of a permeable substance
60 Which of the following statements provides the best explanation for the main trend shown in the graph above?
- A) The pigment concentration in leaves is not affected by light exposure.
- B) Leaf growth is positively correlated with pigment concentration.
- C) Pigment concentration is inversely correlated with light exposure.
- D) Leaf growth increases linearly with increased pigment concentration.