+1-315-636-4485
+91 98151-74050 
This is an MCQ-quiz for ACT Biology, which include questions on finding experimental design in biology.
A biologist wanted to do an experiment involving two species of large cat (species A and species B) around a potential new food source. He isolated the populations of each cat in a location that closely approximated their natural environment, except this potential new food source was the only food source available to them. Experiment 1: When species A was left alone with the new food source, their numbers decreased rapidly until none were left. Experiment 2: When species B was left alone with the new food source, their numbers increased and the species flourished. Experiment 3: When an equal number of species A and B were placed with the new food source, both species maintained relatively constant numbers. Why is it important that each species was in a location that closely approximated their natural environment?
The chart above shows the height growth of three different plant species after a period of 2 weeks. Each plant species was grown in 4 different soil mediums. All the plants were grown in the same environment with equal amounts of light, water, and oxygen.
What factor would weaken the design of this experiment?
All three plants require equal amounts of oxygen and water.
The water used by the plants had mineral levels tested through out the experiment.
Plant 1 requires more light than Plant 2 and Plant 3 in order to reach maximum growth.
All four mediums contain different soil nutrients.
Plant height growth was measured by a computer program.
The chart above shows the height growth of three different plant species after a period of 2 weeks. Each plant species was grown in 4 different soil mediums. All the plants were grown in the same environment with equal amounts of light, water, and oxygen.
Based on the chart, soil Medium C has what effect on plant growth?
Soil Medium C is beneficial for Plant 1, but has negative effects on Plant 2 and Plant 3.
Soil Medium C is beneficial for all three plant types.
Soil Medium C is beneficial for Plant 2, but detrimental for Plant 1 and Plant 3.
Soil Medium C has a negative effect on the height growth of all three plants.
Soil Medium C does not seem to have a noticable effect on Plant 1, but has a beneficial effect on Plant 2 and Plant 3.
Mitochondria make 90% of the energy needed by the body to sustain life. The Mitochondrial Free Radical Theory of Aging (MFRTA) theorizes that individuals who live longest produce fewer mitochondrial oxygen reactive species than individuals that have a shorter life span. Therefore, lifespan will increase if fewer mtROS are produced, and lifespan will decrease if more mtROS are produced. An experiment was done to test this theory, and the results are shown in the chart below. Four test groups of flies were involved, two groups consisted of females, and two groups consisted of males.
Does this data support or dispute the MFRTA theory?
The data supports the theory because it shows an inverse relationship, a high mtROS amount correlates to a high lifespan.
The data does not support the theory because it shows an inverse relationship between the mtROS amount and the length of lifespan.
The data does not support the theory because the experiment does not test the information needed to address the MFRTA theory.
The data supports the theory because some test groups had low numbers of mtROSs and also had long lifespans.
The data does not support the MFRTA theory because it was not able to show an inverse relationship between the number of mtROS and the lifespan of the organisms.
Mitochondria make 90% of the energy needed by the body to sustain life. The Mitochondrial Free Radical Theory of Aging (MFRTA) theorizes that individuals who live longest produce fewer mitochondrial oxygen reactive species than individuals that have a shorter life span. Therefore, lifespan will increase if fewer mtROS are produced, and lifespan will decrease if more mtROS are produced. An experiment was done to test this theory, and the results are shown in the chart below. Four test groups of flies were involved, two groups consisted of females, and two groups consisted of males.
What information would weaken the experiment"s results?
An experiment consisting of a control group of both males and females.
An experiment suggesting mitochondria make more than ninety percent of the body's energy.
An experiment suggesting there is a high-percent error in measuring mitochondrial oxygen reactive species.
A separate experiment done with a different test species that had similar results.
An experiment testing the lifespan of flies in an oxygen-deprived environment.
Mitochondria make 90% of the energy needed by the body to sustain life. The Mitochondrial Free Radical Theory of Aging (MFRTA) theorizes that individuals who live longest produce fewer mitochondrial oxygen reactive species than individuals that have a shorter life span. Therefore, lifespan will increase if fewer mtROS are produced, and lifespan will decrease if more mtROS are produced. An experiment was done to test this theory, and the results are shown in the chart below. Four test groups of flies were involved, two groups consisted of females, and two groups consisted of males.
What, if added, would strengthen the results of the experiment?
A test group living in an isolated environment that showed a lifespan of 100 days and a mtROS amount of three.
Two test groups consisting of a mixed male and female population that had a mtROS amount of 5 and a lifespan of 150 days.
Two test groups consisting of a mixed male and female population that showed an overall decrease in lifespan with higher mtROS amounts.
Two test groups, one male and one female, having a genetic mitochondrial disease but a significantly long lifespan.
All of the answers listed.
An experiment was done to test the antibiotic resistance of the bacteria Pseudomonas flourescens and Escherichia coli by using the antibiotic disk sensitivity method. Four different antibiotics were tested on each bacterium. Media were prepared with each type of bacterium and a drop of each antibiotic was added to each corner of the plates, a different antibiotic in each corner. The cultures were observed for eighteen hours. After this period of time, the zones of inhibition (where the bacteria was not able to grow due to the antibiotic) were measured. The table below shows the results of the four antibiotics on the two bacteria, Pseudomonas flourescens and Escherichia coli.
Which of the following changes would weaken the experimental results?
All of the scenarios listed would weaken the experiment
The experiment tested one bacterial strain instead of two
The experiment looked at two antibiotics instead of four
Two of the antibiotics tested had synergistic effects
The zone of inhibition was measured after five hours of plating
An experiment was done to test the antibiotic resistance of the bacteria Pseudomonas flourescens and Escherichia coli by using the antibiotic disk sensitivity method. Four different antibiotics were tested on each bacterium. Media were prepared with each type of bacterium and a drop of each antibiotic was added to each corner of the plates, a different antibiotic in each corner. The cultures were observed for eighteen hours. After this period of time, the zones of inhibition (where the bacteria was not able to grow due to the antibiotic) were measured. The table below shows the results of the four antibiotics on the two bacteria, Pseudomonas flourescens and Escherichia coli.
Which change to the experimental design would strengthen the results?
Focusing on only two antibiotics instead of four
Testing the four antibiotics on separate plates
Focusing on only one bacteria strain and using more than four antibiotics
Observing the cultures after two hours instead of eighteen hours
All of the choices listed would strengthen the experiment
A biologist wanted to do an experiment involving two species of large cat (species A and species B) around a potential new food source.
He isolated the populations of each cat in a location that closely approximated their natural environment, except this potential new food source was the only food source available to them.
Experiment 1:
When species A was left alone with the new food source, their numbers decreased rapidly until none were left.
Experiment 2:
When species B was left alone with the new food source, their numbers increased and the species flourished.
Experiment 3:
When an equal number of species A and B were placed with the new food source, both species maintained relatively constant numbers.
Which of the following changes would most alter the results of the experiments?
Introduction of an alternative food source
Decreasing the starting number of each species of animal
Raising the temperature in the environment
Increasing the amount of fresh water in the environment
A biologist wanted to do an experiment involving two species of large cat (species A and species B) around a potential new food source.
He isolated the populations of each cat in a location that closely approximated their natural environment, except this potential new food source was the only food source available to them.
Experiment 1:
When species A was left alone with the new food source, their numbers decreased rapidly until none were left.
Experiment 2:
When species B was left alone with the new food source, their numbers increased and the species flourished.
Experiment 3:
When an equal number of species A and B were placed with the new food source, both species maintained relatively constant numbers.
The biologist wants to recreate this experiment, but with fish. Which of the following will he NOT need?
Environments that recreate the natural habitat of the fish
Only one food source for both fish
Similar-sized aquariums
Two different species of fish
