Question 1

Which of the following domains contains the most primitive prokaryotes that live in extreme environments?

Accepted Answer

Archaea are known to have the most primitive prokaryotic organisms, and many of them are adapted to live in extreme environments such as hot springs, deep sea vents, and highly acidic or salty habitats. Bacteria also consist of prokaryotes, but they are not as diverse in their adaptations to extreme environments as Archaea. Plantae and Fungi are part of the Eukarya domain and are not relevant to this question.

Question 2

Which of the following does NOT represent homeostasis?

Accepted Answer

Option D describes the flow of energy through an ecosystem, but it does not directly relate to the maintenance of a stable internal environment, which is the definition of homeostasis.

Question 3

Dr. James isolated Staphylococcus aureus, a type of bacteria, from the leg wound of a ten-year-old boy. He suspected these bacteria would grow better at body temperature than room temperature (72 $\degree$F), but thought that he should collect data to support his thinking. Dr. James introduced the same number of Staphylococcus bacteria into each of six test tubes containing the same type and amount of nutrient broth. Three test tubes were incubated at 98.6 $\degree$F (Group 1), while three test tubes (Group 2) sat at 72 $\degree$F. After 24 hours, Dr. James compared the turbidity (indicative of growth) of all six tubes and rated each on a scale of 0 - 4. 0 indicates no turbidity (no growth), while 4 indicates high turbidity (high growth). The following data was collected: 
-Would you consider this to be a controlled experiment?

Accepted Answer

The answer of Dr. James isolated Staphylococcus aureus, a type...

Question 4

A doctor is testing the effectiveness of a new antibiotic. He gives the first group of patients a placebo, a second group receives antibiotic A while the third group receives antibiotic B. Which of the groups is considered the control group?

Accepted Answer

The control group is the group that is used as a baseline for comparison. They do not receive the treatment being tested, in this case, the placebo group. By comparing the results of the placebo group with the other two groups, the doctor can determine whether the antibiotic is effective or not.

Question 5

Which of the following organisms is NOT ultimately dependent on the sun as a source of energy?

Accepted Answer

All of the choices listed are ultimately dependent on the sun for energy, even if indirectly. Night-blooming flowers rely on photosynthesis, which requires sunlight. Earthworms feed on organic matter that is part of a food web based on photosynthesis. Cave fish may eat debris that originates from the surface, where it is part of a food chain that begins with sunlight-driven photosynthesis.

Question 6

Dr. James isolated Staphylococcus aureus, a type of bacteria, from the leg wound of a ten-year-old boy. He suspected these bacteria would grow better at body temperature than room temperature (72 $\degree$F), but thought that he should collect data to support his thinking. Dr. James introduced the same number of Staphylococcus bacteria into each of six test tubes containing the same type and amount of nutrient broth. Three test tubes were incubated at 98.6 $\degree$F (Group 1), while three test tubes (Group 2) sat at 72 $\degree$F. After 24 hours, Dr. James compared the turbidity (indicative of growth) of all six tubes and rated each on a scale of 0 - 4. 0 indicates no turbidity (no growth), while 4 indicates high turbidity (high growth). The following data was collected: 
-After reading the scenario, write the hypothesis that was being tested in Dr. James' experiment.

Accepted Answer

The answer of Dr. James isolated Staphylococcus aureus, a type...

Question 7

Studying a brick does not predict the design of a skyscraper. Intense examination of muscle tissues does not allow you to predict the design of a kangaroo or clam. The structure of chlorophyll does not dictate the unique structure of a tree. These cases demonstrate

Accepted Answer

These cases demonstrate emergent properties that cannot be predicted by examining their parts, which is the definition of emergent properties. The specific structures and functions of complex systems like a tree, kangaroo or clam cannot be completely explained by looking at their individual components.

Question 8

You are interested in the effect of increased carbon dioxide versus normal air, and also in the effect of green light versus full sunlight on the growth of corn plants in a greenhouse. Although you can set up your experiment inside a greenhouse, it is possible that there will be plant growth effects due to effects that you do not know and may never know. Which of the following are important to ensure control of unknown variables?

Accepted Answer

All of the choices are important because they address different variables that could potentially affect the growth of the corn plants. A ensures that there is no confounding effect of other gases when studying the effect of increased carbon dioxide. B ensures that genetic variability between plants is eliminated. C ensures that the plants are receiving the same amount of energy regardless of the color of light. D ensures that environmental factors such as temperature and water do not confound the results.

Question 9

From Kansas to central Indiana to Pennsylvania, many people believe that they have water moccasins (also called "cottonmouths") in their ponds. Some assert they have seen them, although they are certainly not so foolish as to try to capture one alive. Meanwhile, the fish and game offices and the range maps in the herpetology books indicate that this poisonous snake does not breed this far north. What is the most scientific attitude to assume on this issue?

Accepted Answer

A field trip to capture and identify the snakes would provide direct evidence to confirm or refute the claims, offering a clear resolution based on empirical data.

Question 10

The expected outcome of an experiment is known as

Accepted Answer

The expected outcome of an experiment, also known as a hypothesis, is a prediction. A scientific model is a representation of information or data, an experiment is the process of testing a hypothesis or prediction, a scientific theory or principle is a well-established explanation for a phenomenon, and experimental results are the data collected during an experiment.

Question 11

One classic definition of life is "a self-replicating molecular assemblage." However, clay particles (in clay soil) contain layered aluminum and iron compounds that determine the pattern of the adjacent layers of sediment. This is technically a self-replicating molecular assemblage.

Accepted Answer

Self-replication of clay particles is a simple and repetitive process without any ability to evolve or respond to the environment. It does not meet the criteria for life, which includes the ability to adapt to changing circumstances and respond to environmental stimuli. Therefore, option E is the best choice.

Question 12

An earlier classification grouped organisms by whether they inhabited the air, land or sea. However, the five-kingdoms-of-life and three-domains system divided into class-order-family-genus-species as described in this chapter is superior because it

Accepted Answer

The five-kingdoms-of-life and three-domains system is superior because it incorporates all the criteria mentioned in the options. It better represents the origin of features held in common, such as DNA, and reflects the origin of adaptations due to the diversity of life for differing environments. Additionally, it is able to organize over 900,000 different species based on similarities related to their structure and evolution. Therefore, all the choices are correct.

Question 13

Some members of Daphnia, a water flea, have a genetic mutation that causes them to prefer warmer environments. These members reproduce and pass these genetic changes to their offspring. The next generation will occupy warmer environments not previously occupied by this species. This is an example of

Accepted Answer

This scenario describes natural selection at work, in which genetic mutations provide a reproductive advantage in a changing environment. The selection results in an adaptation of the population to the new environment, in this case, preferring warmer temperatures.

Question 14

A study is conducted to determine the average length and weight of loblolly pine tree needles in the southeast United States. Is this data obtained through observation or experimentation?

Accepted Answer

The data is obtained through observation because the study involves measuring existing characteristics (length and weight of pine needles) without manipulating any variables.

Question 15

Tropical rainforests have many species that are found in great abundance. A study in the Brazilian rainforest found 487 tree species growing on a single hectare (2.5 acres). In the US and Canada together, there are only 700 species of trees on millions of acres. In one park in a Peruvian rainforest, scientists have identified over 1300 species of butterflies, while in all of Europe there are approximately 320 butterfly species. These findings suggest that

Accepted Answer

The findings suggest that rainforests are biologically more diverse than other ecosystems. The abundance of tree and butterfly species in the rainforest compared to other regions highlights this diversity.

Question 16

Both living and nonliving entities adapt to the environment.

Accepted Answer

Only living entities have the ability to adapt to their environment through biological and evolutionary processes. Nonliving entities do not adapt but can undergo physical or chemical changes due to environmental factors.

Question 17

Biodiversity in a particular ecosystem

Accepted Answer

Biodiversity in a particular ecosystem includes the total number of species present, the variability of individual genes within those species, and how those species interact to impact the overall function of the ecosystem. Therefore, all of the given choices are correct.

Question 18

A cell is to a tissue as an atom is to a

Accepted Answer

Cells are the building blocks of tissues, just like atoms are the building blocks of molecules.

Question 19

Some biologists study the complex interactions of animals and plants in forests or prairies. Such ecology field research often produces slightly different results for different researchers. In contrast, ecology experiments that are run indoors with one organism in a terrarium usually produce results that are repeatable. What is the most likely explanation?

Accepted Answer

In a laboratory setting, it is easier to control the variables and limit extraneous factors that could affect the results. This makes it more likely that experiments with one organism in a terrarium will produce repeatable results. In contrast, field research in complex ecological environments makes it much more difficult to control variables, leading to different results and less repeatability.

Question 20

Which of the following concepts is NOT one of the unifying theories of biology?

Accepted Answer

The theory of spontaneous generation has been disproven by the scientific community and is not considered a unifying theory of biology. It was once believed that living organisms could arise from non-living matter, but this theory has since been discredited. The other choices are all well-established theories in biology.

Quiz 1: A View of Life