Question 1

The expected outcome of an experiment is known as

Accepted Answer

A prediction is the expected outcome of an experiment based on prior knowledge or hypotheses.

Question 2

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°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°F (Group 1), while three test tubes (Group 2) sat at 72°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 were collected:
$$\begin{array} { | c | c | c | } 
\hline \text { Test Tube } & \text { Temperature } ^ { \circ } \mathrm { F } & \text { Turbidity }  \
\hline \text { Group 1: } & & \
\hline 1 & 98.6 & + 4 \
\hline 2 & 98.6 & + 4 \
\hline 3 & 98.6 & + 3 \
\hline \text { Group 2: } & & \
\hline 4 & 72 & 0 \
\hline 5 & 72 & + 1 \
\hline 6 & 72 & 0 \
\hline
\end{array}$$
-After reading the scenario,write the hypothesis that was being tested in Dr.James's experiment.

Accepted Answer

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

Question 3

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 adaptation, where a genetic mutation allows Daphnia to thrive in a new environment, leading to evolutionary change over generations.

Question 4

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°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°F (Group 1), while three test tubes (Group 2) sat at 72°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 were collected:
$$\begin{array} { | c | c | c | } 
\hline \text { Test Tube } & \text { Temperature } ^ { \circ } \mathrm { F } & \text { Turbidity }  \
\hline \text { Group 1: } & & \
\hline 1 & 98.6 & + 4 \
\hline 2 & 98.6 & + 4 \
\hline 3 & 98.6 & + 3 \
\hline \text { Group 2: } & & \
\hline 4 & 72 & 0 \
\hline 5 & 72 & + 1 \
\hline 6 & 72 & 0 \
\hline
\end{array}$$
-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 and maintain all variables except the one being tested, leading to more consistent and repeatable results.

Question 5

Would you consider this to be a controlled experiment?

Accepted Answer

The answer of Would you consider this to be a...

Question 6

Which of the following organisms are ultimately dependent on the sun as a source of energy?

Accepted Answer

All organisms are ultimately dependent on the sun because the sun is the primary source of energy for photosynthesis, which supports the food chain. Even organisms that do not directly interact with sunlight rely on energy initially captured by photosynthetic organisms.

Question 7

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 one that receives the placebo, as it is used as a baseline to compare the effects of the antibiotics.

Question 8

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°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°F (Group 1), while three test tubes (Group 2) sat at 72°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 were collected:
$$\begin{array} { | c | c | c | } 
\hline \text { Test Tube } & \text { Temperature } ^ { \circ } \mathrm { F } & \text { Turbidity }  \
\hline \text { Group 1: } & & \
\hline 1 & 98.6 & + 4 \
\hline 2 & 98.6 & + 4 \
\hline 3 & 98.6 & + 3 \
\hline \text { Group 2: } & & \
\hline 4 & 72 & 0 \
\hline 5 & 72 & + 1 \
\hline 6 & 72 & 0 \
\hline
\end{array}$$
-The dependent (responding)variable in this experiment is

Accepted Answer

The dependent variable is the one that is being measured or observed in an experiment. In this case, the dependent variable is the growth of bacteria, as indicated by the turbidity in the test tubes. The independent variable is the one that is being manipulated or changed in an experiment. In this case, the independent variable is the temperature.

Question 9

Biodiversity in a particular ecosystem

Accepted Answer

Biodiversity encompasses the variety of species, genetic variability, and the ecological roles they play, all of which impact ecosystem function.

Question 10

Living and nonliving entities share some characteristics. Which statements are TRUE and which are FALSE about the living and nonliving components of an ecosystem?
-Both living and nonliving entities adapt to the environment.

Accepted Answer

Living entities can adapt to the environment through evolution and natural selection, while nonliving entities do not adapt but may change due to external factors.

Question 11

An earlier classification system grouped organisms by whether they inhabited the air,land,or sea.More modern classification systems such as the three-domain system are divided into class-order-family-genus-species as described in this chapter.What advantages does the more modern classification system have over the older system?

Accepted Answer

The modern classification system has several advantages over the older system. It better represents the unity of life by grouping organisms based on their evolutionary relationships. It also allows for the precise organization of a multitude of species and reflects the similarities related to their structure and evolution.

Question 12

All of the following are examples of maintaining homeostasis except:

Accepted Answer

A cancerous tumor growing and metastasizing is not an example of maintaining homeostasis; it is a pathological process that disrupts normal bodily functions.

Question 13

Tropical rain forests have many species that are found in great abundance.A study in the Brazilian rain forest found 487 tree species growing on a single hectare (2.5 acres).In the U.S.and Canada together,there are only 700 species of trees on millions of acres.In one park in a Peruvian rain forest,scientists have identified over 1,300 species of butterflies,while in all of Europe there are approximately 320 butterfly species.These findings suggest that

Accepted Answer

Rain forests are biologically more diverse than other ecosystems, as evidenced by the high number of species found in small areas compared to other regions.

Question 14

You are interested in the effect of increased carbon dioxide versus normal air on the growth of corn plants as well as the effect of green light versus full sunlight on the growth of corn plants.Your plan is to set up your experiment inside a greenhouse where you can control the environment.Which of the following is an aspect of the experiment that should be considered and controlled?

Accepted Answer

All the choices are important considerations to ensure that the experiment results are valid and reliable.

Question 15

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

Accepted Answer

A cell is the basic unit of a tissue, just as an atom is the basic unit of a molecule.

Question 16

The independent (experimental)variable is

Accepted Answer

The independent variable is the one that is manipulated by the experimenter. In this case, the experimenter is manipulating the temperature, so temperature is the independent variable.

Question 17

A researcher is interested in determining the average length and weight of loblolly pine tree needles in the southeast United States.Will the data be obtained through observation or experimentation?

Accepted Answer

The researcher is collecting data on existing characteristics of the loblolly pine tree needles without manipulating any variables, which is observational.

Question 18

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°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°F (Group 1), while three test tubes (Group 2) sat at 72°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 were collected:
$$\begin{array} { | c | c | c | } 
\hline \text { Test Tube } & \text { Temperature } ^ { \circ } \mathrm { F } & \text { Turbidity }  \
\hline \text { Group 1: } & & \
\hline 1 & 98.6 & + 4 \
\hline 2 & 98.6 & + 4 \
\hline 3 & 98.6 & + 3 \
\hline \text { Group 2: } & & \
\hline 4 & 72 & 0 \
\hline 5 & 72 & + 1 \
\hline 6 & 72 & 0 \
\hline
\end{array}$$
-Evaluate the data presented here to reach a conclusion.Would you reject or accept the null hypothesis?

Accepted Answer

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

Question 19

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

Accepted Answer

Spontaneous generation is an outdated and disproven concept that life can arise from non-living matter, which is not a basic theory of modern biology.

Question 20

Which of the following domains contains prokaryotes that are known for living in extreme environments?

Accepted Answer

Archaea are prokaryotes that often live in extreme environments, such as hot springs, salt lakes, and deep-sea hydrothermal vents.

Quiz 1: A View of Life