Chapter 1 homework (study guide)

In the tutorial, an experiment examining the effect of brewing temperature on coffee taste was discussed and is illustrated below. Match each component of the experiment to its correct description.

1. Coffee taste Dependent variable 2. One hundred people Sample size 3. Water temperature Independent variable 4. Brewing time Standardized variable

You perform an experiment in which you take 16 pots of strawberry plants and give half of them 1 gram of ammonium nitrate per liter of water and the other half receive only water. Each group is then split in half again, and exposed to either 8 or 16 hours of light each day. You monitor the height of the plants for 4 weeks. You observe that plants grown in ammonium nitrate and 16 hours of light grow taller than no ammonium nitrate and 8 hours of light. Ammonium nitrate is

A molecule.

You perform an experiment in which you take 16 pots of strawberry plants and give half of them 1 gram of ammonium nitrate per liter of water and the other half receive only water. Each group is then split in half again, and exposed to either 8 or 16 hours of light each day. You monitor the height of the plants for 4 weeks. You observe that plants grown in ammonium nitrate and 16 hours of light grow taller than no ammonium nitrate and 8 hours of light. In this experiment, the size of the pot is

A standardized variable.

Which of the following is NOT a characteristic common to life?

Ability to change their local environment.

You perform an experiment in which you take 16 pots of strawberry plants and give half of them 1 gram of ammonium nitrate per liter of water and the other half receive only water. Each group is then split in half again, and exposed to either 8 or 16 hours of light each day. You monitor the height of the plants for 4 weeks. You observe that plants grown in ammonium nitrate and 16 hours of light grow taller than no ammonium nitrate and 8 hours of light. Which of the following is/are independent variable(s) in this experiment?

Amount of ammonium nitrate and light.

Asexual reproduction differs from sexual reproduction in that

Asexual reproduction produces offspring containing DNA from only one parent.

What level of biological organization is illustrated by the image? Click on the correct box.

Community

In the tutorial, an experiment examining the effects of water temperature on coffee taste was discussed, and the results are shown below. Specifically, coffee was brewed at three different water temperatures, and its taste was assessed by a bitterness score. According to this graph, what brewing temperature produced the least bitter coffee?

Cool.

Which of the following is always present in a well-designed experiment to test a hypothesis? (Select all that apply.)

Dependent variable. Placebo with an inactive ingredient. Small sample size.

What level of biological organization is illustrated by the image? Click on the correct box.

Ecosystem

Homo sapiens is in which domain?

Eukarya

A species is classified into one of three domains called plant, animal or protist.

False.

You perform an experiment in which you take 16 pots of strawberry plants and give half of them 1 gram of ammonium nitrate per liter of water and the other half receive only water. Each group is then split in half again, and exposed to either 8 or 16 hours of light each day. You monitor the height of the plants for 4 weeks. You observe that plants grown in ammonium nitrate and 16 hours of light grow taller than no ammonium nitrate and 8 hours of light. Which of the following is/are dependent variable(s) in this experiment?

Height of the plants

You are sorting cards with pictures of organisms and their descriptions into groups You would place the card with an osprey and the description "organisms that obtain energy by consuming other organisms" with cards for other

Heterotrophs.

If you observed a newly discovered 'thing' and tried to decide if it might be alive, what would be the weakest distinction for life?

Movement.

A structure consisting of tissues organized carry out a specific function defines a(n)

Organ.

What aspect of this graph shows that the difference in bitterness scores for very hot water and cool water is not due to random chance?

The very hot bar on the graph has an asterisk above it.

If you wanted to test whether or not a particular pain reliever was effective in the general population, you would need to design an experiment with an experimental group and a control group. What should be the only difference between these two groups?

Treatment: The experimental group should get the pain reliever, and the control group should get a placebo

Natural selection is a mechanism of evolution that selects for adaptations or inherited characteristics that enable an organism to survive and reproduce successfully in its environment.

True.