BIOS 100 Midterm Chapter 1

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BIOS 100 Midterm Chapter 1

• The bird species switches from song to warning call whenever it sees a potential predator:

Answer A scientist observes that when she opens the back door of her house to let her cat out the songs of a certain species of birds rapidly change. She wants to follow up on her best observations with an informal experiment. Which of the following is the best hypothesis for explaining the birds song changes?

• Each time the scientist let her cat outside the birds abruptly change their songs:

Answer A scientist wants to test the hypothesis that a certain bird species in her backyard changes it songs to warning calls whenever it detects the presence of a potential predator.Which of the following most likely describes her initial observa- tions?

3. Conducting experiments:

Answer The attempt to disprove a hypothesis is accomplished by which of the following tasks?

• He is missing a control group of mice I did not receive the new antibiot- ic:

Answer The scientist wishes to test a new antibiotics ability to treat stubborn bacterial infections. He test his hypothesis that the antibiotic works better than existing treatments by giving bacterial infections to mice and treating them with the antibiotic. He then determines how many of them recover from their infections what is missing from his experimental design?

• She is missing a control group of mice that did not receive the new chemi- cal:

Answer A scientist wants to determine whether a new chemical she isolated can cure a certain disease.To test her hypothesis that the new chemical cures the disease more Effectively than current treatments, she infects mice with a disease and gives them the new chemical. She then assesses how many mice were cured of the disease what is missing from her experimental design?

6. The creature's body is bilaterally symmetrical:

Answer A scientist believe that she has found a new life form. Which of the following conditions is not considered essential in determining whether the putative new life form is alive?

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