Biology Homework Chapter 1
A research team designs an experiment to increase the speed of athletes. The athletes' diet and sleep routines are altered for two weeks. Is this an example of a controlled study?
No. A controlled study only changes one variable at a time.
What is the main difference between an ecosystem and a community?
A community consists of living organisms only, while an ecosystem consists of both living organisms and their nonliving environment
What does the term theory mean to a scientist?
A hypothesis that has been supported by a large number of experiments
What is the difference between a primary and a secondary source?
A primary source is the original material published by the scientists, whereas a secondary source is a description of the original material.
Is a virus considered alive?
No, it does not possess all of the requirements for life.
Which of the following lists the steps of the process of science in correct order?
Observation, communications, testing, and outcomes....Any of the above are correct.
Many medical studies show that patients who receive a treatment feel better even if the treatment was an ineffective sugar pill. What is this phenomenon called?
The placebo effect
Which of the following represents a blind study?
The test group does not know whether they are receiving a placebo or the actual treatment, but the researchers do.
Why are viruses NOT considered to be living organisms?
Viruses do not have their own cells, and they do not reproduce on their own.
A population consists of ________.
a group of interacting individuals of one species
A college campus including the students, birds, trees, sidewalks, and air makes up one complete ________.
ecosystem
Scientific Method
is a rough recipe for answering questions, but the steps need not always need to be performed in the same order
Each spring, high school students, college interns, and retirees count and weigh tiny glass eels in streams that feed into the Hudson River. They report their observations to the New York State Department of Environmental Conservation Hudson River Estuary Program and the National Estuarine Research Reserve System, who depend on volunteers to help build a database of information about glass eels. The observations that these volunteers make would best be described as __________.
observational studies
A controlled experiment is one in which ________.
there are at least two groups, one of which does not receive the experimental treatment
