Hypotheses, Theories, and Laws

Which occurs directly before forming a hypothesis? proposing a law drawing a conclusion developing a testable question analyzing experimental data

developing a testable question

How does a law differ from a theory? A law is a theory that has been proven to be true and universal. A theory is a group of hypotheses that prove a law is true. A law is a statement of fact, but a theory is an explanation. A theory is a proposed law that has not yet been peer reviewed.

A law is a statement of fact, but a theory is an explanation.

A testable hypothesis could be formed from which question? Are bass more active in the daytime than at night? When whales jump out of water, are they happy? Are red tulips prettier than tulips of other colors? Why are gerbils more popular as pets than hamsters are?

Are bass more active in the daytime than at night?

In the early days of germ theory, contagious diseases were thought to be caused by fungi or bacteria. In the 1890s, Dmitri Ivanovski filtered extracts from diseased tobacco plants and discovered that the disease could be transmitted to new plants through the filtrate. He concluded that the disease was caused by particles smaller than bacteria: the tobacco mosaic virus. Which best explains how Ivanovski's work led to a change in the germ theory? He tried to promote his hypothesis as a law. He used a new experimental method to test his hypothesis. He used a more powerful bacterial strain than other scientists had. He obtained results that confirmed what other scientists were thinking.

He used a new experimental method to test his hypothesis.

In which situation would new technology be most likely to cause a change in an existing theory about new structures a cell? The new technology makes it possible to detect and analyze a structure more rapidly. The new technology allows scientists to confirm the presence of an existing structure in a cell. The new technology makes it possible to produce additional structures that were not previously there. The new technology allows detection of a structure that could not be detected previously.

The new technology allows detection of a structure that could not be detected previously.

Gregor Mendel demonstrated that traits are passed from parents to offspring independently of one another under all circumstances that he tested. All other genetics researchers have observed this as well. Based on this information, the statement "traits are passed from parents to offspring independently of one another" is a law. a hypothesis. a theory. an observation.

a law

Gregor Mendel was the first scientist to use statistics to analyze scientific data. Before Mendel's experiments, scientists believed that organisms acquired traits from their environment and passed them on to their offspring. After Mendel's discoveries were accepted, scientists realized that traits passed to offspring were the result of genes being passed from parents to offspring. This is an example of: a theory changing because a new scientific method was developed. a law changing because a new scientific method was developed. a hypothesis changing because a new scientific method was developed. an observation changing because a new scientific method was developed.

a theory changing because a new scientific method was developed.

How should you test a hypothesis? by writing a mathematical equation by making a single observation by performing a controlled experiment by answering a series of questions

by performing a controlled experiment

Which is the correct order in the scientific process? ask a question ® form a hypothesis ® make an observation ask a question ® make an observation ® form a hypothesis make an observation ® form a hypothesis ® ask a question make an observation ® ask a question ® form a hypothesis

make an observation ® ask a question ® form a hypothesis

What do hypotheses, theories, and laws have in common? data predictions explanations observations

observations

The development of a new experimental method is most likely to change a theory if it makes it possible to: analyze samples when they are frozen. perform the experiment in a different lab. obtain and analyze results more quickly. study a larger sample size than before.

study a larger sample size than before.