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LT 2.1 Hypothesis, Theory & Law and Cell Theory Quiz

Last updated over 1 year ago

10 questions

LT 2.1a I can differentiate among a scientific hypothesis, theory, and law.

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LT 2.1b I can provide examples of how the additions to cell theory represents Nature of Science.

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When is a hypothesis used?

 When there are no observations 

 Whenever you feel like it

 When something in the natural world is observed 

 When something cannot be tested 

Which of the following is a good example of a hypothesis?

 If a person swims 30 meters in a pool, then they are really athletic.  

 If a person can swim 30 meters in a pool, then they are really good at swimming because they swam 30 meters.  

 If a person can swim 30 meters in a pool, then that person is considered athletic because a coach told me so.

 If a person swims 30 meters in a pool, then that person has burned 10 calories, because that is how much energy is required. 

In 1897, Joseph Thomson discovered that atoms contained electrons. He proposed a change in the atomic theory of that time, and the theory was modified because of his discovery. Since Thomson’s discovery, atomic theory has been further modified. What is the best explanation for why scientific theories are modified?

So much information is available today that it is harder to focus research and disprove theories.

Theories more than ten years old are usually out of date.

New evidence that supports a change prompts scientists to modify earlier theories.

Scientists want to prove that the work of other scientists is wrong.

The law of universal gravitation states that both mass and distance of objects affect the gravitational force between them. Gravitational force increases as the mass of the objects increase. Gravitational force decreases as distance between the objects increases. Why are these statements considered scientific law, and not scientific theory?

The statements predict what will happen under certain conditions.

The statements explain the attractive force between two objects.

The statements involve mass and distance measurements.

The statements tells what happens, and not why it happens.

Lilly was trying to explain to her friend the difference between a theory and a law in science. She used the theory of plate tectonics and the law of superposition as examples. Lilli explained the difference by using non-scientific language. Which statement could 

Lilly use to correctly describe the difference between a theory and a law in science?

A theory describes a natural event, while a law explains it.

A theory explains a natural event, while a law predicts it.

A theory explains a natural event, while a law describes it.

A theory predicts a natural event, while a law explains it.

All cells contain genetic info that is passed to new cells during division

all cells come from pre-existing cells

All cells are similar in chemical composition

all organisms are made of one or more cells

All energy flow of life occurs in cells

the cell is the basic unit of life

Original Cell Theory

Modern Cell Theory

The combined observations of Mattias Schleiden, Theodor Schwann and Rudolph Virchow resulted in the formation of the cell theory. Which of the following is not part of the original cell theory?

All living organisms are made of one or more cells

All cells are the basic unit of structure and function of all living things.

Cells come from pre-existing cells

All cells contain a nucleus.

A plant and an animal are both living things. According to the Cell Theory, what can you conclude about these two very different organisms?

They both come from the same kind of cell.

They both come from a non-living organism.

Plants have cells but animals do not.

They are both made of one or more cells.

What evidence supports the claim that cells are the basic unit of all living things?

Virchow saw cells dividing.

Leeuwenhoek was good at making lenses for the microscope.

Schwann and Schleiden studied cells from many different organisms.

Robert Hooke looked at cork through the microscope and names them "cells"

A scientific theory about cells is challenged by newly discovered information from a few experiments.  As a result, what might happen to the scientific knowledge about cells?

A new theory will be immediately established

All that is known about cells will be erased

Scientific ideas may change and grow over time as new data is collected

Nothing, because scientific theories cannot change