AnswersBiology - Semester 1 PathwaysLaboratory Safety

Laboratory Safety — Unit test Answers

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Which description indicates that a question is nonscientific?

A
The question has a narrow focus.
B
They question leads to a testable hypothesis.
C
The question addresses a gap in knowledge.
D
The question relies on moral or social values.
2
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Tara sees a commercial for a brand of pills that promise to boost energy and help people perform better in work and school. As people in the commercial talk about how much better they feel when taking the pill, Tara notices a message on the bottom of the screen that reads, "This pill is not approved by doctors and has not been tested in controlled experiments.”

A
It is making scientific claims based on subjective observations.
B
It is making scientific claims based on opinions instead of pseudoscientific facts.
C
It is making pseudoscientific claims based on objective observations.
D
It is making pseudoscientific claims based on opinions instead of scientific facts.
3

The scientist Konstantin Mereschkowsky knew in the early 1900s that plants make their own food by using sunlight. He also saw tiny parts in plants called chloroplasts that do not appear in any animals. He hypothesized that chloroplasts are what help plants make food. After many more observations of all types of plants and animals, scientists are convinced today that chloroplasts make food for plants.

A
scientific, because a hypothesis and observations were made and then a conclusion was drawn
B
scientific, because scientists made a hypothesis and conclusion before making any observations
C
pseudoscience, because a hypothesis was believed to be true before any observations were made
D
pseudoscience, because beliefs in chloroplasts are based on subjective opinions
4

In what way do investigations build scientific knowledge?

A
The results of investigations lead to questions that cannot be tested.
B
They reflect the opinions and social values of scientists, ensuring valid information.
C
The results of investigations lead to new questions, which lead to new investigations.
D
They are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.
5

A scientist asked a question that was based on an observation. What should the scientist do next?

A
The scientist should form a hypothesis and design an experiment.
B
The scientist should collect data and organize it into tables.
C
The scientist should draw conclusions based on the observation.
D
The scientist should record and communicate his hypothesis and results.
6

How can a liquid be drawn into a pipette safely?

A
by squeezing and releasing a bulb attached to the wide end of the pipette
B
by gently sucking the wide end of the pipette until the liquid rises up
C
by using a beaker to pour the liquid into the pipette
D
by using an eyedropper to drip the liquid into the pipette
7

In the 1700s, Isaac Newton determined that the force of gravity between two objects depends on the mass of the objects and distance between them. He reasoned that things fall toward Earth because it has so much mass. Then in the 1900s, Albert Einstein worked with new discoveries, such as the fact that light always travels the same speed, and he determined a new explanation of how and why gravity works. Mass and distance still matter in Einstein’s explanation, but speed also matters. Newton’s explanation still works for objects close to Earth, but Einstein’s explanation works for all of the objects in the universe.

A
When new scientists have different beliefs than older scientists, they will search for new facts.
B
All scientists can observe the same facts and determine different explanations about them.
C
If scientists establish explanations based on data, then the explanations are true and do not need to be changed.
D
Scientists make improved explanations by building on old ideas and working with new data.
8

Dani wants to measure the volume of a pebble. Which tool will give the most accurate measurement?

A
a ruler
B
a tablespoon
C
a measuring cup
D
a graduated cylinder
9

A small amount of chemical splashes in Frank’s eye. What should Frank do immediately?

A
ask if anyone knows how to use the lab’s eyewash station.
B
tell his lab partner that he is going to the school nurse’s office.
C
raise his hand to ask for permission to use the eyewash station.
D
use the eyewash station while his lab partner informs the teacher.
10

Which most accurately describes the basis of the scientific method?

A
a path of clearly defined steps that must be followed in a particular order
B
a possible answer to a scientific question based on knowledge or research
C
the recipe for how to conduct an experiment that must be followed precisely
D
the process of hypothesis and testing through which scientific inquiry occurs
11

Scientists recently identified the function of three proteins in plants. The proteins regulate the production of fatty acids, which are found in fats and oils. Which question will most likely be asked about the results, leading to more investigations?

A
How are proteins produced?
B
Are the plants nonrenewable resources?
C
How much energy do fatty acids produce when they are burned as fuel?
D
How can the proteins be used to increase the amount of oil produced by a plant?
12

What does the prefix pseudo mean in the word pseudoscience?

A
false
B
subjective
C
systematic
D
factual
13

Megan collected data about the trees in the park near her school. She determined that white oak, bur oak, ash, sycamore, and maple trees were the only trees that grew in the park. The pie chart below shows most of her data. Which label should Megan add to complete her chart?

Question illustration
A
Maple, 19%
B
Maple, 29%
C
Maple, 39%
D
Maple, 49%
14

What is the primary purpose of writing a lab report?

A
to summarize the rules of the laboratory to the students who will use it
B
to communicate the specifics of an experiment that was conducted
C
to record observations in an organized format during the experiment
D
to record which days a student worked in the laboratory
15

A scientist publishes a paper that states that changes in the levels of gases in the atmosphere of a moon of Saturn indicate that there may be extraterrestrial life on that moon. Which statement correctly answers whether the question of alien life on this moon is scientific?

A
The question is not scientific because it cannot be tested.
B
The question is scientific because it deals with astronomy.
C
The question is not scientific because it involves alien, extraterrestrial life.
D
The question is scientific because it is testable and verifiable.

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