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NAT SCI Exam 1 | Questions & Answers, Practice Test, Study Guide & Revision Notes | Latest 2026 PDF

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Prepare for NAT SCI Exam 1 with this focused study resource featuring exam-style questions, answers, and key natural science review material. Ideal for efficient revision, practice testing, strengthening subject knowledge, and building exam readiness for the 2026/2027 academic year.

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NAT SCI Exam 1

What is name given to scientific study of life? Biology




Olestra Potato Chip Experiment: the variable
What is Olestra?



Olestra Potato Chip Experiment: Experimental Group
Who were the subset of people who got the Olestra-
containing chips?


Olestra Potato Chip Experiment: Conclusion
"percentages are about equal. Therefore, Olestra is not the
cause of intestinal cramps observed in some people who
have ingested Olestra-containing food." What is that?


An ecosystem is made up of? organisms and non-living things




What are lipids, proteins, DNA, RNA, and complex molecules
carbohydrates?



What level does the emergent property of "life" appear at; Cell
where many molecules become organized?



What is all regions of Earth where organisms live? biosphere




What is two or more atoms bonded together? molecule




What is the fundamental building block of all matter? atom




What is an individual that consists of one or more cells? organism




What is a substance that an organism needs for growth nutrient
and survival but can't make for itself?



What is the process by which the first cell of a new development
individual becomes a multicelled adult called?



What is homeostasis? the ability to sense and respond to change




Which group of organisms are the most diverse bacteria and archaea
representatives of life?

, NAT SCI Exam 1

What base do taxonomists tend to group organisms into biochemical traits
the same category?



In the scientific name, Pan paniscus; what does Pan Pan-genus; paniscus- species
represent and what does paniscus represent?



Which of the following organisms is a multi-celled oak tree
producer?



What is this single-celled or multicelled eukaryotic fungi
consumer that breaks down material outside itself, then
absorbs nutrients released from the breakdown.


What is the group that have no nucleus and are the most bacteria
numerous organisms on Earth?



What group is often found in extreme environments while archaea
having no nucleus, these organisms are closer genetically
to eukaryotes?


What does statistically significant mean? There is a very low probability that the difference in grades between the two groups
was due to chance or sampling error (usually less than 0.05)



The variables in the 2005 peacock butterfly experiment butterfly wing pattern color and sounds emitted
were



What is a control group an untreated group of individuals or subjects




Experimenter wanted to test effects of cigarette smoking control group
on rats. Infused cages of 50 rats with smoke and 50 with
clean air. What group were the rats that received clean air?


What is the difference between the results obtained from a sampling error
subset and results obtained from the whole?



What practice helps scientists avoid bias in their findings? publicly publishing their results




What is a theory? an explanation that is well documented and consistent with the evidence




What is a scientific theory? if a hypothesis stands after years of repeated testing, is consistent with data
gathered and helps make successful predictions



What is the Copernican model? the idea that Earth orbits the sun

, NAT SCI Exam 1

The current rate of extinction is about how many times 1000
faster than normal?



Olestra Potato Chip Experiment: observation
What is "some people complained of intestinal problems
after eating chips containing Olestra."


Olestra Potato Chip Experiment: Experiment
What is "1,100 people between the ages of thirteen and
thirty-eight were asked to watch a movie and eat potato
chips"


Which of the organization levels is the least inclusive? atom




What is a basic component of all the others? cells




What is an activity within a population? a peacock spreading and shaking his feathers to attract a female




What is a group of interbreeding individuals of the same population
species that live in a given area?



What is a community interacting with its environment? ecosystem




What is the smallest unit of life? cell




What is the category of organisms that get their energy consumers
and nutrients by feeding on tissues, wastes, or remains of
other organism?


What is the transmission of DNA to offspring? inheritance




Which level of taxonomy encompasses all of the others? class




What is the correct order of taxa from most inclusive to domain, kingdom, phylum, class, order, family, genus, species
least inclusive?



What was Ernst Mayr responsible for? describing the biological species concept




What are the simplest types of eukaryotes? protists

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