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Photo depicts Earth from space.
This NASA image is a composite of several satellite-based views of Earth. To make the whole-Earth image, NASA scientists combine observations of different parts of the planet. (credit: NASA/GSFC/NOAA/USGS)

Viewed from space, Earth offers no clues about the diversity of life forms that reside there. The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 200 million years ago. Humans have inhabited this planet for only the last 2.5 million years, and only in the last 200,000 years have humans started looking like we do today.

Test PDF eBook: 
Exam 1
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42 Pages
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Educational Materials

Sample Questions from the Exam 1 Test

Question: atoms that vary in the number of neutrons found in their nuclei are called





neutral atoms

Question: if an atom has a valence shell that is full it


is highly reactive

it is not chemically stable

it is chemically stable

is highly likely to combine with other atoms

is not inert

Question: what is the correct sequence of some of the steps in the scientific method?


Observation, form hypothesis, design an experiment, collect data

observation, form hypothesis, draw conclusion, design experiment

observation, draw a conclusion, design an experiment,form hypothesis

form hypothesis, observation,design an experiment, collect data

Question: Elements are


unique forms of matter with specific chemical and physical properties that cannot be broken down into smaller substances

any substance that occupies space

any substance that has mass

the fundamental level of life

all of these answers are correct

Question: which is the correct sequence for levels of biological organization occuring beyond the individual


population, ecosystem, community, biosphere

population, community, ecosystem, biosphere

community, population, ecosystem, biospher

ecosystem, population, biosphere, community

Question: what is not a required characteristic of life


structural organization




energy use

Question: the process of (blank) helps to ensure that a scientist's research is original,significant, logical, and thorough



public speaking

scientific method

peer review

Question: A suggested and testable explanation for an event is called






Question: an acid


has a value above seven on the pH scale

is a chemical that takes hydrogen ions from a solution

has a value of seven on the pH scale

is a chemical that adds hydrogen ions to a solution

All are correct

Question: you preform an experiment in which you take 16 pots of strawberry plants and give half of them 1 gm of ammonium nitrate per liter of water and the other half just water. each group is then split in half again, and exposed to either eight or 16 hours of light each day. You monitor the height of the plants for four weeks. You observe that increasing ammonium nitrate and light both increases plant height. Which of the following are independent variables in this experiment?


the amount of ammonium nitrarte

the amount of ammonium nitrate and light

the amount of light

the height of the plants and the amount of light

the height of the plants

Question: the four major groups of organic compounds are


Carbohydrates, lipids, proteins, and nucleic acids

fats, waxes, carbohydrates, and amino acids

carbohydrates, lipids, steroids, amd monosaccharides

lipids, fats, waxes, and steroids

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