1.1 The study of life Read Online
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.
Question: which is the correct sequence for levels of biological organization occuring beyond the individual
Choices:
population, ecosystem, community, biosphere
population, community, ecosystem, biosphere
community, population, ecosystem, biospher
ecosystem, population, biosphere, community
Question: the process of (blank) helps to ensure that a scientist's research is original,significant, logical, and thorough
Choices:
publication
public speaking
scientific method
peer review
Question: if an atom has a valence shell that is full it
Choices:
is highly reactive
it is not chemically stable
it is chemically stable
is highly likely to combine with other atoms
is not inert
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?
Choices:
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
Choices:
Carbohydrates, lipids, proteins, and nucleic acids
fats, waxes, carbohydrates, and amino acids
carbohydrates, lipids, steroids, amd monosaccharides
lipids, fats, waxes, and steroids
Question: what is not a required characteristic of life
Choices:
structural organization
evolution
homeostasis
movement
energy use
Question: atoms that vary in the number of neutrons found in their nuclei are called
Choices:
ions
isotopes
neutrons
neutral atoms
Question: Elements are
Choices:
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: what is the correct sequence of some of the steps in the scientific method?
Choices:
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: an acid
Choices:
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: A suggested and testable explanation for an event is called
Choices:
theory
control
hypotheses
variable
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