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Pregunta 1
Pregunta
Though scientists strive to be "purely objective", they:
Respuesta
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Can't avoid being subjective
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Have their own perspective or points of view
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Are not neutral because of their having grown up in a particular aspect of society at a certain time
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All of these statements are true
Pregunta 2
Pregunta
A valid experiment:
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Always supports the hypothesis
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Does not have to be repeatable
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Includes both experimental and control treatments
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All of these statements are true
Pregunta 3
Pregunta
Which of the following situations can be studied by using the scientific method?
Respuesta
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Buying an air conditioner
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Determining the effect of light on a frog
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Finding the cause of static on your favorite radio station
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All situations can be investigated
Pregunta 4
Pregunta
Adaptations:
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Are short-lived
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Result from the processes of mutation and natural selection
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Decrease an organism's ability to survive in a particular environment
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Affect only an organism's physiology
Pregunta 5
Pregunta
You are testing the effect of sugar on the freezing point of water. Your experimental setup is indicated below.
Beaker: Solution (20 mLs per beaker):
A 1% sugar
B 5% sugar
C 10% sugar
D 1% salt
You place the beakers in the freezer for one hour. You examine them and conclude that your experiment is invalid because:
Respuesta
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Your sample of 20 mLs is too small
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You didn't include a control
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You didn't include beakers with 10% and 5% salt solution
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You didn't repeat the experiment three times
Pregunta 6
Pregunta
Observations may:
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Provide a large amount of scientific data
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Allow for personal bias to enter a scientific investigation
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Form the bases of a scientific theory
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All situations are true
Pregunta 7
Pregunta
Which of these characteristics of life takes the longest time?
Respuesta
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Metabolism
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Growth
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Evolution
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Reproduction
Pregunta 8
Pregunta
An atom of magnesium has an atomic number of 12. How many electrons would be found in the third energy level?
Respuesta
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1
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2
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5
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6
Pregunta 9
Pregunta
Electrons:
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Are randomly distributed around the nucleus
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Are major contributors to the atomic weight
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Have a negative charge
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Do not participate in chemical bonds
Pregunta 10
Pregunta
The atomic number of oxygen is 8. Oxygen 16 and oxygen 18 are isotopes. They have:
Respuesta
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The same number of neutrons
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Different numbers of negatively charged particles
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The same atomic mass
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The same number of electrons in the outer shell
Pregunta 11
Pregunta
When an atom with seven electrons in the outer shell picks up another one, the atom becomes:
Respuesta
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An isotope
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A negatively charged ion
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A positively charged atom
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Radioactive
Pregunta 12
Pregunta
The transfer of electrons between two atoms occurs in a(n)
Respuesta
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Covalent bond
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Ionic bond
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Hydrogen bond
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All situations are true
Pregunta 13
Pregunta
The atomic # of an element is 10. This element would most likely:
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Form ionic bonds
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Be unreactive
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Form covalent bonds
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Can't tell from the information given
Pregunta 14
Pregunta
The chemical processes in the living cell are collectively called:
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Adaptation
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Homeostasis
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Evolution
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Metabolism
Pregunta 15
Pregunta
Radioactive isotopes:
Respuesta
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Are electrically unbalanced
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Are produced when substances are exposed to radiation
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Undergo rearrangements and emit radiation in the process
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Only undergo rearrangements when bombarded with particles
Pregunta 16
Pregunta
In science, a hypothesis that is not rejected after repeated tests is called:
Respuesta
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An experiment
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A hypothesis
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A theory
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True
Pregunta 17
Pregunta
Which of the following best describes the logic of the scientific process?
Respuesta
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If I generate a testable hypothesis, tests and observations will support it.
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If my prediction is correct, it will lead to a testable hypothesis.
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If my tests are set up right, they will lead to a testable hypothesis.
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If my hypothesis is correct, I can expect certain test results.
Pregunta 18
Pregunta
The epigenetic identical twin mice demonstrate how:
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Identical twins always look identical
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Identical twins raised in different environments look different
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Living organisms are products of their genes and the genes' environments
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All situations are true
Pregunta 19
Pregunta
Inorganic compounds:
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Always contain carbon
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Often contain ionic bonds
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Include carbohydrates, lipids, proteins, and nucleic acids
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Are usually very large
Pregunta 20
Pregunta
Which of the following statements is true for water?
Respuesta
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Water is a non-polar substance
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Hydrogen bonds join two hydrogen atoms to the oxygen atom
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In the molecule, the hydrogen atoms have a partial negative charge
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In the molecule, the hydrogen atoms have a partial positive charge
Pregunta 21
Pregunta
The fact that water can maintain a constant temperature well is because it has a:
Respuesta
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High heat of vaporization
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High specific heat
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Low freezing point
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Non-polar nature
Pregunta 22
Pregunta
Which of the following is (are) due to the fact that H2O molecules hydrogen bond to each other in liquid water?
Respuesta
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High heat of vaporization
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High surface tension
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High specific heat
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All situations are true
Pregunta 23
Pregunta
Because ice expands upon forming:
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Ice is denser than liquid water
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Water isn't a very good solvent
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Ponds freeze from the top down
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All situations are true
Pregunta 24
Pregunta
A pH of 10 is how many times as basic as a pH of 7?
Respuesta
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3
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10
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100
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1000
Pregunta 25
Pregunta
A reaction of an acid and a base will produce water and:
Respuesta
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Gas
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A salt
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Solute
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Solvent
Pregunta 26
Pregunta
In water, H2CO3 dissociates into H+ and HCO3-. This compound, H2CO3, is behaving as a(n):
Respuesta
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Base
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Buffer
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Acid
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Salt
Pregunta 27
Pregunta
Most life processes take place at a pH of:
Respuesta
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3 to 4
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4 to 6
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6 to 8
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8 to 12
Pregunta 28
Pregunta
Which is true about the pH scale?
Respuesta
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It is linear
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It defines the degree of acidity or basicity of a solution
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It is expressed with numbers 1-12
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All situations are true
Pregunta 29
Pregunta
Scientific facts cannot be disputed.
Respuesta
- True
- False
Pregunta 30
Pregunta
Carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur constitute less than 75% of the composition of living organisms.
Respuesta
- True
- False
Pregunta 31
Pregunta
The remains of organisms found in geologic formation are called fossils.
Respuesta
- True
- False
Pregunta 32
Pregunta
The Daddy water bugs story was used to illustrate how the sociocultural framework of scientists can limit their vision.
Respuesta
- True
- False
Pregunta 33
Pregunta
The power of human belief systems is such that even our immune system response can be modified by previous conditioning.
Respuesta
- True
- False
Pregunta 34
Pregunta
The bonds in methane (CH4) are ionic.
Respuesta
- True
- False
Pregunta 35
Pregunta
PET scans are used medically to see activity in the body after a person is given radioactive tracers.
Respuesta
- True
- False
Pregunta 36
Pregunta
Critical thinking involves examining the big picture and questioning methodology, results, and conclusions.
Respuesta
- True
- False
Pregunta 37
Pregunta
Heavy hydrogen, an isotope of hydrogen, differs from the regular atom in its charge.
Respuesta
- True
- False
Pregunta 38
Pregunta
Homologous structures look alike in different lineages but evolved independently.
Respuesta
- True
- False
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