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15 Cards in this Set

  • Front
  • Back
Life is organized in hierarchial fashion. Which of the following sequences illustrates that hierachy as it increases in complexity? (9)
molecule, cell, tissue, organ, organ system, organism, population, community, ecosystem
A hypothesis is...?
A tenative explanation for a specific phenomenon
A scientist performs a controlled experiment. This means that...?
two experiments are conducted, one differing from the other by only a single variable
The Role of a control in an experiment is to...?
provise a basis of comparison with the experimental
An antibiotic kills 99.9% of a bacterial population. You would expect the next generation of bacteria...?
to be more resistant to the antibiotic
Which of the following statements is/are true?
1) Ecosystems interact; thus it is possible for events occuring in tropical rain foreses to influence North America weather patterns

2) Understanding carbon and water cycling is an important aid in the understaing of global climate patterns

3)CO2 emission is an important contributor to global warming
The five most common elements in living organisms are...?
C, H, O, N, P
1) occupies space

2) is what live is composed of

3)is composed of elements

4)has mass
A compound...?
contains two or more elements in a fixed ratio
The nucleus of an atom contains...?
protons and neutrons
The atom sodium contains 11 electrons, 11 protons, and 12 neutrons. What is the mass number of sodium?
When full, the innermost electron shell of an atom contains ___ electrons, and the outermost shell conatins ___ electrons.
What is the fundamental difference between covalent and ionic bonding?
In a covalent bond, the partners share a pair of electrons; in an ionic bond, one partner captures and electron from the other.
The oxygen atoms of each water molecule...
are more electronegative than the hydrogen atoms
A water molecule (H-O-H) is held together by..?
a polar covalent bond