What are the 7 characteristics of life? correct answers 1. Contains Macros
2. Composed of cells
3. Reproduces
4. Use energy/raw materials
5. Respond to stimuli
6. Homeostasis
7. Adaptation/Evolution
What does structure determine? correct answers structure determines function
What are th...
BIL 150 - Van Dyken (Exam 1) A+ GRADED
SOLUTIONS.
What are the 7 characteristics of life? correct answers 1. Contains Macros
2. Composed of cells
3. Reproduces
4. Use energy/raw materials
5. Respond to stimuli
6. Homeostasis
7. Adaptation/Evolution
What does structure determine? correct answers structure determines function
What are the 5 unifying themes of biology? correct answers 1. Organization
2. Information
3. Energy
4. Interactions
5. Evolution
What are the levels of biology? correct answers atoms, molecules, organelles, cells, tissues,
organs, organisms, population, community, ecosystem, biosphere
What are emergent properties? correct answers New properties that arise with each step
upward in the hierarchy of life, owing to the arrangement and interactions of parts as
complexity increases.
Prokaryote traits/tendencies? correct answers Small, ribosomes, unicellular, no nucleus
What is the unity among organisms? correct answers DNA
What is negative feedback? correct answers A response to a change in the body that
counteracts or opposes the initial change.
What is positive feedback? correct answers Feedback that increases the output of a process.
1 astronomical unit correct answers The distance from the Earth to the Sun
Atoms are mostly what? correct answers empty space
Do electrons ever go in the nucleus? correct answers Yes, but their speed/momentum keeps
them from staying there
What is the tennis ball/period visualization? correct answers If a proton was the size of a
tennis ball, an electron would be the size of a period five football fields away
Why is the ring diagram wrong? correct answers Electrons don't move in perfect circles like
that, they move in clouds really fast
, How many naturally occurring elements are there? correct answers 92
How many naturally occurring do we use? correct answers 20-25 percent of them
What are isotopes? correct answers Atoms of the same element with different numbers of
neutrons
What do radioactive isotopes do? correct answers decay spontaneously, giving off particles
and energy
What is electronegativity? correct answers ability of an atom to attract electrons
What does electronegativity determine? correct answers type of bond (ionic or covalent)
How many electrons can the first shell hold? correct answers 2 electrons
How many electrons can the second/third shell hold? correct answers 8 electrons
Why Oxygen and not Fluorine? correct answers Oxygen is much more abundant and can
form more bonds than Fluorine can
What makes up 96% of living matter? correct answers CHNOPS (Carbon, Hydrogen
Nitrogen, Oxygen, Phosphorus, and Sulfur)
What do strong acids like HCl do in water? correct answers Disassociate fully
Talk about each shell and its energy levels correct answers Electrons are lazy, they want to be
at the lowest level shell possible, as the higher you go in shell number, the more energy the
shell has
What do electrons give off when dropping energy levels? correct answers Heat
What does is the behavior of at atom determined by? correct answers Its valence electrons
Describe a covalent bond correct answers Covalent bonds share electrons between atoms
(ex: H20 or water), the strongest are nonpolar covalent (H2)
Describe ionic bonding (usually salts) correct answers Ionic bonds are when an atom lends
one or more electrons to another atom to satisfy both of their outer energy levels. For
example, Sodium and Chlorine form an ionic bond because Sodium lends an electron to
Chlorine to fill Chlorine's outer level of electrons so it has 8 and gets rid of the one extra
electron in Sodium so it only has a satisfied 8 valence electrons instead of 1 unsatisfied
valence electron.
How do you determine if a bond is ionic or covalent? correct answers The difference in
electronegativity must be more than 2
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