BIO 191 UNLV EXAM TWO STUDY GUIDE
2026 QUESTIONS WITH ANSWERS GRADED
A+
⩥ 10 characteristics of life. Answer: 1) Atoms/Molecules (highly
complex)
2) Organelles -> Cells -> Tissues
3) Grow/ Reproduce (unicellular, multicellular)
4) DNA genetic information (chem. gen. info)
5) DNA can change (mutation)
6) Energy - obtained -> used ... eg. respiration (metabolism -all chem.
reactions)
7) Coordination- regulation (nervous system, hormone system)
8) Homeostasis- keep stable (blood pressure)
9) Sensitivity to environment (nerves sensitive to heat)
10) Ecology- study of interactions
⩥ Theory. Answer: Set of very well accepted hypotheses
⩥ Hierarchical Structure of Living Systems. Answer: (Figure 1.1)
Atoms, Molecules, Macromolecules, Organelles, Cell, Tissue, Organ,
Organ system, Organism, Population, Species, Community, Ecosystem,
Biosphere
,⩥ Scientific Method. Answer: - Observations
- Hypothesis
- Experiments
- Paper (reviewed, puplished)
⩥ Main Themes in Biology. Answer: 1) Cell Theory - All living things
made of cells
2) Storage & Use of Genetic Information - Central Dogma (DNA ->
mRNA -> Protein)
3) Structure/Function - eg. Structure of cell (prokaryotic/eukaryotic)
Function (plant, animal)
4) Evolution - Change in population thru time
Natural Selection is the process! (3 things for NS to occur) 1. Reproduce
Sexually 2. Inheritiable Differences 3. Tested by some factors in
environment
5) Ecology - Study of Interactions
organism to organism
organism to environment
, ⩥ Atoms (in nucleus). Answer: - Protons (+)
- Neutrons (o)
- Electrons (-)
⩥ Atomic number. Answer: the number of protons in the nucleus of an
atom
⩥ Element. Answer: Atoms of the same chemical properties
⩥ Elements to know.... Answer: H - Hydrogen
C - Carbon
O - Oxygen
N - Nitrogen
S - Sulfur
Fe - Iron
Ca - Calcium
Na - Sodium
Cl - Chlorine
P - Phosphorus
K - Potassium
2026 QUESTIONS WITH ANSWERS GRADED
A+
⩥ 10 characteristics of life. Answer: 1) Atoms/Molecules (highly
complex)
2) Organelles -> Cells -> Tissues
3) Grow/ Reproduce (unicellular, multicellular)
4) DNA genetic information (chem. gen. info)
5) DNA can change (mutation)
6) Energy - obtained -> used ... eg. respiration (metabolism -all chem.
reactions)
7) Coordination- regulation (nervous system, hormone system)
8) Homeostasis- keep stable (blood pressure)
9) Sensitivity to environment (nerves sensitive to heat)
10) Ecology- study of interactions
⩥ Theory. Answer: Set of very well accepted hypotheses
⩥ Hierarchical Structure of Living Systems. Answer: (Figure 1.1)
Atoms, Molecules, Macromolecules, Organelles, Cell, Tissue, Organ,
Organ system, Organism, Population, Species, Community, Ecosystem,
Biosphere
,⩥ Scientific Method. Answer: - Observations
- Hypothesis
- Experiments
- Paper (reviewed, puplished)
⩥ Main Themes in Biology. Answer: 1) Cell Theory - All living things
made of cells
2) Storage & Use of Genetic Information - Central Dogma (DNA ->
mRNA -> Protein)
3) Structure/Function - eg. Structure of cell (prokaryotic/eukaryotic)
Function (plant, animal)
4) Evolution - Change in population thru time
Natural Selection is the process! (3 things for NS to occur) 1. Reproduce
Sexually 2. Inheritiable Differences 3. Tested by some factors in
environment
5) Ecology - Study of Interactions
organism to organism
organism to environment
, ⩥ Atoms (in nucleus). Answer: - Protons (+)
- Neutrons (o)
- Electrons (-)
⩥ Atomic number. Answer: the number of protons in the nucleus of an
atom
⩥ Element. Answer: Atoms of the same chemical properties
⩥ Elements to know.... Answer: H - Hydrogen
C - Carbon
O - Oxygen
N - Nitrogen
S - Sulfur
Fe - Iron
Ca - Calcium
Na - Sodium
Cl - Chlorine
P - Phosphorus
K - Potassium
