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Praxis Biology Exam (5235) |Questions Solved 100% Correct Answers| Already Passed
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Praxis Biology Exam (5235) |Questions Solved100% Correct Answers| Already Passed
How did Hershey and Chase determine DNA - ANSWER injected phage DNA and protein. Saw
that the DNA was transferred into the bacteria
Classification of organisms - ANSWER
Relationship among domains - ANSWER
Historical figures in classification of organisms - ANSWER - Linnaeus: father of
modern taxonomy.
- Woese: defined the Archea by using 16s ribosomal RNA
Difference between precision and accuracy - ANSWER - Accuracy refers to the closeness of a
measured value to a standard known value
- Precision refers to the closeness of two or more measurements to each other
Significant figure rules - ANSWER i. Non-zero digits are always significant; 1.121 has four
significant digits.
ii. Any zeros between two significant digits are significant; 1.08701 has six significant digits.
iii. Zeros before the decimal point are placeholders and not significant; in the number .00254,
only the 2,5 and 4 are significant, meaning the number has 3 significant figures.
iv. Zeros after the decimal point and after figures are significant; in the number 0.2540, the 2,
4, 5 and last 0 are significant.
,v. Exponential digits in scientific notation are not significant; 1.12x106has three
significant digits, 1, 1, and 2.
What is a trend? - ANSWER data move in one direction
What are patterns - ANSWER data repeats in a predictable way
types of experimental errors - ANSWER -systemic
errors -random errors
Limitations on scientific models - ANSWER they are usually simplified versions of the real
situation or concept
Difference between logistic and exponential growth - ANSWER Exponential growth: J curve.
population keeps growing
Logistic growth: S curve. population slows down when they hit K
Molarity = - ANSWER mol of solute/L of solution
How to dispose of acidic substances - ANSWER add a base before disposing
Organic vs. Inorganic molecules - ANSWER -Organic molecules: contains Carbon, Hydrogen and
Oxygen.
-Inorganic molecules: Does not contain C,H and O at the same time
What are the 4 organic molecules - ANSWER Carbohydrates
Lipids
Nucleic Acids
,Proteins
What is a polar bond - ANSWER an intermediate case between ionic and covalent bonding. One
end of the molecule is slightly negative and the other end is slightly positive
What is hydrogen bonding - ANSWER where the hydrogen atom of one H20 molecule is
slightly electropositive and the oxygen atom is slightly electronegative
What are the properties of water? - ANSWER high specific heat
high heat of vaporization
universal solvent
high surface tension
cohesion and adhesion
insulator and density
Difference between adhesion and cohesion - ANSWER Cohesion: water bond to water
Adhesion: water bond to anything else
What are the 4 macromolecules - ANSWER Carbohydrates
Nucleic acids
Proteins
Lipids
What are carbohydrates - ANSWER - biological molecules make of carbon, hydrogen and
oxygen.
Types of carbohydrates - ANSWER Monosacchrides (simple sugars like glucose)
Disaccharides (lactose)
, Polysaccharides (start, glycogen)
What are nucleic acids - ANSWER -made out of units called nucleotides
-two naturally occurring varieties (DNA and RNA)
What are proteins - ANSWER Made of chains of amino acids
What lipids - ANSWER -inability to mix well with water
-mostly made of hydrocarbon chains
-Fats
What is osmosis - ANSWER -movement of water through a semipermeable membrane to
a higher concentration of solutes
-passive transport
What is passive transport - ANSWER -transport that does not require energy
-
What is active transport - ANSWER -transport that requires energy
-larger molecules
What is diffusion - ANSWER -movement of molecules from region of higher concentration
to region of low concentration
-passive transport
What is facilitated diffusion - ANSWER -movement of molecules or ions across the cell
membrane from higher concentration to low concentration
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