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Biology Praxis Exam 5235 with 100% Correct Answers | Verified | Updated 2024
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Biology Praxis Exam 5235 with 100% Correct Answers | Verified | Updated 2024
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Biology Praxis Exam 5235 with 100%Correct Answers | Verified | Updated
2024
How did Hershey and Chase determine DNA ✔✔injected phage DNA and protein. Saw that
the DNA was transferred into the bacteria
Classification of organisms ✔✔
Relationship among domains ✔✔
Historical figures in classification of organisms ✔✔- Linnaeus: father of modern taxonomy.
- Woese: defined the Archea by using 16s ribosomal RNA
Difference between precision and accuracy ✔✔- 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 ✔✔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? ✔✔data move in one direction
What are patterns ✔✔data repeats in a predictable way
types of experimental errors ✔✔-systemic errors
-random errors
Limitations on scientific models ✔✔they are usually simplified versions of the real situation
or concept
Difference between logistic and exponential growth ✔✔Exponential growth: J curve.
population keeps growing
Logistic growth: S curve. population slows down when they hit K
Molarity = ✔✔mol of solute/L of solution
,How to dispose of acidic substances ✔✔add a base before disposing
Organic vs. Inorganic molecules ✔✔-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 ✔✔Carbohydrates
Lipids
Nucleic Acids
Proteins
What is a polar bond ✔✔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 ✔✔where the hydrogen atom of one H20 molecule is
slightly electropositive and the oxygen atom is slightly electronegative
What are the properties of water? ✔✔high specific heat
high heat of vaporization
universal solvent
high surface tension
cohesion and adhesion
, insulator and density
Difference between adhesion and cohesion ✔✔Cohesion: water bond to water
Adhesion: water bond to anything else
What are the 4 macromolecules ✔✔Carbohydrates
Nucleic acids
Proteins
Lipids
What are carbohydrates ✔✔- biological molecules make of carbon, hydrogen and oxygen.
Types of carbohydrates ✔✔Monosacchrides (simple sugars like glucose)
Disaccharides (lactose)
Polysaccharides (start, glycogen)
What are nucleic acids ✔✔-made out of units called
nucleotides -two naturally occurring varieties (DNA and RNA)
What are proteins ✔✔Made of chains of amino acids
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