Bio 201 Exam 1 (Chapters 1-3) Questions and Correct Answers
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Course
BIO 201
Institution
BIO 201
What are the three domains of life? Bacteria, Archaea, Eukarya
Describe the Bacteria domain Unicellular Adaptation to all environments No membrane bound organelles
Describe the Archaea domain Unicellular Adaptations to extreme environments No membrane bound organelles
Describe the Eukarya domain...
Bio 201 Exam 1 (Chapters 1-3)
Questions and Correct Answers
What are the three domains of life? ✅Bacteria, Archaea, Eukarya
Describe the Bacteria domain ✅Unicellular
Adaptation to all environments
No membrane bound organelles
Describe the Archaea domain ✅Unicellular
Adaptations to extreme environments
No membrane bound organelles
Describe the Eukarya domain ✅Uni or multicellular
Membrane bound organelles
Nucleus
Very complex
The four most important elements of life are? ✅Carbon- ¹²₆C
Hydrogen- ¹₁H
Nitrogen- ¹⁴₇N
Oxygen- ¹⁶₈O
Based on the arrangement of electrons, how many covalent bonds can Carbon form?
✅4
Based on the arrangement of electrons, how many covalent bonds can Hydrogen form?
✅1
Based on the arrangement of electrons, how many covalent bonds can Nitrogen form?
✅3
Based on the arrangement of electrons, how many covalent bonds can Oxygen form?
✅2
Why is it so important to life that water is an excellent solvent? ✅Water is considered
the universal solvent, it can dissolve a great number of substances, more than any other
liquid. With out water, every living organism would die.
, What would happen if solid water was denser than liquid water? ✅The liquid water
would freeze turning into ice, the solid water would then sink because it would be less
dense than the liquid water, eventually killing all life forms that live in water.
Substance #1 has a pH value of 4.2 while substance #2 has a pH value of 5.2. Which
substance is more acidic and by a factor of how much? ✅Substance #1 is more acidic.
Thus substance #1 is 10 times more acidic than substance #2.
What is the purpose of buffers? ✅A buffer is a chemical or combination of chemicals
that keeps pH within normal limits.
How do buffers perform their function? ✅H+ and OH- are added to neutralize either the
acid or base
Hydroxyl compound name: ✅Alcohols (ethanol)
Hydroxyl functional properties: ✅Polar, forms hydrogen bonds
Hydroxyl are found in: ✅Present in sugars and some amino acids
Carbonyl compound name: ✅Aldehyde (formaldehyde) and Ketone(acetone)
Carbonyl functional properties ✅Polar
Carbonyl are found in: ✅Present in sugars
Carboxyl compound name: ✅Carboxylic acids
Carboxyl functional properties: ✅Polar, acidic
Carboxyl are found in: ✅Present in fatty acids and amino acids
Amino acid compound name: ✅Amines (tryptophan)
Amino acids functional properties: ✅Polar, basic.
Forms hydrogen bonds
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