Exam (elaborations)
UCI BIO 93 – MIDTERM 1 EXAM QUESTIONS AND VERIFIED ANSWERS
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UCI BIO 93 – MIDTERM 1 EXAM QUESTIONS AND VERIFIED ANSWERS...
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The smallest unit of a chemical element is an atom.molecules—ANSWER: a combination of two or more atoms
compound: ANSWER: a combination of two or more components in a
predetermined ratio
N, C, O, H, ANSWER... are the four components that comprise 96% of all
biological things.
What is the strongest link, according to covalent bonding?
Covalent: ANSWER: When two atoms share electrons
Ionic: ANSWER electron transfer between two atoms
Answer: What is a weak bond in a hydrogen bond?
The H atom creates a covalent link and a weaker bond with another atom in a
different molecule.
nonpolar—ANSWER: equal electron distribution
(Two identical elements)
Polar: ANSWER: uneven electron distribution
has a fee.
(water)
negative: In water, what is the charge of O?
answers in the affirmative. What is the charge of H in water?
cohesion—ANSWER connections between molecules of water
, (H2O plus H2O)
solvent-ANSWER interactions between other compounds and water
Four bonds: ANSWER: How many bonds can hydrogen form on average?
15% - ANSWER What percentage of bonds will be formed at room temperature
in water?
ANSWER: more acidic as the H+ concentration rises.
more fundamental: ANSWER what causes the H-concentration to drop...
Hydrophilic means that it has a strong attraction to water.
Ionic and polar bonding
Water is repulsed by hydrophobic materials.
(covalent bonds that are nonpolar)
Buffers: Chemical reactions that are sensitive to pH variations and resistant to
pH solution changes
7.4 ANSWER Human blood has a pH of...
Which are the primary buffers in blood, bicarbonate and carbonic acid?
right: ANSWER reaction to blood pH increase (becomes more basic)
left: ANSWER reaction when blood pH drops (becomes more acidic)
The building blocks of biological molecules are carbon atoms.
4 VE-ANSWER: What is the number of VE that carbon has?
How can functional groups attach to the carbon skeleton through covalent
bonds?
hydroxyl-alcohols-ANSWER
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