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Exam 2: Chemical Basis of Life

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Question 31

True/False

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A pH value indicatesthe hydrogen ion concentration in solutions such as body fluids.

A) True
B) False

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Question 32

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The building blocks of __________ molecules are fatty acids and glycerol.

A) triglyceride
B) steroid
C) polysaccharide
D) protein

E) B) and D)
F) None of the above

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Question 33

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The branch of science called __________ deals with the composition of matter.

What type of fatty acid will have double bonds between carbon atoms within its carbon chain?

Three atoms have the following subatomic particles:Atom 1: 3 protons, 2 neutrons, 3 electronsAtom 2: 3 protons, 3 neutrons, 2 electronsAtom 3: 3 protons, 1 neutron, 3 electronsWhich statement best describes these three atoms?

In an atom, the first (innermost) shell contains a maximum of __________ electrons.

What type of chemical bond is formed by the attraction of the positive hydrogen end of one polar molecule to the negative nitrogen or oxygen end of another polar molecule?

A solution with a pH of 6 has ten times the hydrogen ion concentration of a solution of what pH?

Stearic acid and linolenic acid are both fatty acids built on chains of 18 carbon atoms. Based on their chemical composition, which of these is the saturated fatty acid?Stearic acid: 18 carbon atoms, 36 hydrogen atoms, 2 oxygen atomsLinolenic acid: 18 carbon atoms, 30 hydrogen atoms, 2 oxygen atoms

Indicate the non-carbohydrate molecule.

The building blocks of triglyceride molecules are amino acids.

All isotopes of an element have the same number of electrons.

Name the type of chemical bonding that occurs between the two nucleotide chains of a DNA molecule.

Based on their subatomic makeup, which atom is actually an ion?Atom 1: 3 protons, 2 neutrons, 3 electronsAtom 2: 3 protons, 3 neutrons, 2 electronsAtom 3: 3 protons, 1 neutron, 3 electrons

Within a phospholipid molecule, the phosphate "head" is __________ and the fatty acid "tails" are __________.

By what mechanism does a chemical bond form between an ion of potassium (K+) and chloride (Cl-) ?

A(n) __________ solution contains more hydroxide ions than hydrogen ions.

Water is an example of a compound.

What type of lipid is used in the production of hormones such as estrogen and testosterone?

The atomic __________ for an element is equal to the number of protons in the nucleus of one atom of that particular element.