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Exam 3: Chemistry of Life

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Question 1

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There are four major classes of macromolecules that are found in living systems and each uses a carbon skeleton as its structural backbone.Why is carbon regularly assembled to make important biological molecules?

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All of the major biological molecules (m...

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Question 2

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Macromolecules are typically formed by repetitively adding small monomers together.Which macromolecule is properly matched with the appropriate monomer?

A) polypeptide-amino acid
B) nucleic acid-amino acid
C) polysaccharide-nucleotide
D) triglyceride-cholesterol

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Question 3

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Which of the following could be built solely from glucose molecules?

An acid is a polar substance that dissolves in water and

A carwash attendant offers to treat Martin's windshield with a protective agent.This substance coats the glass,causing beads of water to easily roll off during a rain shower.Which of the following must be correct about the protective agent?

A scientist observed a chemical that changes to bright red in the presence of organic compounds containing nitrogen and phosphorus.To test this chemical,a set of test tubes each containing a purified sample of one of the following organic compounds is prepared.The chemical is then added to each tube.The test tube containing ________ will always turn bright red.

Gina makes vinaigrette dressing with olive oil and vinegar and then shakes the jar vigorously.For a few minutes it appears as if the oil and vinegar have mixed.Then,she notices the two liquids separating from each other.Describe why these two liquids do not stay together even after vigorous mixing.

The subatomic particles that possess a single negative charge and surround the nucleus are the

Lithium,with an atomic number of 3,has a tendency to lose electrons when it chemically bonds to another atom.What type of chemical bonds does lithium usually form with other atoms? Explain how you determined your answer.

Based on the figure shown below,which of the following has a lower concentration of hydrogen ions?

Which of the following is the largest in size?

In making her morning tea,Dorothy drops a sugar cube into some hot water.She stirs the mixture but no longer sees the sugar cube at the bottom of her mug.Based on her observation of sugar dissolving in hot water,she can properly conclude that the sugar is

Nitrogen has seven protons,seven neutrons,and seven electrons.What is the atomic mass of nitrogen?

In living systems,a critical component of many reactions is

The most basic solution in the figure shown below is

The chemical reaction that represents photosynthesis is 6 H₂O + 6 CO₂ $\rightarrow$ C₆H₁₂O₆ + 6 O₂.What are the reactants?

Which of the following are composed of the same monomers?

Carbon atoms are bound to each other by ________ bonds.

The genetic material found in all living things is made of building blocks called

The class of macromolecules that do not form true polymers are the ________.