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Exam 3: Chemistry of Life

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Question 41

Multiple Choice

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When sodium chloride (Na⁺Cl⁻) is dissolved in water,the sodium ion is

A) attracted to the hydrogen atoms of water molecules.
B) repelled by the oxygen atoms of water molecules.
C) attracted to other sodium ions that are being dissolved.
D) attracted to the oxygen atoms of water molecules.

E) A) and C)
F) None of the above

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Question 42

Multiple Choice

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Using the answer choices below,match the characteristic with its macromolecule class. -store and transmit genetic information

A) lipids
B) carbohydrates
C) nucleic acids
D) proteins

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

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Question 43

Short Answer

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The number that represents neutrality on the pH scale is ________.

The bonds within an individual water molecule and between separate water molecules explain the special properties of water.Describe the type of bond within individual water molecules and the type of bond between separate water molecules.Then,list two unique properties of water.

Which of the following statements is true of proteins,carbohydrates,and nucleic acids?

Which of the following is correct about hydrogen bonds?

We use soap to clean ourselves better than we could with water alone.Soaps contain phospholipids that are responsible for the cleansing action.Which of the following statements is the MOST likely explanation for how soaps work?

Using the answer choices below,match the characteristic with its macromolecule class. -exhibit various levels of structure

Carbon's prominence in living systems can be explained by the fact that

The bonds connecting the atoms in the molecule below are ________ bonds

Use the molecule of ethanol shown below to match the numbers with the questions they answer.Numbers may be used more than once or not at all. -How many covalent bonds are indicated?

Indicate the basic subunits used to build each of the four major classes of macromolecules.

Using the answer choices below,match the characteristic with its macromolecule class. -speed chemical reactions

Using the answer choices below,match the characteristic with its macromolecule class. -form the major framework of biological membranes

Use the molecule of ethanol shown below to match the numbers with the questions they answer.Numbers may be used more than once or not at all. -How many valence electrons are in each hydrogen atom?

A solution with a higher free H⁺ ion concentration is more ________ than a solution with a lower free H⁺ ion concentration.

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

Individual water molecules orient toward each other because of the ________ bonds that form between them.

Stomach acid has a pH value of 1.5-2.0.Antacids have a pH value of 10.5.Antacids are a common medication used to reduce the "burning" effect of stomach acid moving back up into the esophagus (the tube that carries food to the stomach).Describe how antacids affect the concentration of free hydrogen ions to provide relief from "heartburn."

Laura's supervisor provides her with lipids,carbohydrates,proteins,and nucleic acids and asks her to determine their chemical components.Which of the following elements would she NOT expect to find in these items?