Question 1

The weak electrical attractions that form between two water molecules are called ________ bonds.

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Question 2

During a study session,a Biology classmate holds up a bottle of water and mentions that there are both hydrogen bonds and covalent bonds found within the liquid.Explain your classmate's statement by describing the types of bonds that are found within your bottle of water.

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Question 3

The element ________ makes up the chemical backbone of most molecules on planet Earth.

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Question 4

Nonpolar molecules that are repelled by water are known as ________ molecules.

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Question 5

Nitrogen has an atomic number of 7 and an atomic mass number of 14.Using the image provided below,diagram the location and number of protons,neutrons,and electrons in nitrogen.

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Question 6

Molecules with an uneven distribution of charge are described as ________.

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Question 7

The biomolecules that are copied and transmitted from parents to offspring are ________.

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Question 8

The pH value of pure water is 7.0.When Ralph measures the pH of rainwater in his neighborhood,he finds the pH value is 6.0.Which of these solutions has a higher concentration of hydrogen ions? What is the difference in the hydrogen ion concentration?

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Question 9

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

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Question 10

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.

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Question 11

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

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Question 12

After giving a baby a bath,a parent applies baby oil to their child's skin.How does the baby oil help the baby's skin to retain moisture throughout the day? Explain the chemical basis of water retention in this example.

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Question 13

An atom that becomes charged due to the gain or loss of an electron is called a(n)________.

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Question 14

Antibodies are an important class of human proteins that function in immune defense.If scientists fragmented antibodies under laboratory conditions,what chemical building blocks would they recover?

Accepted Answer

Antibodies are proteins, and proteins are made up of amino acids. Thus, if antibodies were fragmented, the chemical building blocks that would be recovered would be amino acids.

Question 15

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.

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Question 16

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.

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Question 17

The positively charged subatomic particle is located in the ________.

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Question 18

A solution with a pH of 9 is more ________ than a solution with a pH of 7.

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Question 19

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

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Question 20

How many different amino acids are used to build proteins?

Accepted Answer

Only 20 different amino acids are used to build proteins. Each amino acid has a unique side chain (R-group) that varies in size, shape, charge, and other properties. The sequence and arrangement of amino acids determine the three-dimensional structure and function of the protein.

Quiz 3: Chemistry of Life