$$\text{Atomic mass} = 6 + 6 = 12$$

$$\text{Monomer} + \text{Monomer} \rightarrow \text{Polymer} + \text{H}_2\text{O}$$

Carboxyl group ($$-\text{COOH})$$

Release $$\text{H}^+$$ ions in solution

Question 1

Which of the following best describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons

Question 2

Which equation correctly represents the calculation of atomic mass for an atom with 6 protons, 6 neutrons, and 6 electrons?

Accepted Answer

$$	ext{Atomic mass} = 6 + 6 = 12$$

Question 3

Which of the following statements about covalent bonds is correct?

Accepted Answer

Covalent bonds involve the sharing of electrons between atoms

Question 4

A solution has a hydrogen ion concentration of $$1 	imes 10$$^{-4}$$ M. What is its pH?

Accepted Answer

$$4$$

Question 5

Which of the following best explains why water has a high boiling point compared to other compounds its size?

Accepted Answer

Water molecules are held together by hydrogen bonds

Question 6

Which of the following is a correct representation of a dehydration synthesis reaction?

Accepted Answer

$$	ext{Monomer} + 	ext{Monomer} ightarrow 	ext{Polymer} + 	ext{H}_2	ext{O}$$

Question 7

Which of the following functional groups is found in all amino acids?

Accepted Answer

Carboxyl group ($$-	ext{COOH})$$

Question 8

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A compound is composed of elements chemically combined in fixed proportions

Question 9

Which of the following is a property of acids?

Accepted Answer

Release $$	ext{H}^+$$ ions in solution

Question 10

Which of the following best describes the role of buffers in biological systems?

Accepted Answer

Buffers prevent drastic changes in pH

Question 11

Which of the following is true about the atomic number of an element?

Accepted Answer

It is equal to the number of protons in the nucleus

Question 12

Which of the following best explains why carbon is able to form large and complex molecules?

Accepted Answer

Carbon can form up to four covalent bonds with other atoms

Question 13

Which of the following is a correct example of an ionic compound?

Accepted Answer

$$	ext{NaCl}$$

Question 14

Which of the following best describes the difference between a saturated and an unsaturated fatty acid?

Accepted Answer

Saturated fatty acids have only single bonds between carbon atoms

Question 15

Which of the following is a correct statement about hydrogen bonds?

Accepted Answer

Hydrogen bonds form between a hydrogen atom and an electronegative atom like oxygen or nitrogen

Question 16

Which of the following best describes the process of hydrolysis?

Accepted Answer

Breaking down polymers by adding water

Question 17

Which of the following is a function of sterols in biological membranes?

Accepted Answer

Maintaining membrane fluidity

Question 18

Which of the following is the correct formula for calculating the concentration of a solution in molarity ($$M$$)?

Accepted Answer

$$M = \frac{	ext{moles of solute}}{	ext{liters of solution}}$$

Question 19

Which of the following best describes the role of nucleic acids in cells?

Accepted Answer

They store and transmit genetic information

Chemical Principles and Biological Macromolecules: Foundations for Microbiology

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