$$2 \text{H}_2 + \text{O}_2 \rightarrow 2 \text{H}_2\text{O}$$

$$2 \text{H}_2\text{O} \rightarrow 2 \text{H}_2 + \text{O}_2$$

Question 1

Which of the following best describes an isotope?

Accepted Answer

An atom with a different number of neutrons than usual

Question 2

Which of the following molecules is an example of a compound?

Accepted Answer

H$$_2O$$

Question 3

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

Accepted Answer

$$4$$

Question 4

Which of the following best describes a buffer in biological systems?

Accepted Answer

A substance that releases or absorbs H$$^+$$ ions to stabilize pH

Question 5

Which of the following is a synthesis reaction?

Accepted Answer

$$2 	ext{H}_2 + 	ext{O}_2 ightarrow 2 	ext{H}_2	ext{O}$$

Question 6

Which of the following best explains why water is a polar molecule?

Accepted Answer

Oxygen is more electronegative than hydrogen, creating partial charges

Question 7

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

Accepted Answer

The bond between sodium and chlorine in NaCl

Question 8

Which of the following best describes a hydrophobic molecule?

Accepted Answer

A molecule that minimizes contact with water

Question 9

Which of the following is a polymer made of glucose monomers and is used for energy storage in animals?

Accepted Answer

Glycogen

Question 10

Which of the following best describes the role of enzymes in chemical reactions?

Accepted Answer

They act as catalysts to increase the rate of reactions

Question 11

Which of the following is an example of a decomposition reaction?

Accepted Answer

$$2 	ext{H}_2	ext{O} ightarrow 2 	ext{H}_2 + 	ext{O}_2$$

Question 12

Which of the following best describes a nonpolar covalent bond?

Accepted Answer

Atoms share valence electrons equally and have the same electronegativity

Question 13

Which of the following is a real-life example of a buffer system in the human body?

Accepted Answer

The bicarbonate system maintaining blood pH

Question 14

Which of the following best describes the difference between organic and inorganic molecules?

Accepted Answer

Organic molecules contain both carbon and hydrogen

Question 15

Which of the following is an isomer of glucose?

Accepted Answer

Fructose

Question 16

Which of the following best describes an exergonic reaction?

Accepted Answer

A reaction that creates products with lower final energy than reactants

Question 17

Which of the following ions is a cation?

Accepted Answer

Na$$^+$$

Question 18

Which of the following best describes the function of chitin?

Accepted Answer

Strengthens exoskeletons of insects and fungi

Question 19

Which of the following best explains why sodium chloride (NaCl) dissolves in water?

Accepted Answer

Water molecules surround and stabilize Na$$^+$$ and Cl$$^-$$ ions

Question 20

Which of the following is a correct example of an exchange reaction?

Accepted Answer

$$	ext{NaCl} + 	ext{AgNO}_3 ightarrow 	ext{NaNO}_3 + 	ext{AgCl}$$

Biochemistry Basics for Microbiology Students

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