Question 1

Which of the following best describes a synthesis reaction in biological systems?

Accepted Answer

A reaction where two or more atoms, ions, or molecules combine to form a larger molecule.

Question 2

What type of chemical bond is formed when electrons are transferred from one atom to another?

Accepted Answer

Ionic bond

Question 3

Which of the following is true about acids in terms of pH?

Accepted Answer

Acids have a pH lower than 7 and contain more H+ than OH-.

Question 4

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

Accepted Answer

$$ \mathrm{NaOH} + \mathrm{HCl} \rightarrow \mathrm{NaCl} + \mathrm{H}_2\mathrm{O} $$

Question 5

Which of the following statements correctly distinguishes organic from inorganic compounds?

Accepted Answer

Organic compounds always contain carbon and hydrogen and are held together by covalent bonds.

Question 6

Which of the following is a function of the glycocalyx in eukaryotic cells?

Accepted Answer

It strengthens the cell surface and helps attach cells together.

Question 7

What is the main difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose sugar and is double-stranded, while RNA contains ribose sugar and is single-stranded.

Question 8

Which of the following best describes a decomposition reaction?

Accepted Answer

A reaction where a molecule is broken down into smaller molecules, ions, or atoms.

Question 9

Which of the following is a polysaccharide found in the cell wall of plants?

Accepted Answer

Cellulose

Question 10

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

Accepted Answer

Hydrogen bonds are weak bonds formed when a hydrogen atom covalently bonded to one atom is attracted to another atom.

Question 11

Which of the following is the general formula for carbohydrates?

Accepted Answer

$$ \mathrm{CH}_2\mathrm{O} $$

Question 12

Which of the following is a function of proteins in living cells?

Accepted Answer

They act as enzymes to speed up biochemical reactions.

Question 13

Which of the following is a correct description of a peptide bond?

Accepted Answer

A bond formed between two amino acids by dehydration synthesis.

Question 14

Which of the following is true about the pH range for optimal growth of most microorganisms?

Accepted Answer

Most microorganisms grow best in environments with a pH between 6.5 and 8.5.

Question 15

Which of the following is a real-world example of a decomposition reaction in the human body?

Accepted Answer

Breaking down sucrose into glucose and fructose during digestion.

Question 16

Which of the following is a correct statement about the role of sodium bicarbonate in the digestive system?

Accepted Answer

It neutralizes chime and makes the small intestine's pH slightly basic.

Question 17

Which of the following is a correct description of the structure of an atom?

Accepted Answer

Protons and neutrons are found in the nucleus, while electrons are found in electron shells surrounding the nucleus.

Question 18

Which of the following is a correct statement about the role of B. anthracis capsule in virulence?

Accepted Answer

The capsule is made of poly-D-glutamic acid and helps the bacterium avoid digestion by host macrophages.

Question 19

Which of the following is a correct statement about the function of the large intestine?

Accepted Answer

It stores indigestible material and digestive waste until elimination through the anus.

Question 20

Which of the following is a correct statement about the role of enzymes in digestion?

Accepted Answer

Enzymes have an optimum pH at which their activity is highest.

Chapter 2: Chemical Principles in Microbiology

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