$$[H^+] = 1 \times 10$$^{-4}$$ \ \mathrm{M}$$

Question 1

Which property of water is MOST responsible for its ability to regulate temperature in living organisms?

Accepted Answer

Its ability to form hydrogen bonds

Question 2

A solution has a pH of 4. What is the concentration of hydrogen ions $$[H^+] in $$this solution?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-4}$$ \ \mathrm{M}$$

Question 3

Which of the following best describes a dehydration synthesis reaction?

Accepted Answer

A reaction that forms polymers from monomers by removing water

Question 4

Which of the following is NOT a function of proteins in cells?

Accepted Answer

Energy storage

Question 5

Which molecule is the principal energy-carrying molecule in the cell?

Accepted Answer

Adenosine triphosphate (ATP)

Question 6

Which of the following statements about phospholipids is TRUE?

Accepted Answer

They have a polar head and nonpolar tails

Question 7

A scientist adds hydrochloric acid (HCl) to a beaker of water. What happens to the pH and why?

Accepted Answer

The pH decreases because HCl releases $$H^+$$ ions

Question 8

Which of the following is a correct pairing of a biological molecule and its building block?

Accepted Answer

Carbohydrate – Monosaccharide

Question 9

Which of the following best explains why salts dissolve in water?

Accepted Answer

Water's polarity allows it to surround and separate ions

Question 10

Which of the following is a polysaccharide used for energy storage in animals?

Accepted Answer

Glycogen

Question 11

Which of the following is a correct description of the structure of DNA?

Accepted Answer

Double-stranded with adenine pairing with thymine

Question 12

Which process is responsible for breaking down a disaccharide into two monosaccharides?

Accepted Answer

Hydrolysis

Question 13

A solution has a pH of 9. Which of the following best describes this solution?

Accepted Answer

It is basic and has more $$OH^-$$ than $$H^+$$

Question 14

Which of the following is TRUE about amino acids?

Accepted Answer

They contain both an amino group and a carboxyl group

Question 15

Which of the following best describes the role of ATP in the cell?

Accepted Answer

It is the main energy currency, releasing energy when phosphate bonds are broken

Question 16

Which of the following is a function of carbohydrates in cells?

Accepted Answer

Providing energy for cellular activities

Question 17

Which of the following statements about organic molecules is CORRECT?

Accepted Answer

They always contain carbon and hydrogen

Question 18

Which of the following is a correct description of a phospholipid bilayer?

Accepted Answer

It has hydrophilic heads facing outward and hydrophobic tails facing inward

Question 19

Which of the following is a correct statement about nucleotides?

Accepted Answer

They are composed of a base, a sugar, and a phosphate group

Question 20

A patient is given a solution with a pH of 2. Which of the following best describes this solution?

Accepted Answer

It is highly acidic and contains a high concentration of $$H^+$$ ions

Chemical Principles and Important Biological Molecules in Microbiology

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