Q: A bacterial cell is placed in a solution with a pH of 3. What is the concentration of hydrogen ions $$[H^+] in $$this solution?

$$[H^+] = 1 \times 10$$^{-3}$$\ \mathrm{M}$$

Q: Which process is responsible for breaking down glycogen into glucose monomers, and what is the general equation for this reaction?

Hydrolysis; $$\text{Glycogen} + n\ \text{H}_2\text{O} \rightarrow n\ \text{Glucose}$$

Question 1

Which property of water is most critical for its role as the universal solvent in living cells?

Accepted Answer

Its ability to form hydrogen bonds due to polarity

Question 2

A scientist is studying a molecule that is insoluble in water, forms the main component of cell membranes, and stores energy. Which class of biomolecule is this?

Accepted Answer

Lipids

Question 3

Which of the following best describes the process of dehydration synthesis?

Accepted Answer

Water is removed to join monomers into polymers

Question 4

A bacterial cell is placed in a solution with a pH of 3. What is the concentration of hydrogen ions $$[H^+] in $$this solution?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-3}$$\ \mathrm{M}$$

Question 5

Which of the following molecules is most likely to be hydrophobic and why?

Accepted Answer

Triglyceride, because it is nonpolar

Question 6

Which functional groups are present in every amino acid?

Accepted Answer

Amino group and carboxyl group

Question 7

A mutation prevents a bacterium from synthesizing phospholipids. Which of the following is NOT a likely consequence?

Accepted Answer

The cell cannot store genetic information

Question 8

Which process is responsible for breaking down glycogen into glucose monomers, and what is the general equation for this reaction?

Accepted Answer

Hydrolysis; $$	ext{Glycogen} + n\ 	ext{H}_2	ext{O} ightarrow n\ 	ext{Glucose}$$

Question 9

Which of the following statements about ATP is correct?

Accepted Answer

ATP is a nucleotide composed of adenine, ribose, and three phosphates

Question 10

During protein synthesis, which type of bond is formed between amino acids, and what is the chemical reaction involved?

Accepted Answer

Peptide bond; dehydration synthesis

Question 11

Which of the following best explains why phospholipids form bilayers in water?

Accepted Answer

Their hydrophobic tails avoid water while hydrophilic heads interact with water

Question 12

A solution has a pH of 8. Compared to pure water, this solution has:

Accepted Answer

A lower concentration of $$\mathrm{H}^+$$ ions

Question 13

Which of the following is a correct comparison between DNA and RNA?

Accepted Answer

DNA is usually double stranded; RNA is usually single stranded

Question 14

Which of the following is a polysaccharide and serves as an energy storage molecule in animals?

Accepted Answer

Glycogen

Question 15

A bacterial cell is actively synthesizing DNA, building proteins, producing ATP, and forming its plasma membrane. Which biomolecule is directly involved in each process, respectively?

Accepted Answer

Nucleic acids, proteins, ATP, phospholipids

Question 16

Which level of protein structure is characterized by the assembly of multiple polypeptide chains?

Accepted Answer

Quaternary

Question 17

Which nitrogenous base is found only in RNA and not in DNA?

Accepted Answer

Uracil

Question 18

Which of the following statements about lipids is FALSE?

Accepted Answer

Lipids are built from amino acids

Question 19

Which process releases usable cellular energy from ATP, and what is the general equation for this reaction?

Accepted Answer

Hydrolysis; $$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P_i} + 	ext{energy}$$

Question 20

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

Accepted Answer

Storing hereditary information

Microbiology Chapter 2 Study Guidance: Water, Biomolecules, and Cellular Processes

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