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

Question 1

Which property of water is primarily responsible for the ability of insects like water striders to walk on its surface?

Accepted Answer

Surface tension due to hydrogen bonding

Question 2

Which of the following best explains why water has a high heat of vaporization?

Accepted Answer

Hydrogen bonds between water molecules require significant energy to break

Question 3

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}$$ M

Question 4

Which of the following statements about carbon is TRUE and helps explain its ability to form diverse molecules?

Accepted Answer

Carbon can bond to four other atoms, allowing for complex structures

Question 5

Which functional group is found in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 6

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar

Question 7

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

Accepted Answer

A reaction that joins monomers to form polymers by removing water

Question 8

A buffer system in human blood helps maintain pH homeostasis. Which equation best represents the bicarbonate buffer system?

Accepted Answer

$$CO_2 + H_2O$$ \rightleftharpoons H_2CO_3 \rightleftharpoons $$HCO_3^- + H$$^+$$

Question 9

Which of the following macromolecules is primarily responsible for storing genetic information?

Accepted Answer

Nucleic acids

Question 10

Which of the following best explains why ice floats on water?

Accepted Answer

Ice is less dense than liquid water because hydrogen bonds hold water molecules further apart in the solid state

Question 11

Which of the following is a correct statement about the structure of phospholipids in biological membranes?

Accepted Answer

Phospholipids form bilayers with hydrophilic heads facing outward and hydrophobic tails facing inward

Question 12

Which of the following is NOT a function of proteins in living organisms?

Accepted Answer

Storing genetic information

Question 13

Which of the following best describes the difference between purines and pyrimidines in nucleic acids?

Accepted Answer

Purines have a double ring structure, while pyrimidines have a single ring structure

Question 14

Which of the following molecules is a disaccharide?

Accepted Answer

Sucrose

Question 15

A protein's tertiary structure is stabilized by which of the following interactions?

Accepted Answer

Hydrophobic interactions, ionic bonds, disulfide bridges, and hydrogen bonds

Question 16

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

Accepted Answer

ATP provides energy for cellular processes

Question 17

Which of the following statements about enzyme catalysis is correct?

Accepted Answer

Enzymes lower the activation energy, speeding up reactions

Question 18

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

Accepted Answer

$$M = \frac{	ext{moles of solute}}{	ext{volume of solution (L)}}$$

Question 19

Which of the following statements about hydrolysis reactions is correct?

Accepted Answer

Hydrolysis reactions break polymers into monomers by adding water

Question 20

Which of the following best explains why buffers are important in biological systems?

Accepted Answer

Buffers help maintain a stable pH by neutralizing excess acids or bases

Unit 2: Biochemistry – General Biology Study Notes

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