Dehydration synthesis ($$\text{Monomer}_1 + \text{Monomer}_2 \rightarrow \text{Polymer} + H_2O)$$

Question 1

Which property of water allows it to moderate Earth's climate by absorbing and releasing heat with minimal temperature change?

Accepted Answer

High specific heat capacity ($$C = \frac{q}{m \Delta T})$$

Question 2

Hydrogen bonding in water is responsible for which of the following phenomena?

Accepted Answer

Water's high boiling point compared to similar-sized molecules

Question 3

Which statement best explains why ice floats on liquid water?

Accepted Answer

Hydrogen bonds in ice create a lattice that spaces molecules farther apart, decreasing density

Question 4

A buffer in a biological system helps maintain pH by:

Accepted Answer

Donating or accepting protons ($$H^+) to $$resist changes in pH

Question 5

Which functional group is found in both amino acids and proteins, and is responsible for their basic properties?

Accepted Answer

Amino group ($$-NH_2$)

Question 6

Which of the following is a correct match between a functional group and its property?

Accepted Answer

Phosphate group ($$-PO_4$^{2-}$$): contributes negative charge and energy transfer

Question 7

Which of the following best distinguishes a cis isomer from a trans isomer?

Accepted Answer

Cis isomers have functional groups on the same side of a double bond, trans isomers have them on opposite sides

Question 8

Which macromolecule is primarily responsible for storing genetic information in cells?

Accepted Answer

Nucleic acids

Question 9

Which reaction is responsible for joining monomers to form polymers, such as proteins and polysaccharides?

Accepted Answer

Dehydration synthesis ($$	ext{Monomer}_1 + 	ext{Monomer}_2 ightarrow 	ext{Polymer} + H_2O)$$

Question 10

Which of the following statements about hydrolysis is correct?

Accepted Answer

Hydrolysis reactions break polymers into monomers by adding water ($$	ext{Polymer} + H_2O ightarrow 	ext{Monomer}_1 + 	ext{Monomer}_2)$$

Question 11

Which of the following is NOT a common element found in all macromolecules?

Accepted Answer

Calcium ($$Ca)$$

Question 12

A mutation in the DNA sequence can affect protein structure by:

Accepted Answer

Changing the order of amino acids, which can alter the protein's folding and function

Question 13

Which macromolecule is most directly involved in catalyzing chemical reactions in cells?

Accepted Answer

Proteins (as enzymes)

Question 14

Which of the following best describes the relationship between monomers and polymers?

Accepted Answer

Polymers are large molecules made by joining monomers through covalent bonds

Question 15

Which functional group is most likely to be found in ATP and is essential for energy transfer in cells?

Accepted Answer

Phosphate group ($$-PO_4$^{2-})$$

Question 16

Which of the following is a correct statement about enantiomers?

Accepted Answer

Enantiomers are mirror images of each other and can have different biological activity

Question 17

Which macromolecule contains the most energy per gram and is used for long-term energy storage in animals?

Accepted Answer

Lipids

Question 18

Which of the following is a real-world example of the importance of buffers in biological systems?

Accepted Answer

Buffers in blood maintain pH around 7.4, preventing harmful changes during exercise

Question 19

Which of the following best explains why water is an excellent solvent for ionic compounds?

Accepted Answer

Water's polarity allows it to surround and separate ions ($$Na^+$$ and $$Cl^-) in $$solution

Question 20

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

Accepted Answer

DNA is composed of nucleotides, while proteins are composed of amino acids

Study Guide: Chemistry of Life (Chapters 3, 4, 5)

Study Guide - Practice Questions