Q: Which equation correctly represents the molarity ($$M) of a $$solution?

$$M = \dfrac{\text{moles of solute}}{\text{volume of solution (L)}}$$

Question 1

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

Accepted Answer

Surface tension due to hydrogen bonding

Question 2

A sodium atom ($$\mathrm{Na}) $$reacts with a chlorine atom ($$\mathrm{Cl}) to $$form sodium chloride ($$\mathrm{NaCl}). $$What type of bond is formed between these atoms?

Accepted Answer

Ionic bond

Question 3

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

Accepted Answer

Water is polar and can stabilize charged particles through electrostatic interactions

Question 4

Which of the following statements about carbon is TRUE and explains its central role in biological macromolecules?

Accepted Answer

Carbon atoms can form up to four covalent bonds, allowing for complex molecular structures

Question 5

A protein loses its function after exposure to high temperature. Which concept best explains this phenomenon?

Accepted Answer

Denaturation due to disruption of tertiary and secondary structure

Question 6

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

Accepted Answer

Joining two monomers by removing a water molecule

Question 7

A molecule of glucose ($$\mathrm{C_6H_{12}O_6$}) is $$classified as which type of macromolecule?

Accepted Answer

Carbohydrate

Question 8

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Unsaturated fatty acids have one or more double bonds, causing kinks in the chain

Question 9

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

Accepted Answer

Catalyzing biochemical reactions as enzymes

Question 10

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

Accepted Answer

Hydrogen bonds in ice create a lattice structure that is less dense than liquid water

Question 11

Which equation correctly represents the molarity ($$M) of a $$solution?

Accepted Answer

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

Question 12

Which of the following is a direct consequence of water’s polarity?

Accepted Answer

Water can form hydrogen bonds with other polar molecules

Question 13

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

Accepted Answer

Catalyzing chemical reactions

Question 14

Which of the following best describes the primary structure of a protein?

Accepted Answer

The sequence of amino acids in a polypeptide chain

Question 15

Which type of chemical bond is responsible for the secondary structure of proteins?

Accepted Answer

Hydrogen bonds between backbone atoms

Question 16

Which of the following is a correct example of a monomer-polymer relationship?

Accepted Answer

Nucleotide - RNA

Question 17

Which property of water allows trees to transport water from roots to leaves against gravity?

Accepted Answer

Adhesion and cohesion due to hydrogen bonding

Question 18

Which of the following best describes the central dogma of molecular biology?

Accepted Answer

DNA is transcribed into RNA, which is then translated into protein

Question 19

Which of the following is TRUE about enzymes?

Accepted Answer

Enzymes are specific to their substrates and lower the activation energy

Question 20

Which of the following is a real-world example of van der Waals interactions?

Accepted Answer

Geckos climbing walls due to weak attractions between molecules

Unit 1: Chemistry of Life – Structure of Water, Hydrogen Bonding, and Biological Macromolecules

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