Question 1

Which property of water allows it to moderate Earth's climate by absorbing and releasing large amounts of heat with only slight changes in its own temperature?

Accepted Answer

High specific heat

Question 2

A scientist is studying a protein that loses its function when exposed to high temperatures. Which level of protein structure is most directly affected by this change?

Accepted Answer

Tertiary structure

Question 3

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

Accepted Answer

Hydrogen bonds in ice create a lattice that spaces water molecules farther apart.

Question 4

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

Accepted Answer

Monomers are joined to form polymers by removing a water molecule.

Question 5

A carbohydrate with the formula $$C_{6}H$$_{12}$$O_{6}$ is classified as which of the following?

Accepted Answer

Monosaccharide

Question 6

Which of the following best describes the role of chaperonins in protein folding?

Accepted Answer

They provide an isolated environment for proper folding of polypeptides.

Question 7

Which of the following functional groups is found in all amino acids?

Accepted Answer

Amino group $$(-NH_2$)$$

Question 8

A triglyceride is formed by joining three fatty acids to a glycerol molecule. What type of reaction is responsible for this process?

Accepted Answer

Dehydration synthesis

Question 9

Which property of water is most important for the movement of water from the roots to the leaves in plants?

Accepted Answer

Cohesion and adhesion

Question 10

Which of the following statements about phospholipids is correct?

Accepted Answer

They have hydrophilic heads and hydrophobic tails.

Question 11

A mutation changes a single amino acid in the active site of an enzyme. Which level of protein structure is directly altered by this mutation?

Accepted Answer

Primary structure

Question 12

Which of the following best explains why water is an excellent solvent for ionic and polar substances?

Accepted Answer

Water molecules form hydrogen bonds with ions and polar molecules.

Question 13

Which of the following is a correct pairing of a macromolecule and its monomer?

Accepted Answer

Carbohydrate – monosaccharide

Question 14

A student adds a drop of oil to a beaker of water and observes that the oil does not dissolve. Which property of lipids explains this observation?

Accepted Answer

Lipids are hydrophobic due to nonpolar bonds.

Question 15

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 between carbon atoms.

Question 16

Which of the following statements about hydrolysis is correct?

Accepted Answer

Hydrolysis breaks polymers into monomers by adding water.

Question 17

A patient is unable to digest lactose, a disaccharide. Which enzyme is most likely deficient in this patient?

Accepted Answer

Lactase

Question 18

Which of the following best explains why proteins can have such diverse functions in living organisms?

Accepted Answer

Proteins have a variety of structures due to different sequences of amino acids.

Question 19

Which of the following best describes the relationship between the structure and function of biological macromolecules?

Accepted Answer

The specific structure of a macromolecule determines its function.

Question 20

A researcher is studying the effect of a mutation that replaces a hydrophobic amino acid with a hydrophilic one in the core of a protein. What is the most likely consequence of this mutation?

Accepted Answer

The protein may misfold or lose its function due to disruption of hydrophobic interactions.

Structure of Water, Hydrogen Bonding, and Biological Macromolecules

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