Question 1

Which of the following statements best explains how living organisms maintain order despite the second law of thermodynamics?

Accepted Answer

Living organisms create order within themselves by increasing the disorder (entropy) of their environment.

Question 2

Which molecule acts as the universal energy currency in all living cells?

Accepted Answer

ATP

Question 3

Which property of water is primarily responsible for its ability to solvate polar molecules and weaken ionic and hydrogen bonds?

Accepted Answer

Its polarity and cohesiveness

Question 4

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

Accepted Answer

Storage of genetic information

Question 5

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

Accepted Answer

The sequence of amino acids linked by peptide bonds

Question 6

Which type of noncovalent bond is primarily responsible for the stabilization of alpha helices and beta sheets in proteins?

Accepted Answer

Hydrogen bonds

Question 7

Why are only L-amino acids found in proteins?

Accepted Answer

Because the ribosome only recognizes L-amino acids during protein synthesis

Question 8

Which of the following best describes an open system in the context of living organisms?

Accepted Answer

A system in which the rate of transfer of matter and energy in equals the rate out

Question 9

Which of the following is a direct consequence of the principle of structural complementarity in enzymes?

Accepted Answer

Enzymes are highly specific for their substrates

Question 10

Which of the following amino acids contains a sulfur atom and can form disulfide bonds?

Accepted Answer

Cysteine

Question 11

A mutation causes a protein to misfold, but the cell is still able to produce a functional protein. Which cellular component most likely assisted in the correct folding of the protein?

Accepted Answer

Molecular chaperone

Question 12

Which of the following best describes the role of enzymes in cellular metabolism?

Accepted Answer

They act as catalysts to increase the rate of specific chemical reactions

Question 13

Which of the following is a property of water that is critical for the formation of biological membranes?

Accepted Answer

Hydrophobic effect, where nonpolar groups associate in water

Question 14

Which of the following statements about the flow of genetic information is correct?

Accepted Answer

It is essentially the same in all living organisms

Question 15

Which of the following is a correct statement about the second law of thermodynamics as it applies to living organisms?

Accepted Answer

Living organisms maintain order by increasing the entropy of their environment.

Question 16

Which of the following is NOT a type of noncovalent bond mediating reversible interactions of biomolecules?

Accepted Answer

Peptide bonds

Question 17

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

Accepted Answer

The assembly of multiple polypeptide chains into a functional complex

Question 18

Which of the following elements is NOT among the four most abundant in living organisms?

Accepted Answer

Sulfur

Question 19

Which of the following best describes an allosteric protein?

Accepted Answer

A protein whose functional characteristics are regulated by specific molecules in its environment

Question 20

Which of the following is a direct result of the law of bioregulation in cells?

Accepted Answer

The rate of a specific reaction can be modulated by reactions elsewhere in the network

Introduction to Biochemistry: Molecular Logic, Water, and Amino Acids

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