Question 1

Which of the following correctly ranks the types of bonds from strongest to weakest electrostatic interaction?

Accepted Answer

Ionic bonds, Hydrogen bonds, van der Waals

Question 2

A beaker contains a solution with a pH of 3. Which of the following statements is TRUE about this solution?

Accepted Answer

It has a higher concentration of H$$^+$$ ions than OH$$^-$$ ions.

Question 3

Which of the following is NOT a building block of proteins?

Accepted Answer

Monosaccharides

Question 4

What type of chemical reaction forms a peptide bond between two amino acids?

Accepted Answer

Dehydration synthesis (condensation) reaction

Question 5

Which level of protein structure is primarily determined by the sequence of amino acids?

Accepted Answer

Primary structure

Question 6

Which of the following interactions is responsible for stabilizing the secondary structure of proteins?

Accepted Answer

Hydrogen bonds between backbone atoms

Question 7

A mutation causes a single amino acid change in the primary structure of a protein. Which of the following is a possible consequence?

Accepted Answer

Altered tertiary structure and possible loss of function

Question 8

Which of the following best describes the difference between a nucleotide and a nucleoside?

Accepted Answer

A nucleoside contains a sugar and a base only, while a nucleotide contains a sugar, base, and at least one phosphate group.

Question 9

Which of the following bases is found only in RNA and not in DNA?

Accepted Answer

Uracil

Question 10

Given the DNA sequence 5'-GATTCGA-3', what is the complementary sequence?

Accepted Answer

3'-CTAAGCT-5'

Question 11

Which of the following statements about the DNA double helix is TRUE?

Accepted Answer

The bases are on the inside and the sugar-phosphate backbone is on the outside.

Question 12

Which of the following correctly describes the hydrogen bonding between DNA bases?

Accepted Answer

Adenine pairs with thymine using 2 hydrogen bonds; cytosine pairs with guanine using 3 hydrogen bonds.

Question 13

Which of the following is a purine base found in nucleic acids?

Accepted Answer

Adenine

Question 14

Which of the following is TRUE about the central dogma of molecular biology?

Accepted Answer

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

Question 15

Which of the following is a feature of the tertiary structure of proteins?

Accepted Answer

Disulfide bonds between cysteine side chains

Question 16

Which of the following statements about quaternary protein structure is CORRECT?

Accepted Answer

It involves the interaction of multiple polypeptide subunits.

Question 17

Which of the following is a consequence of prion protein misfolding?

Accepted Answer

Formation of abnormal beta-sheet structures

Question 18

Which of the following correctly describes the backbone of a polynucleotide chain?

Accepted Answer

Alternating sugar and phosphate groups

Question 19

Which of the following is TRUE regarding the directionality of a DNA strand?

Accepted Answer

The 5' end has a free phosphate group and the 3' end has a free OH group.

Proteins and Nucleic Acids: Structure, Function, and Biological Importance

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