Q: The central dogma of molecular genetics states that genetic information flows from DNA to RNA to protein. Which equation best represents this process?

$$\text{DNA} \rightarrow \text{RNA} \rightarrow \text{Protein}$$

Question 1

Which level of protein structure is directly determined by the sequence of amino acids, and is responsible for the diversity of proteins found in nature?

Accepted Answer

Primary structure

Question 2

A peptide bond forms between which two groups of adjacent amino acids?

Accepted Answer

The amino group of one amino acid and the carboxyl group of another

Question 3

Which type of bond stabilizes the secondary structure of proteins, such as alpha helices and beta sheets?

Accepted Answer

Hydrogen bonds

Question 4

Which amino acid is most likely to participate in hydrogen bonding due to its side chain?

Accepted Answer

Serine

Question 5

A mutation changes a single nucleotide in the DNA sequence, resulting in a different amino acid in the protein. This is an example of which type of mutation?

Accepted Answer

Missense mutation

Question 6

In sickle cell anemia, a single amino acid substitution occurs in hemoglobin. Which structural level of the protein is directly affected first by this mutation?

Accepted Answer

Primary structure

Question 7

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

Accepted Answer

A three-dimensional shape stabilized by interactions between side chains

Question 8

Which of the following amino acids is most likely to form an ionic bond with aspartate?

Accepted Answer

Lysine

Question 9

The central dogma of molecular genetics states that genetic information flows from DNA to RNA to protein. Which equation best represents this process?

Accepted Answer

$$	ext{DNA} ightarrow 	ext{RNA} ightarrow 	ext{Protein}$$

Question 10

Which codon is the start codon for translation in most organisms?

Accepted Answer

$$	ext{AUG}$$

Question 11

What does it mean that the genetic code is 'degenerate'?

Accepted Answer

Multiple codons can specify the same amino acid

Question 12

Which of the following is a stop codon?

Accepted Answer

$$	ext{UAA}$$

Question 13

Which modification occurs to eukaryotic mRNA after transcription, but before translation?

Accepted Answer

Addition of a poly-A tail

Question 14

Which of the following best describes the function of tRNA during translation?

Accepted Answer

Brings amino acids to the ribosome and matches them to the mRNA codon

Question 15

A frameshift mutation can occur due to which of the following mechanisms?

Accepted Answer

Insertion or deletion of a base

Question 16

Which of the following is a difference between prokaryotic and eukaryotic ribosomes?

Accepted Answer

Eukaryotic ribosomes are found in the cytoplasm and on the rough ER, while prokaryotic ribosomes are only in the cytoplasm

Question 17

Which of the following best explains why antibiotics can target bacterial ribosomes without affecting human ribosomes?

Accepted Answer

Bacterial ribosomes have a different structure than human ribosomes

Question 18

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

Accepted Answer

Storing genetic information

Question 19

Which of the following amino acids is most likely to be found in the interior of a protein due to its hydrophobic side chain?

Accepted Answer

Valine

Question 20

Which of the following best describes a silent mutation?

Accepted Answer

A mutation that does not change the amino acid sequence

Study Guide: Proteins, Amino Acids, and Gene Expression

Study Guide - Practice Questions

Study Guide - Flashcards