Question 1

Which of the following best describes the process of transcription in protein synthesis?

Accepted Answer

It is the process where a segment of DNA is used as a template to synthesize mRNA.

Question 2

During translation, which molecule carries the genetic code from the nucleus to the ribosome?

Accepted Answer

mRNA

Question 3

A mutation in the DNA sequence of a gene most likely affects protein synthesis by:

Accepted Answer

Causing the transcription process to produce an incorrect mRNA sequence, potentially leading to a malfunctioning protein.

Question 4

Which of the following is a direct example of nutrigenomics?

Accepted Answer

A study finds that eating broccoli may increase the expression of genes linked with inflammation.

Question 5

Which statement best explains the role of ribosomes during protein synthesis?

Accepted Answer

Ribosomes are the main site for translation, facilitating the formation of peptide bonds between amino acids.

Question 6

Epigenetics refers to:

Accepted Answer

Heritable changes in gene expression that do not involve changes to the DNA sequence.

Question 7

Which of the following best illustrates the concept of gene expression?

Accepted Answer

A gene is transcribed and translated to produce a specific protein.

Question 8

If a cell's DNA contains a mutation that changes a codon from UAU (tyrosine) to UAA (stop codon), what is the most likely outcome during translation?

Accepted Answer

Translation will stop prematurely, resulting in a truncated protein.

Question 9

Which of the following equations best represents the central dogma of molecular biology?

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Protein$$

Question 10

A researcher finds that a nutrient increases the methylation of a gene's promoter region. What is the most likely effect on gene expression?

Accepted Answer

Gene expression will decrease.

Question 11

Which of the following best describes the relationship between epigenetics and nutrition?

Accepted Answer

Nutritional factors can alter gene expression without changing the DNA sequence.

Question 12

Which of the following is NOT a step in gene expression leading to protein synthesis?

Accepted Answer

Replication

Question 13

A scientist is studying a gene that is expressed in liver cells but not in muscle cells. This is most likely due to:

Accepted Answer

Epigenetic modifications that regulate gene expression in different cell types.

Question 14

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

Accepted Answer

tRNA carries amino acids to the ribosome and matches them to the coded mRNA message.

Question 15

Which of the following scenarios best demonstrates the application of nutrigenomics?

Accepted Answer

A person with a genetic variant in a folate metabolism gene modifies their diet to include more leafy greens, resulting in improved health outcomes.

Protein Synthesis, Epigenetics, and Nutrigenomics: Study Notes for Nutrition Students

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