Q: Which of the following best explains how genetic information flows in eukaryotic cells, according to the central dogma of biology?

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

Question 1

Which of the following best describes the structure of DNA?

Accepted Answer

A double helix composed of two antiparallel strands held together by hydrogen bonds between complementary bases.

Question 2

Which enzyme is responsible for adding new nucleotides during DNA replication?

Accepted Answer

DNA polymerase

Question 3

During transcription, what is the role of the promoter region in a gene?

Accepted Answer

It is the DNA sequence where RNA polymerase binds to initiate transcription.

Question 4

Which of the following best explains how genetic information flows in eukaryotic cells, according to the central dogma of biology?

Accepted Answer

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

Question 5

A mutation occurs in the gene encoding DNA polymerase. Which process would be most directly affected?

Accepted Answer

DNA replication

Question 6

Which of the following is a function of tRNA during translation?

Accepted Answer

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

Question 7

Which process is used to amplify a specific segment of DNA in the laboratory?

Accepted Answer

Polymerase chain reaction (PCR)

Question 8

A scientist wants to clone a gene into a plasmid. Which enzyme is necessary to join the gene and plasmid together?

Accepted Answer

Ligase

Question 9

Which of the following best describes semiconservative replication?

Accepted Answer

Each new DNA molecule consists of one old strand and one new strand.

Question 10

Which of the following is a possible consequence of a frameshift mutation in a gene?

Accepted Answer

The resulting protein may be nonfunctional due to a shift in the reading frame.

Question 11

Which of the following best explains why restriction enzymes are important in biotechnology?

Accepted Answer

They cut DNA at specific sequences, allowing scientists to manipulate genes.

Question 12

A patient is diagnosed with a genetic disorder caused by a single defective gene. Which biotechnology technique could potentially be used to treat this patient?

Accepted Answer

Gene therapy

Question 13

Which of the following is NOT a step in the process of translation?

Accepted Answer

Synthesis of mRNA from DNA

Question 14

Which of the following best describes the function of the ribosome during protein synthesis?

Accepted Answer

It catalyzes the formation of peptide bonds between amino acids.

Question 15

Which of the following statements about gene expression is correct?

Accepted Answer

Gene expression can be regulated at multiple levels, including transcription and translation.

Question 16

A scientist uses gel electrophoresis to analyze DNA samples. What property of DNA allows this technique to separate DNA fragments?

Accepted Answer

DNA fragments are separated based on their charge and size.

Question 17

Which of the following is a real-world application of DNA fingerprinting?

Accepted Answer

Identifying individuals in forensic investigations

Question 18

Which of the following best describes the role of mRNA in the cell?

Accepted Answer

It carries the genetic code from DNA to the ribosome for protein synthesis.

Question 19

Which of the following is a post-translational modification that can affect protein function?

Accepted Answer

Addition of a phosphate group (phosphorylation)

Question 20

Which of the following statements about plasmids is correct?

Accepted Answer

Plasmids are small, circular DNA molecules found in bacteria that can be used as vectors in genetic engineering.

Unit 8 Study Guide: Molecular Genetics, Gene Expression, and Biotechnology

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