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

Question 1

Which of the following best describes the structure of a nucleotide found in DNA?

Accepted Answer

A nitrogenous base, a five-carbon sugar, and a phosphate group

Question 2

What is the primary difference between DNA and RNA nucleotides?

Accepted Answer

DNA contains deoxyribose sugar and thymine, while RNA contains ribose sugar and uracil

Question 3

Which equation correctly represents the flow of genetic information in a cell?

Accepted Answer

$$DNA ightarrow RNA ightarrow 	ext{protein}$$

Question 4

During DNA replication, which enzyme is responsible for joining Okazaki fragments on the lagging strand?

Accepted Answer

DNA ligase

Question 5

A mutation that results in the insertion or deletion of a nucleotide, altering the reading frame of the genetic message, is called:

Accepted Answer

A frameshift mutation

Question 6

Which of the following statements about the genetic code is TRUE?

Accepted Answer

It is redundant, meaning more than one codon can code for the same amino acid

Question 7

What is the role of transfer RNA (tRNA) during translation?

Accepted Answer

It brings the appropriate amino acid to the ribosome by matching its anticodon to the mRNA codon

Question 8

Which of the following codons is an initiation codon for translation?

Accepted Answer

AUG

Question 9

In eukaryotic cells, what must happen to mRNA before it leaves the nucleus?

Accepted Answer

It must be processed by removing introns and adding a cap and tail

Question 10

Which of the following best explains why mutations can have significant effects on protein function?

Accepted Answer

Mutations can change the amino acid sequence, potentially altering the protein's structure and function

Question 11

Which enzyme synthesizes RNA from a DNA template during transcription?

Accepted Answer

RNA polymerase

Question 12

A base-pair substitution mutation is best described as:

Accepted Answer

The replacement of one nucleotide and its base pair by another

Question 13

Which of the following is NOT a function of ribosomes?

Accepted Answer

Synthesizing DNA from RNA templates

Question 14

During DNA replication, which direction does DNA polymerase synthesize the new strand?

Accepted Answer

$$5' \rightarrow 3'$$ direction

Question 15

Which of the following best describes a semiconservative model of DNA replication?

Accepted Answer

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

Question 16

A scientist exposes cells to ultraviolet light, which causes mutations. What type of mutation is most likely to occur?

Accepted Answer

Mutagenesis

Question 17

Which of the following statements about codons is correct?

Accepted Answer

Each codon consists of three nucleotides and codes for a specific amino acid

Question 18

Which process involves the removal of introns from pre-mRNA in eukaryotic cells?

Accepted Answer

RNA splicing

Question 19

A patient is diagnosed with sickle-cell disease, which is caused by a mutation in the hemoglobin gene. What type of mutation is responsible?

Accepted Answer

A base-pair substitution

Question 20

Which of the following best explains why antibiotics like tetracycline can target bacterial ribosomes without affecting eukaryotic ribosomes?

Accepted Answer

Bacterial ribosomes are structurally different from eukaryotic ribosomes

The Structure of the Genetic Material: DNA, RNA, and the Flow of Genetic Information

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