Question 1

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

Accepted Answer

A phosphate group, a deoxyribose sugar, and one of four nitrogenous bases

Question 2

During DNA replication, which enzyme is primarily responsible for adding new nucleotides to the growing DNA strand?

Accepted Answer

DNA polymerase

Question 3

Which of the following base pairs is stabilized by three hydrogen bonds in the DNA double helix?

Accepted Answer

Guanine and Cytosine

Question 4

What is the correct sequence of events in the flow of genetic information from DNA to protein?

Accepted Answer

Transcription → Translation

Question 5

Which of the following statements about the semi-conservative model of DNA replication is correct?

Accepted Answer

Each new DNA molecule consists of one parental strand and one newly synthesized strand

Question 6

A mutation occurs during DNA replication. Which of the following best explains how this can lead to genetic variation?

Accepted Answer

Mutations can change the sequence of bases, potentially altering protein structure and function

Question 7

Which of the following is NOT a function of proteins encoded by genes?

Accepted Answer

Storing genetic information

Question 8

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar

Question 9

If a segment of DNA has the sequence 5'-ATCGGTA-3', what would be the complementary sequence on the newly synthesized strand?

Accepted Answer

3'-TAGCCAT-5'

Question 10

Which of the following best explains why DNA replication is described as 'uni-directional' at the replication fork?

Accepted Answer

One strand is synthesized continuously, while the other is synthesized in fragments

Question 11

Which enzyme is responsible for joining Okazaki fragments on the lagging strand during DNA replication?

Accepted Answer

Ligase

Question 12

A scientist is studying a cell in which DNA polymerase has lost its proofreading ability. What is the most likely consequence?

Accepted Answer

The rate of mutations in the newly synthesized DNA will increase

Question 13

Which of the following is a real-world example of a protein's function in the human body?

Accepted Answer

Keratin provides strength to hair and nails

Question 14

Which of the following best describes the role of histone proteins in eukaryotic cells?

Accepted Answer

They help package and condense DNA into chromatin

Question 15

Which of the following equations correctly represents the complementary base pairing in DNA?

Accepted Answer

$$A = T$$ and $$G = C$$

Question 16

A patient is exposed to high levels of UV radiation. Which process is most likely to be affected in their DNA?

Accepted Answer

Replication, due to increased mutation rates

Question 17

Which of the following is a key property that genetic material must possess to fulfill its role in cells?

Accepted Answer

It must be able to replicate, direct expression, and generate variation

Question 18

Which of the following best explains why RNA is generally single-stranded while DNA is double-stranded?

Accepted Answer

RNA's ribose sugar makes it less stable for double helix formation

Question 19

A geneticist is analyzing a chromosome during prophase of cell division. What structure is visible and what is its significance?

Accepted Answer

Identical sister chromatids joined by a centromere, ready for segregation

Question 20

Which of the following best describes the role of ribosomes in the flow of genetic information?

Accepted Answer

They translate mRNA into proteins

Molecular Biology of the Gene: Structure, Function, and Replication of Genetic Material

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