Question 1

Which of the following best describes the location of DNA in prokaryotic and eukaryotic cells?

Accepted Answer

In prokaryotes, DNA is found in the nucleoid region; in eukaryotes, DNA is found in the nucleus and organelles such as mitochondria and chloroplasts.

Question 2

Which of the following statements about the structure of DNA is correct?

Accepted Answer

DNA is composed of nucleotides, each containing a phosphate group, a deoxyribose sugar, and a nitrogenous base.

Question 3

During DNA replication, which enzyme is responsible for unwinding the double helix?

Accepted Answer

Helicase

Question 4

Which of the following best explains the difference between the leading and lagging strands during DNA replication?

Accepted Answer

The leading strand is synthesized continuously in the 5' to 3' direction, while the lagging strand is synthesized discontinuously as Okazaki fragments.

Question 5

Which of the following base pairs is correct for DNA and RNA, respectively?

Accepted Answer

DNA: $$A-T$$, $$G-C$$; RNA: $$A-U$$, $$G-C$$

Question 6

A gene is best defined as:

Accepted Answer

A segment of DNA that codes for a functional product, usually a protein.

Question 7

Which of the following statements about the central dogma of molecular biology is correct?

Accepted Answer

It states that genetic information flows from DNA to RNA to protein.

Question 8

Which enzyme is responsible for synthesizing the RNA primer during DNA replication?

Accepted Answer

Primase

Question 9

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

Accepted Answer

tRNA carries specific amino acids to the ribosome and matches its anticodon to the codon on mRNA.

Question 10

In prokaryotes, where does transcription occur?

Accepted Answer

In the cytoplasm

Question 11

Which of the following statements about plasmids is correct?

Accepted Answer

Plasmids are small, circular DNA molecules that can carry genes for antibiotic resistance.

Question 12

Which of the following is an example of a repressible gene?

Accepted Answer

A gene that is normally on but can be turned off when a specific product is present, such as the trp operon in E. coli.

Question 13

Which process involves the uptake of naked DNA from the environment by a bacterial cell?

Accepted Answer

Transformation

Question 14

A scientist is studying a bacterial strain that can transfer antibiotic resistance genes to another strain via a pilus. Which genetic exchange mechanism is being observed?

Accepted Answer

Conjugation

Question 15

Which of the following best describes the function of small nuclear ribonucleoproteins (snRNPs) in eukaryotic cells?

Accepted Answer

They are involved in the removal of introns from pre-mRNA during RNA splicing.

Question 16

Which of the following is true regarding the triplet code (codon) in translation?

Accepted Answer

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

Question 17

Which of the following statements about binary fission in bacteria is correct?

Accepted Answer

Binary fission results in two genetically identical daughter cells.

Question 18

A researcher observes a 'Christmas tree' structure under an electron microscope in a prokaryotic cell. What process is being visualized?

Accepted Answer

Multiple RNA polymerases transcribing a single gene simultaneously.

Question 19

Which of the following best describes the difference between constitutive, inducible, and repressible genes?

Accepted Answer

Constitutive genes are always expressed, inducible genes are turned on by specific substrates, and repressible genes are turned off by specific products.

Question 20

Which of the following is a key difference between DNA and RNA?

Accepted Answer

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

Bacterial Genetics: Structure, Function, and Genetic Exchange

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