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 mitochondria.

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

Which equation correctly represents the complementary base pairing in DNA?

Accepted Answer

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

Question 4

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

Accepted Answer

Helicase

Question 5

A scientist is studying a bacterial cell with a circular chromosome. Which of the following statements about its DNA replication is correct?

Accepted Answer

Replication begins at a single origin and proceeds bidirectionally around the chromosome.

Question 6

Which of the following best describes the central dogma of molecular biology?

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Protein$$

Question 7

Which of the following is NOT a difference between DNA and RNA?

Accepted Answer

DNA is found only in the cytoplasm, while RNA is found only in the nucleus.

Question 8

Which type of RNA carries amino acids to the ribosome during translation?

Accepted Answer

tRNA

Question 9

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

Accepted Answer

Transcription

Question 10

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

Accepted Answer

They help splice out introns from pre-mRNA.

Question 11

A gene is defined as:

Accepted Answer

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

Question 12

Which of the following best describes the triplet code (codon) in translation?

Accepted Answer

A sequence of three nucleotides in mRNA that specifies an amino acid.

Question 13

Which of the following is a feature of the lagging strand during DNA replication?

Accepted Answer

It is synthesized in short fragments called Okazaki fragments.

Question 14

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 15

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

Accepted Answer

A gene that is turned off when a specific end product is present.

Question 16

A patient is infected with a bacterial strain that has acquired a resistance gene through conjugation. Which structure is most likely involved in this process?

Accepted Answer

Pilus

Question 17

Which of the following best describes binary fission in bacteria?

Accepted Answer

A process where a single cell divides into two genetically identical daughter cells.

Question 18

Which of the following is a key difference between transformation and transduction in bacteria?

Accepted Answer

Transformation involves uptake of naked DNA from the environment, while transduction involves DNA transfer via a bacteriophage.

Question 19

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

Accepted Answer

Simultaneous transcription and translation of a gene.

Question 20

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

Accepted Answer

They catalyze the formation of peptide bonds between amino acids.

Bacterial Genetics: Structure, Function, and Mechanisms

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