Q: Which of the following equations correctly represents the energy release during DNA synthesis?

$$\mathrm{dNTP} \rightarrow \mathrm{dNMP} + \mathrm{PP_i} + \text{energy}$$

Question 1

Which of the following statements best describes the difference between prokaryotic and eukaryotic chromosomes?

Accepted Answer

Prokaryotic chromosomes are usually single and circular, located in the nucleoid, while eukaryotic chromosomes are multiple, linear, and found in the nucleus.

Question 2

What is the primary function of plasmids in bacterial cells?

Accepted Answer

They carry genes that provide advantages such as antibiotic resistance, conjugation, or toxin production, but are not essential for survival.

Question 3

During DNA replication, which enzyme is responsible for synthesizing the leading strand in bacteria?

Accepted Answer

DNA polymerase III

Question 4

Why is DNA replication described as 'semiconservative'?

Accepted Answer

Each daughter DNA molecule consists of one parental strand and one newly synthesized strand.

Question 5

Which of the following best explains why DNA replication is highly accurate?

Accepted Answer

DNA polymerase III proofreads newly added nucleotides and removes mismatches using its exonuclease activity.

Question 6

Which of the following equations correctly represents the energy release during DNA synthesis?

Accepted Answer

$$\mathrm{dNTP} ightarrow \mathrm{dNMP} + \mathrm{PP_i} + 	ext{energy}$$

Question 7

Which structure in bacteria is responsible for horizontal gene transfer by conjugation?

Accepted Answer

Pilus

Question 8

In eukaryotic cells, what is the role of histone proteins?

Accepted Answer

They package DNA into nucleosomes, aiding in chromosome structure and gene regulation.

Question 9

Which of the following statements about Okazaki fragments is correct?

Accepted Answer

They are short DNA fragments synthesized discontinuously on the lagging strand.

Question 10

Which of the following best describes the difference in DNA methylation between bacteria and eukaryotes?

Accepted Answer

In bacteria, adenine is most commonly methylated, while in plants and animals, cytosine is methylated.

Question 11

A mutation disables the gene for DNA ligase in a bacterial cell. Which process would be most directly affected?

Accepted Answer

Joining Okazaki fragments on the lagging strand during DNA replication.

Question 12

Which of the following is a key difference between prokaryotic and eukaryotic DNA replication?

Accepted Answer

Eukaryotic chromosomes have thousands of origins of replication, while prokaryotic chromosomes typically have one.

Question 13

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

Accepted Answer

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

Question 14

Which of the following is NOT a function of DNA methylation in bacteria?

Accepted Answer

Catalyzing peptide bond formation during translation

Question 15

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

Accepted Answer

There are 64 codons, 61 of which code for amino acids and 3 are stop codons.

Question 16

A bacterial cell is exposed to an antibiotic. Which type of plasmid would most likely help the cell survive?

Accepted Answer

Resistance (R) plasmid

Question 17

Which of the following best explains why nucleotides serve as both building blocks and energy sources during DNA synthesis?

Accepted Answer

Nucleotides contain three phosphate groups, and breaking the bonds between these groups releases energy for polymerization.

Question 18

Which of the following is a correct pairing of a DNA base with its complementary base?

Accepted Answer

Thymine pairs with adenine

Question 19

Which of the following is a unique feature of eukaryotic transcription compared to prokaryotic transcription?

Accepted Answer

It requires multiple transcription factors and produces pre-mRNA that is processed before translation.

Microbial Genetics: Structure, Function, and Replication of Genomes

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