Question 1

Which of the following best describes the process of serial dilution in microbiology?

Accepted Answer

A technique to sequentially dilute a bacterial culture to obtain countable colonies.

Question 2

If you add 1 mL of a bacterial culture to 99 mL of broth, what is the dilution factor and its scientific notation?

Accepted Answer

$$1:100$$, $$10^{-2}$$

Question 3

Why is the viable plate count method considered the 'gold standard' for quantifying bacteria?

Accepted Answer

It counts only living cells capable of forming colonies.

Question 4

Which of the following statements about plasmids is TRUE?

Accepted Answer

Plasmids are small, circular DNA molecules that replicate independently of the chromosome.

Question 5

A bacterial cell contains a plasmid with a gene for antibiotic resistance. What is the most likely consequence if this plasmid is lost?

Accepted Answer

The bacterium will lose its ability to survive in the presence of the antibiotic.

Question 6

Which of the following best describes the relationship between genotype and phenotype?

Accepted Answer

Genotype is the DNA sequence, and phenotype is the observable physical characteristic.

Question 7

Which of the following is NOT a component of a nucleotide in DNA?

Accepted Answer

Amino acid

Question 8

How many hydrogen bonds form between guanine and cytosine in DNA?

Accepted Answer

$$3$$

Question 9

Which of the following statements about DNA replication is correct?

Accepted Answer

DNA replication is semiconservative, producing two molecules each with one old and one new strand.

Question 10

During DNA replication, which enzyme is responsible for replacing RNA primers with DNA?

Accepted Answer

DNA polymerase I

Question 11

Which of the following best explains why the lagging strand is synthesized discontinuously?

Accepted Answer

DNA polymerase can only synthesize DNA in the 5' to 3' direction, but the lagging strand template runs 5' to 3'.

Question 12

Which of the following is a function of the F-plasmid in bacteria?

Accepted Answer

Enables conjugation by containing tra-genes

Question 13

Which of the following is TRUE about the genetic code?

Accepted Answer

It is the set of rules by which nucleotide triplets in DNA are translated into proteins.

Question 14

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

Accepted Answer

DNA → RNA → Protein

Question 15

In eukaryotic cells, where does transcription primarily occur?

Accepted Answer

Nucleus

Question 16

Which of the following is a key difference between prokaryotic and eukaryotic gene organization?

Accepted Answer

Prokaryotic genes are organized into operons, while eukaryotic genes are usually transcribed individually.

Question 17

Which of the following statements about genome size is correct?

Accepted Answer

Some plants have larger genomes than humans.

Question 18

Which enzyme is responsible for unzipping the DNA double helix during replication?

Accepted Answer

Helicase

Question 19

What is the role of a spliceosome in eukaryotic cells?

Accepted Answer

It removes introns and joins exons in pre-mRNA.

Question 20

A scientist wants to genetically engineer bacteria to produce human insulin. Which genetic element would be most useful for introducing the insulin gene into the bacteria?

Accepted Answer

Plasmid

Microbial Genetics and DNA Replication: Core Concepts and Mechanisms

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