MCQ Bank

AFLP is a DNA fingerprinting method based on selective amplification of restriction fragments. Sequence variations such as SNPs and insertions or deletions can alter restriction fragments and produce different AFLP patterns.

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PCR is widely used in various fields of life sciences such as:

A) Genetic engineering, medical, forensic, agriculture, and environmental studies
B) Only in genetic engineering
C) Only in agriculture
D) Only in medical sciences

AI Explanation

PCR is a versatile technique used to amplify specific DNA sequences and has applications across many life-science fields. These include genetic engineering, medical diagnostics, forensic analysis, agriculture, and environmental studies.

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RAPD (Random Amplification of Polymorphic DNA) is a PCR technique in which:

A) RNA is amplified instead of DNA
B) D. Only one DNA fragment is amplified Only one DNA fragment is amplified
C) DNA segments are amplified randomly
D) Specific DNA sequences are always targeted

AI Explanation

RAPD uses short primers of arbitrary sequence to amplify multiple regions of genomic DNA. The resulting random amplification patterns can reveal genetic polymorphisms between samples.

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Why were different types (variants) of PCR developed?

A) To reduce the number of PCR cycles
B) To eliminate the need for primers
C) To improve performance and specificity and to amplify molecules such as RNA
D) To replace the basic PCR method

AI Explanation

Different PCR variants were developed to address limitations of basic PCR and to improve amplification performance, sensitivity, and specificity. Some variants also allow amplification or analysis of RNA through reverse transcription.

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What is the key feature of nested PCR?

A) Use of two primer sets in two successive PCR reactions
B) Amplification of RNA directly
C) Use of one primer set in a single PCR
D) Use of degenerate primers only

AI Explanation

Nested PCR uses two successive rounds of amplification with two different primer pairs. The second, inner primer pair increases specificity by amplifying a sequence within the first PCR product.

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What is the main purpose of real-time quantitative PCR (qPCR)?

A) To sequence DNA
B) To clone genes
C) To measure the quantity of a target sequence
D) To synthesize RNA

AI Explanation

Real-time quantitative PCR (qPCR) monitors amplification as it occurs using fluorescence. The resulting signal allows the amount of a specific target nucleic-acid sequence in a sample to be quantified.

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Q10

Multiplex PCR is a technique used to

A) D. Separate DNA fragments by size D. Separate DNA fragments by size D. Separate DNA fragments by size D. Separate DNA fragments by size D. Separate DNA fragments by size D. Separate DNA fragments by size D. Separate DNA fragments by size D. Separate DNA fragments by size Separate DNA fragments by size
B) Amplify only one DNA sequence at a time
C) Amplify several different DNA sequences simultaneously
D) Sequence DNA fragments

AI Explanation

Multiplex PCR uses multiple primer pairs in a single PCR reaction to amplify several different target DNA sequences simultaneously. This allows multiple regions to be analyzed efficiently in one reaction.

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Q11

Why are different types of yeast vectors important?

A) They allow geneticists to manipulate genes in yeast
B) They produce antibiotics in yeast
C) They make yeast resistant to viruses
D) hey help yeast grow faster

AI Explanation

Different yeast vectors are designed to carry, replicate, or express foreign DNA in yeast cells. They provide researchers with tools for genetic manipulation and recombinant DNA work in yeast.

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Q12

Why is Saccharomyces cerevisiae important in the history of DNA cloning?

A) It was the organism of choice for DNA cloning in the late 1970s and its genome was fully sequenced in 1996
B) It produces antibiotics
C) It was first discovered in 1996
D) It lives in extreme environments

AI Explanation

Saccharomyces cerevisiae became an important eukaryotic model for recombinant DNA and cloning studies. Its complete genome sequence was published in 1996, making it a major milestone in molecular genetics.

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Q13

Which plasmid vectors are used to maintain foreign DNA in S. cerevisiae?

A) Bacterial cosmids only
B) Viral vectors only
C) Yeast episomal plasmids (YEps) and yeast replicating plasmids (YRps)
D) Mitochondrial plasmids

AI Explanation

YEps and YRps are yeast plasmid vectors that can maintain foreign DNA in Saccharomyces cerevisiae. They contain sequences that allow plasmid maintenance and replication in yeast cells.

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Q14

How do yeast promoters compare to bacterial promoters?

A) They do not control gene expression
B) They are simpler than bacterial promoters
C) They are more complex and have four recognizable structural elements
D) They are identical to bacterial promoters

AI Explanation

Yeast promoters are generally more structurally complex than bacterial promoters. They contain several recognizable regulatory elements that contribute to the control of eukaryotic gene expression.

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Q15

How is exogenous DNA introduced into fungi?

A) By natural transformation
B) By viral infection only
C) By simple diffusion
D) By using spheroplasts or conjugation

AI Explanation

Exogenous DNA can be introduced into fungi by converting cells into spheroplasts, which lack their cell walls and can take up foreign DNA. Conjugation is another method used for transferring genetic material between fungal cells.

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Q16

What does mass spectrometry (MS) primarily involve?

A) Mixing chemicals to form new compounds
B) Observing molecules under a microscope
C) Heating molecules to observe color changes
D) Ionizing molecules in a vacuum and measuring their mass

AI Explanation

Mass spectrometry involves converting molecules into ions under vacuum conditions and separating or detecting them according to their mass-to-charge ratio. This allows researchers to determine molecular masses and identify compounds.

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Q17

Which type of plasmid vector is used to clone DNA in Gram-negative bacteria other than E. coli?

A) Viral vectors
B) Cosmids only
C) Yeast artificial chromosomes
D) Shuttle or broad-host-range plasmids

AI Explanation

Shuttle and broad-host-range plasmids can replicate in multiple bacterial species and are useful for cloning DNA in Gram-negative bacteria other than E. coli. Their host range makes them suitable for genetic manipulation across different bacterial systems.

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Q18

Why are Archaea considered unique among prokaryotes?

A) They thrive in extreme environments like high temperature, pH, or salt
B) They live only in plants
C) They are all disease-causing
D) They cannot survive without oxygen

AI Explanation

Many Archaea are adapted to environments with extreme temperatures, acidity, alkalinity, or salinity. Their distinctive cellular and molecular features allow them to survive conditions that are unfavorable to many other organisms.

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Q19

What are protein microarrays?

A) Miniature devices with proteins arranged on a surface
B) Test tubes containing dissolved proteins
C) Large instruments used for protein purification
D) Devices used only for DNA analysis

AI Explanation

Protein microarrays consist of many different proteins or protein-binding molecules arranged in an organized pattern on a small surface. They allow researchers to study numerous protein interactions or activities simultaneously.

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Q20

Why has cloning in Streptomyces attracted much interest?

A) They are used for vaccine production
B) They grow very fast
C) They produce a large number of antibiotics
D) They are non-pathogenic

AI Explanation

Streptomyces species are well known for producing numerous clinically important antibiotics and other bioactive compounds. Cloning in these organisms is therefore valuable for studying and improving antibiotic production.

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Q21

PCR has facilitated research by enabling:

A) D. Cell culture techniques Cell culture techniques
B) Protein purification
C) Only DNA sequencing
D) Detection of pathogens in plants, animals, and the environment

AI Explanation

PCR can rapidly amplify specific DNA sequences, making it highly useful for detecting pathogens. It has therefore become an important tool in medical, veterinary, agricultural, and environmental research.

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Q22

Single nucleotide polymorphisms (SNPs) are important in physical mapping because:

A) They are RNA sequences used for protein coding
B) They require southern blotting for detection
C) They are single base-pair positions in genomic DNA with different alleles in a population and serve as key sequence markers
D) They are large DNA fragments used in RFLP analysis

AI Explanation

SNPs are variations at single nucleotide positions in genomic DNA among individuals. Because they are abundant and easily associated with specific genomic locations, they are valuable markers for physical and genetic mapping.

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Q23

Gene mapping refers to:

A) Assigning specific genes to particular regions of a chromosome and determining their relative distances
B) Studying protein structure
C) Random amplification of DNA
D) Sequencing the entire genome

AI Explanation

Gene mapping identifies the chromosomal locations of genes and determines their relative positions or distances. This helps establish the organization of genes along chromosomes.