Biotechnology - MCQ Practice Questions

In real-time PCR (qPCR), which fluorescent dye binds to double-stranded DNA and is commonly used for target quantification?

What is the theoretical maximum amplification of a DNA segment after 30 PCR cycles?

Which PCR variant would be most suitable for amplifying DNA from degraded or partially degraded samples such as archaeological or forensic specimens?

In AFLP (Amplified Fragment Length Polymorphism) analysis, what are the two restriction enzymes typically used?

What is the primary disadvantage of using conventional PCR for pathogen detection in clinical diagnostics compared to real-time PCR?

In droplet digital PCR (ddPCR), the sample is partitioned into thousands of micro-compartments. What is the primary advantage of this approach?

Which DNA technology would be most appropriate for detecting point mutations and SNPs in cancer genomics?

In the context of human disease diagnosis, what does the Ct value (Cycle threshold) in qPCR represent?

Which DNA fingerprinting technique using PCR amplification of repetitive sequences is widely used in paternity testing and criminal investigations in India?

What is the primary challenge in developing universal primers for metagenomic studies of microbial communities?

In homozygous versus heterozygous allele detection using allele-specific PCR, which outcome indicates a heterozygous genotype?

Which modification to standard PCR allows amplification of extremely long DNA fragments (>3 kb)?

In the context of environmental microbiology, what does PCR-DGGE (Denaturing Gradient Gel Electrophoresis) primarily assess?

Which PCR-based technique would be most suitable for detecting mutations associated with antibiotic resistance in Mycobacterium tuberculosis in clinical samples?

In the amplification of GC-rich genomic regions, which strategy is most effective to reduce secondary structure formation?

What is the primary role of dNTPs (deoxynucleotide triphosphates) in the PCR reaction mixture?

In next-generation sequencing library preparation, why is PCR amplification of adaptor-ligated DNA fragments critical?

During PCR amplification, the annealing temperature is set based on the Tm (melting temperature) of primers. If primers with Tm of 58°C and 62°C are used in the same reaction, what would be the optimal annealing temperature to ensure efficient amplification of both targets?

A researcher is performing digital PCR (dPCR) for absolute quantification of mutant KRAS alleles in circulating tumor DNA (ctDNA). Compared to conventional qPCR, what is the primary advantage of dPCR in this application?

In a multiplex PCR assay designed to simultaneously amplify 6 different STR (short tandem repeat) loci for forensic DNA profiling, what is the critical consideration that must be addressed?