Genetic Engineering And Biotechnology

Reverse transcriptase is an enzyme that synthesizes complementary DNA (cDNA) from an RNA template. This process is a key step in the life cycle of retroviruses like HIV.

Metabolomics is the scientific study of chemical processes involving metabolites, which are small molecules found within cells, biofluids, or tissues. It aims to measure and analyze the unique chemical fingerprints left by these cellular processes.

A contig is a set of overlapping DNA sequences that together represent a consensus sequence for a portion of a genome. Contigs are essential in genome assembly and sequencing projects.

- (A) Correct: DNA microarrays are used to probe immobilized DNA sequences via hybridization to study gene expression.
- (B) Correct: Differential centrifugation separates cellular organelles based on sedimentation rates.
- (C) Correct: Essential amino acids are not synthesized by humans but can be synthesized by microbes and are obtained through diet.
- (D) Incorrect: Equilibrium constants are specific for each reaction, but this statement does not align with the context provided.

An open reading frame (ORF) is a sequence of DNA that begins with a start codon and extends without interruption (no stop codon) to a stop codon, representing the coding sequence for a protein.

The Shine-Dalgarno sequence is a ribosomal binding site in bacterial mRNA, located upstream of the start codon. It aligns the ribosome with the mRNA for translation initiation.

The exome, which includes all coding regions of the human genome, constitutes approximately 1% of the total genome. Despite its small size, it holds crucial information for protein synthesis and is a key focus in genetic studies.

A consensus sequence represents the most common nucleotide or amino acid found at each position in a set of aligned sequences. It is often used in bioinformatics to identify conserved regions in DNA, RNA, or proteins.