BIO NMDCAT

The ribosome checks only the codon-anticodon match. The 3'-UUG-5' anticodon will pair with a 5'-AAC-3' codon, incorrectly introducing methionine.

Alternative splicing allows exons to be skipped or combined in different ways, creating diverse protein products from one primary transcript.

Without a protective 3' poly-A tail, newly exported cytoplasmic mRNA molecules are quickly targeted and broken down by cellular exonucleases.

The 2'-OH group on the ribose ring structurally prevents the RNA-DNA hybrid from matching the B-form geometry, forcing it into an A-form configuration.

Puromycin structurally mimics an aminoacyl-tRNA, entering the A site and forming a premature peptide link that causes the peptide chain to detach.

The branch-point sequence contains an adenine residue whose 2'-OH attacks the 5' splice site, a critical step for lariat formation during splicing.

RNA synthesis uses nucleoside triphosphates (ATP, CTP, GTP, UTP); the cleavage of pyrophosphate yields the energy needed for polymerization.

The AAUAAA consensus sequence is recognized by specific endonucleases that cleave the nascent RNA transcript before poly-A polymerase adds the tail.

Short-lived mRNA allows bacteria to quickly shut down old metabolic pathways and transcribe new genes when conditions change.

miRNAs are tiny, non-coding RNA molecules that associate with RISC complexes to pair with matching mRNAs and suppress translation.

The size and weight of an mRNA molecule depend entirely on the length of the specific polypeptide chain it is meant to code for.

Prokaryotes handle all transcription with a single multi-subunit core RNA polymerase that relies on changeable sigma factors for promoter recognition.

The D-loop gets its name from containing dihydrouracil and plays a key structural role in recognition by aminoacyl-tRNA synthetase.

Ribosomal RNA forms the dense, intricately folded catalytic and structural core of both the large and small ribosomal subunits.

Double-stranded RNA is a hallmark of viral replication; eukaryotic cells use the Dicer and RISC pathways to recognize and destroy it.

Specific identity elements scattered across the acceptor stem and variable loops allow the synthetase to accurately identify its matching tRNA.

The structural domains of rRNA inside the A and P binding sites form precise non-covalent contacts to align the tRNA for peptide synthesis.

The signal recognition particle contains a specific small cytoplasmic RNA molecule known as 7SL RNA, which guides newly synthesizing proteins to the ER.

Double-stranded RNA genomes rely on regular hydrogen bonds between complementary base pairs, specifically adenine-uracil and guanine-cytosine.