BIO NMDCAT

Lipoproteins feature a hydrophilic protein shell that encloses a hydrophobic lipid core, allowing transport in aqueous blood plasma.

Glycoproteins and glycolipids extend their sugar chains outward to form the glycocalyx, which mediates cellular identification.

N-linked glycosylation begins in the lumen of the rough endoplasmic reticulum as polypeptides are being translated by ribosomes.

Conjugated molecules like glycoproteins and glycolipids are stable because their components are bound via permanent covalent linkages.

The Golgi apparatus contains specific glycosyltransferase enzymes that trim and add sugar residues to complete glycoprotein processing.

Hemoglobin is a metalloprotein containing an iron-porphyrin ring system called a heme group as its functional prosthetic group.

Conjugated molecules consist of a basic biomolecule chemically bound to a distinct, non-protein or structural component termed a prosthetic group.

Glycolipids are formed when carbohydrate groups (oligosaccharides) attach covalently to fatty acids or glycerol backbones within membranes.

Immunoglobulins (antibodies) and cell-surface receptors are functionally classified as glycoproteins due to their oligosaccharide chains.

Histones are basic proteins that bind tightly to the acidic phosphate backbone of DNA, creating a conjugated nucleoprotein complex.

Telomerase is a reverse transcriptase that carries its own internal RNA molecule to serve as a structural template for lengthening chromosome ends.

The creation of a cryptic splice site inside an intron leads the spliceosome to misidentify the intron boundaries, incorporating junk sequence into the mature mRNA.

Promoter hypermethylation creates a structural barrier that blocks the binding of transcription factors and RNA polymerase, shutting down transcription.

Converting a CAA codon (coding for glutamine) into a UAA codon introduces a premature stop signal, producing a shorter, tissue-specific protein.

Replacing the 2'-OH group removes the nucleophile required for autophilic attack, making the synthetic RNA highly resistant to ribonuclease degradation.

Small nucleolar RNAs (snoRNAs) reside within the nucleolus and act as guide RNAs that direct the biochemical modification and splicing of pre-rRNA.

In historical genetic code experiments, UUU was discovered to be the specific codon that codes for the amino acid phenylalanine.

The sigma subunit is a transient initiation factor that grants the core prokaryotic RNA polymerase structural specificity to bind promoters.

In basic solutions, the 2'-OH group of ribose is deprotonated, launching a nucleophilic attack on the adjacent phosphorus atom that breaks the RNA backbone.