Go to Section
A-B-C-D-E-F-G-H-I-J-K-L-M-N-O-P-Q-R-S-T-U-V-W-X-Y-Z
- Daclizumab
- Dalton
- Unit of mass equal to one-twelfth the mass of an atom of carbon-12 and therefore close to the mass of a hydrogen atom. [More]
- Deamination
- Removal of an amino group (-NH2) from a compound.
- decapentaplegic (dpp)
- [in Drosophila embryology]
- Decarboxylation
- Removal of carbon dioxide from the carboxyl group of an organic acid.[in cellular respiration]
- Delayed-type Hypersensitivity (DTH)
- Allergic response mediated by T lymphocytes. [More]
- Deletion
- [DNA]
- Denaturation
- (1) Proteins: Alteration of the physical properties and three-dimensional structure by agents too mild to break the peptide bonds. [More] (2) DNA: Separation of the two strands of the double helix (sometimes called "melting").
- Dendritic cells
- [role in presenting antigens to T cells]
- Dendrite
- Branching, usually short, extensions of a neuron in which a generator potential is created.
- Dendrogram
- See phylogenetic tree.
- Denitrification
- Reduction of nitrates to free nitrogen.
- Deoxyribonucleic acid (go to DNA)
- Deoxyribose
- [nucleotide]
- Desmosomes
- Diabetes
- [mellitus (IDDM & NIDDM)] [insipidus]
- Dialysis
- Diastole
- Phase of relaxation of the heart. [More]
- Dietary Reference Intakes (DRIs)
- see RDAs
- Differentiation
- Structural and functional modification of an unspecialized cell into a specialized one.
- Diffusion
- Migration of molecules or ions, as a result of their own random motion, from a region of higher to a region of lower concentration. [Discussion, including facilitated diffusion]
- Digestion
- Breakdown of macromolecules of food by hydrolysis. [Discussion]
- Dihybrid
- Heterozygous at two different gene loci. [examples]
- Dioecious
- Having female sex organs on one plant, male on another. The holly is dioecious. [More]
- Dioxin
- [Description] [in agent orange] [in milk]
- Diploid
- Having two of each kind of chromosome (except for the sex chromosomes); 2n
- [numbers]
- Diptera
- [anatomy]
- Disaccharide
- A sugar (e.g., sucrose) that can be hydrolyzed into two monosaccharides. [Discussion]
- Dissociation
- Separation of ions from a molecule or crystal lattice.[image]
- Distal
- Situated away from the place of origin or attachment.
- Disulfide bridge
- [Protein]
- DNA
- Polymer of deoxyribonucleotides that stores genetic information.
[The Double Helix]
[DNA Replication]
[Recombinant DNA]
[DNA chips]
[DNA ligase]
[DNA polymerase]
[repetitive DNA]
[DNA fingerprinting]
[sequencing by the dideoxy method]
[DNA vaccines]
- DNA polymerase
- An enzyme that catalyzes the polymerization of deoxyribonucleotides to form DNA complementary to a template (either DNA or, in the case of reverse transcriptase, RNA). [More]
- Dolly
- First mammal (a sheep) cloned from an adult cell [more]
- Dopamine
- [as hormone] [as neurotransmitter]
- Down syndrome
- [trisomy 21]
- Drosophila melanogaster
- [diploid number]
[genome size]
[selector genes] [embryonic development]
- Drugs
- Clinical testing
- Ductus arteriosus
- Duplication
- [mutation]
- Dyad
- A chromosome and its duplicate that was synthesized during S phase, while still connected by their single shared centromere. The two chromosomes of the dyad are known as sister chromatids. The chromatids of the dyad separate at anaphase of mitosis and of meiosis II. [Diagram] [in meiosis]
- Dynein
- One of the microtubule motors. [More]