BLOCK in Biological Definition

Antibody

... products prime for phagocytosis by macrophages and other cells, block viral receptors and stimulate other immune responses such as the complement pathway . Antibodies that recognize viruses can block these directly by their sheer size. The virus will be unable to dock to a ...

Competitive inhibitor

... In biochemistry one distinguishes two ways in which a molecule may block the action of an enzymes : competitive and noncompetitive inhibition. In competitive inhibition , the molecule acts on the same active site as ...

Lac repressor

... at the entrace. The reason the lac repressor can do this is because it can take two forms. In one of these two forms it can lock onto the DNA and block RNA polymerase. Electrostatic forces hold it in place. When lactose is present the lac repressor hooks up to lactose and changes shape and ...

Long-term potentiation

... depression memory Notes ^ PMID 12740104 ^ Mayer ML, Westbrook GL, Guthrie PB (1984) "Voltage-dependent block by Mg2+ of NMDA responses in spinal cord neurones". Nature 309 (5965), 261-3. PMID 6325946 ^ Rogan MT, Staubli UV, LeDoux JE (1997) ...

Reverse genetics

... is Morpholino antisense oligos. While RNAi acts by directing cellular systems to degrade target messenger RNA (mRNA), Morpholinos bind and block access to the target mRNA without requiring the activity of cellular proteins and without necessarily accelerating mRNA degradation. Morpholinos are ...

Unsolved problems in biology

... by a cell or organ at a particular time and under specific conditions? What is the complete function of the regulator genes ? The building block of life may be a precursor to a generation of electronic devices and computers , but what are the electronic properties of DNA? Does Junk DNA ...