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Advanced Placement (AP) Biology (also known as AP Bio) is an Advanced Placement biology course and exam offered by the College Board in the United States. For the 2012–2013 school year, the College Board unveiled a new curriculum with a greater focus on "scientific practices".
6469 20423 Ensembl ENSG00000164690 ENSMUSG00000002633 UniProt Q15465 Q62226 RefSeq (mRNA) NM_000193 NM_001310462 NM_009170 RefSeq (protein) NP_000184 NP_001297391 NP_033196 Location (UCSC) Chr 7: 155.8 – 155.81 Mb Chr 5: 28.66 – 28.67 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Sonic hedgehog protein (SHH) is a major signaling molecule of embryonic development in humans and ...
A protein complex or multiprotein complex is a group of two or more associated polypeptide chains. Protein complexes are distinct from multidomain enzymes, in which multiple catalytic domains are found in a single polypeptide chain. [1] Protein complexes are a form of quaternary structure.
Also called functionalism. The Darwinian view that many or most physiological and behavioral traits of organisms are adaptations that have evolved for specific functions or for specific reasons (as opposed to being byproducts of the evolution of other traits, consequences of biological constraints, or the result of random variation). adaptive radiation The simultaneous or near-simultaneous ...
Ovalbumin (abbreviated OVA [1]) is the main protein found in egg white, making up approximately 55% of the total protein. [2] Ovalbumin displays sequence and three-dimensional homology to the serpin superfamily, but unlike most serpins it is not a serine protease inhibitor. [3]
In unfertilized eggs, transcripts are still strictly localized at the tip, but immediately after fertilization, a small mRNA gradient is formed in the anterior 20% of the eggs. Another report documents a mRNA gradient up to 40%. nanos mRNA also attaches to a Drosophila egg's cytoskeleton but is concentrated at the posterior end of the egg.
Cytoplasmic incompatibility (CI) is a mating incompatibility reported in many arthropod species that is caused by intracellular parasites such as Wolbachia.These bacteria reside in the cytoplasm of the host cells (hence the name cytoplasmic incompatibility) and modify their hosts' sperm in a way that leads to embryo death unless this modification is 'rescued' by the same bacteria in the eggs.
Examples are numerous: disproportionate numbers of spermatozoa during fertilization compared to one egg, large number of neurotransmitters released during neuronal communication compared to the number of receptors, large numbers of released calcium ions during transient in cells, and many more in molecular and cellular transduction or gene ...