Iris Diaphragm Control At Biology Glossary

What is it? small lever that allows the size of the opening to change in order to regulate the amount of light passing through it.

Bio Definition Added By: Henry

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Other Similar Biology Terms:

Bio Term Chelator is A substance that binds particular ions, removing them from solution. Some chelators are relatively nonspecific, binding to a variety of ions with similar charge, and other chelators bind much more strongly to specific ions. A few examples include the divalent ion chelators citrate and EDTA, the calcium chelator EGTA, and the iron chelator desferrioxamine. For more about chelators, see: http://www.sigmaaldrich.com/Brands/Fluka___Riedel_Home/Bioscience/BioChemika_Ultra/Chelators.html.

Bio Term recessive allele is An allele whose phenotypic effect is not expressed in a heterozygote.

Bio Term Enrichment is A condition which increases the proportion of a particular organism or mutant strain from a mixed population. For example, a penicillin enrichment kills growing cells and allows mutants unable to grow under a particular condition to survive; however, for each round of penicillin enrichment typically only 1% of the growing cells are killed, thus each round of enrichment increases the mutant ratio about 100-fold. Compare with selection.

Bio Term probability is The expectation of the occurrence of a particular event.

Bio Term Rolling circle (sigma) replication is A type of DNA replication where a replication fork moves around a circular DNA molecule, producing a single-stranded concatamer (much like the way toilet paper peels off the roll). The resulting single-stranded DNA may become double-stranded by the synthe