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Polar bodies serve to eliminate one half of the diploid chromosome set produced by meiotic division in the egg, leaving behind a haploid cell. To produce the polar bodies, the cell must divide asymmetrically, which is fueled by furrowing (formation of a trench) near a particular point on the cell membrane.
(In mammals, the first polar body normally disintegrates before dividing, so only two polar bodies are produced. [citation needed]) In mammals, the first part of oogenesis starts in the germinal epithelium, which gives rise to the development of ovarian follicles, the functional unit of the ovary.
The chemical structure of DNA is insufficient to understand the complexity of the 3D structures of DNA. In contrast, animated molecular models allow one to visually explore the three-dimensional (3D) structure of DNA. The DNA model shown (far right) is a space-filling, or CPK, model of the DNA double helix. Animated molecular models, such as ...
The skeletal formula of the antidepressant drug escitalopram, featuring skeletal representations of heteroatoms, a triple bond, phenyl groups and stereochemistry. The skeletal formula, line-angle formula, bond-line formula or shorthand formula of an organic compound is a type of molecular structural formula that serves as a shorthand representation of a molecule's bonding and some details of ...
Two more withdrew because senators took issue with their prickly personalities: John Bolton, one of George W. Bush's nominees for ambassador to the United Nations, was undone by accusations that ...
An Australian computer scientist who claimed he invented bitcoin was on Friday accused of contempt of court after he filed a 911 million-pound ($1.18 billion) lawsuit against Twitter founder Jack ...
Stereochemistry, a subdiscipline of chemistry, studies the spatial arrangement of atoms that form the structure of molecules and their manipulation. [1] The study of stereochemistry focuses on the relationships between stereoisomers, which are defined as having the same molecular formula and sequence of bonded atoms (constitution) but differing in the geometric positioning of the atoms in space.
The judge in Georgia nursing student Laken Riley’s murder trial issued a warning to the courtroom about graphic body cam footage about to be shown -- prompting several to get up and leave and ...