You purified fragments of nuclear envelope from human fibroblasts by biochemical fractionation. you first decide to use electron microscopy to test for the presence of the nuclear lamina on these envelope fragments. which of the following structures would suggest the presence of the nuclear lamina? "little bumps", presumably membrane proteins, at the surface of the inner membrane two phospholipids bilayers ~300 and ~700 nm fibers an organized meshwork of ~ 10 nm fibers large pores that span through both nuclear membranes

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.