If all cells contain the same DNA, how do different types of cells "know" which genes they need to transcribe? What are the molecules that store and process genetic information called? What are the three major procedures of DNA Replication? Explain what occurs during DNA replication. What cata...
Why are animal cells more irregularly shaped than plant cells? How are cells able to respond to signal molecules? Why is most of the supportive tissue in plants made up of dead cells? What are nonsquamous epithelial cells? Why do some cells have microvilli? What is the function of simple ...
Blood is made up of different parts such as red blood cells (红血球) white blood cells and platelets (血小板). Two chemical molecules (分子) on the red blood cells make people's blood different. Scientists mark one molecule "A" and the other molecule "B". According to which and how ...
Sterner, R.W.; Elser, J.J.Ecological Stoichiometry: The Biology of Elements from Molecules to the Biosphere; Princeton University Press: Princeton, NJ, USA, 2002. [Google Scholar] Mensah, S.; Glèlè Kakaï, R.; Seifert, T. Patterns of biomass allocation between foliage and woody structur...
and egress of certain molecules. This organelle is the largest in any cell, accounting for as much as 10 percent of a cell's volume, and is readily visible using any microscope powerful enough to reveal cells themselves. Scientists have known of the existence of the nucleus since the 1830s...
Unlike TEMs, which produce images of the insides of materials, and SEMs, which show up 3D surfaces, STMs are designed to make detailed images of the atoms or molecules on the surface of something like a crystal. They work differently to TEMs and SEMs too: they have an extremely sharp ...
1. Prosthetic Groups: Some proteins in our body require phosphorus-containing molecules to perform certain biological functions. These are cofactors or prosthetic groups that can be covalently attached to the protein, adding phosphorus indirectly. 2. Phosphorylation: Phosphate groups get attached to amino...
Fuel cells are a bit like a cross between an internal-combustion engine and battery power. Like an internal-combustion engine, they make power by using fuel from a tank (though the fuel is pressurized hydrogen gas rather than gasoline or diesel). But, unlike an engine, a fuel cell doesn'...
Or it might fight cancer by triggering the bodys' immune response to make molecules that signal cancer cells to die.或者，它可能通过触发身体的免疫反应，使分子发出信号使癌细胞死亡，以此来对抗癌症。But if that sounds really good to you, maybe don't go downing like ten straight pineapples just...
Sign Up Subjects Science Organelles How do cells transport small, lipid-soluble molecules across the cell membrane?Question:How do cells transport small, lipid-soluble molecules across the cell membrane?Semi-Permeable Membranes:The cell membrane is a semi-permeable membrane meaning wh...