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...
How does the structure of prokaryotic cells enable metabolic functions to be carried out? How do cells sense chemoattractants/chemorepellants and also explain the molecules involved in the process? Describe how cells communicate via the local signaling mechanism. ...
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...
Mesothelioma cells make fibulin-3, but it’s also found in other cancers like cervical cancer. This makes fibulin-3 blood tests helpful indicators of mesothelioma but not definitive. Similarly, the Mesomark blood test looks for molecules called soluble mesothelin-related peptides. Mesothelioma cells...
First, water molecules (two atoms of hydrogen and one atom of oxygen joined together) naturally stick to one another, so they clump together in big droplets on the window. The forces that make them do this are called cohesive forces (and the process involved is called cohesion). Second, ...
Oxygen is important to the third step of the aerobic cellular respiration cycle. During this step, electron transport molecules carry electrons to the cells, where they are harvested and used for ATP production. After the electrons are used, they combine with oxygen and hydrogen to form water an...
Whenever there is something you need to pay attention to — for example, the sound of the doorbell — receptors in your sense organs activate nerve cells leading to the brain. Tiny tunnels in the membranes of neurons open, allowing positively charged molecules, or ions, to leak into the cell...
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 ...
such as molecules with particular properties in drug discovery, or materials with the characteristics needed in batteries or solar cells. It can sift through piles of data such as those produced by particle colliders or robotic telescopes, looking...
Being exposed toair pollutionand smoking cigarettes can also fuel the formation of wrinkles by inducingoxidative stress, a state of imbalance between cells' production and elimination of harmful molecules called free radicals, Jaliman noted.