Simple Questions with No Answers. By Natalie Wolchover | September 13, 2012 03:28pm ET Credit: Public domain Ask a physicist about the radius of the black hole at the center of the galaxy and she'll tell you more than you wanted to know.
Ask her how a bicycle works, and she'll shrug. It may surprise you to learn that scientists lack explanations for some of the simplest questions you might think to ask. Read on for a taste of the many seemingly mundane questions no know can answer. Grandma's Experiences Leave Epigenetic Mark on Your Genes. Why can’t your friend “just get over” her upbringing by an angry, distant mother?
Why can’t she “just snap out of it”? The reason may well be due to methyl groups that were added in childhood to genes in her brain, thereby handcuffing her mood to feelings of fear and despair. Of course, it is generally not possible to sample the brains of living people. But examining blood samples in humans is routine, and Szyf has gone searching there for markers of epigenetic methylation. Sure enough, in 2011 he reported on a genome-wide analysis of blood samples taken from 40 men who participated in a British study of people born in England in 1958.
All the men had been at a socioeconomic extreme, either very rich or very poor, at some point in their lives ranging from early childhood to mid-adulthood. Timing, in other words, matters. A case study in the epigenetic effects of upbringing in humans can be seen in the life of Szyf’s and Meaney’s onetime collaborator, Frances Champagne.
The Mark Of Cain. Biology Tips Biology Reading Skills. List of MythBusters episodes. Index of /bio. Tree of Life Web Project. The Tree of Life Web Project (ToL) is a collaborative effort of biologists and nature enthusiasts from around the world.
On more than 10,000 World Wide Web pages, the project provides information about biodiversity, the characteristics of different groups of organisms, and their evolutionary history (phylogeny). Each page contains information about a particular group, e.g., salamanders, segmented worms, phlox flowers, tyrannosaurs, euglenids, Heliconius butterflies, club fungi, or the vampire squid. ToL pages are linked one to another hierarchically, in the form of the evolutionary tree of life.
Starting with the root of all Life on Earth and moving out along diverging branches to individual species, the structure of the ToL project thus illustrates the genetic connections between all living things. Evolution of Evolution - 150 Years of Darwin's "On the Origin of Species" BioLogica™ main page. AP Bio activities and resources. Sign In - AP Teacher Communities.
Bacterial Identification Virtual Lab. Classroom Activities.
The Cell 5e. Home Welcome to the Companion Website for The Cell: A Molecular Approach, Fifth Edition, by Geoffrey M.
Cooper and Robert E. Hausman, published by ASM Press and Sinauer Associates. This site is designed to help you review and master key concepts, facts, processes, and terminology introduced in the textbook through a variety interactive learning resources. To get started, select a chapter and a category from the pull-down menus above and click "Go," or click a category in the list on the left. System Requirements The animations, micrographs, and videos on this website require Adobe Shockwave Player (version 11 or above), Adobe Flash Player (version 7 or above) and Apple QuickTime Player (version 7 or above). In addition, JavaScript is required for full site functionality. Credits Quizzes and Problems Robert McGehee and Brian Storrie, University of Arkansas for Medical Sciences Animations and Micrographs Sumanas, Inc., www.sumanasinc.com.