biology book online 10th grade
Best Results From Yahoo Answers
From Yahoo Answers
Answers:D) A provirus is a piece of viral DNA in a bacteria's genome I think...viruses were last year... I sooo need to study for the AP test
Answers:A vesicle is just a little sac full of something. It's made of a phospholipid bilayer, just like the cell membrane. In fact vesicles are often made from and then returned to the cell membrane, since they are made out of the same materials. Vesicles are used to transfer things within and between cells. Exocytosis happens when a cell takes in a substance from the extracellular solution; often the cell bends its membrane to envelop the substance, and then pinches that pocked of membrane off to form a closed bubble inside the cell, containing the material from the extracellular solution. Exocytosis is just the opposite. There's a vesicle full of something that the cell wants to export, often a particular kind of protein or a signal molecule. When the vesicle touches the cell membrane, it fuses with it and releases the substance it's carrying into the extracellular environment. Here's a video: http://www.youtube.com/watch?v=4gLtk8Yc1Zc
Answers:Wikipedia is a great place to start. Also, there's a lot of bone cells beyond osteoblasts - osteoprogenitors, osteoclasts, osteocytes... And cartilage cells are very similar; the difference between an osteoblast and a chondroblast is just the amount of blood supplied to it when it forms. You should talk about cartilage cells as well. http://en.wikipedia.org/wiki/Bone Fascinating stuff. Lots of information, you can go as detailed as you wish.
Answers:do it before class starts