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biology book online 10th grade

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Question:I can't find these answers in the book,it says they're all true. Some help please? __________________________________________________ Which statement about viruses is FALSE? A. Viruses are subcellular parasites B. Viruses show characteristics of both non-living and living. While they don't carry on respiration, growth or movement, they can reproduce, but only in a living cell. C. Each virus must have a very specific host cell. D. A virus that can infect bacteria cells is called a provirus.

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

Question:10th grade bio cant find in book.. it has to have something to do with the processses called endocytosis and exocytosis

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

Question:10th grade biology question? My friends and I are in 10th grade and we have to do a biology project on bone cells, were doing it on osteoblasts, and skin cells. the skin cell part was really easy, but we need help on the osteoblasts (bone cells) any information?? websites?? resources?? please help us! signed Samantha, Lauren, and Hannah Mrs. Daberko's 10th grade biology class

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.

Question:i had hw in my bio book..but i 4got the book at school

Answers:do it before class starts