By Brenda Walpole, Ashby Merson-Davies, Leighton Dann, Peter Hoeben, Mark Headlee
A brand new identify that gives an in-depth research of all subject matters coated within the IB syllabus, getting ready scholars with the talents had to achieve the exam. Biology for the IB degree is a accomplished new publication written through an skilled writer crew. The textual content bargains an in-depth research of all issues coated within the IB syllabus, getting ready scholars with the abilities had to achieve the exam. hyperlinks to idea of data subject matters are incorporated. beneficial properties comprise: basically said studying ambitions at the beginning of every part; quickly questions all through each one bankruptcy; available language for college kids in any respect degrees; exam-style questions; and a word list and index. The accompanying CD-ROM includes 8 chapters masking the syllabus recommendations, pattern exam papers and version solutions.
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Interpreting images requires care, and what we perceive in a particular image is likely to be inﬂuenced by these techniques as well as our own expectations. 9. Why do some mitochondria appear cylindrical and others circular? 2 Plant cells have a single central vacuole. 11. How many vacuoles can you see? How can you explain this? Role of the extracellular components of cells The extracellular matrix (ECM) of animal cells forms a supporting network for the cell membrane and allows adjacent cells to attach to one another and communicate.
Most of the matrix is made of collagen ﬁbres and ‘sticky’ glycoproteins, which are made in the Golgi apparatus from sugars and proteins. Cell walls form the extracellular component of all plant cells. They are made of cellulose ﬁbres embedded in a glycoprotein matrix which helps maintain the shape of each cell, resists osmotic pressure and allows cells to communicate. Plant cells ﬁt closely together to form tissues and their walls help to bind them to one another. Recent research suggests that the ECM may be important in interactions between cells that cause them to diﬀerentiate and move.
In plants, the xylem carries dissolved minerals from the roots to the leaves, while the phloem transports soluble sugars up and down the plant. Many animals have blood as their transport medium. Blood is predominantly water, and the blood plasma carries dissolved sugars, amino acids and carbon dioxide as well as many other solutes. 2. Property Reason Consequence cohesion Hydrogen bonds hold water molecules together. Water can travel in continuous columns, for example in the stems of plants, and act as a transport medium.