Bios-208 Final Questions And Answers Study Guide With Complete Solutions!!

BIOS-208 FINAL QUESTIONS AND ANSWERS STUDY GUIDE
WITH COMPLETE SOLUTIONS!!
How many elements are essential for human life?
Answers :about 25
What four elements make up 96% of living matter?


Answers :carbon, hydrogen, oxygen, nitrogen
Trace elements


Answers :essential but only needed in small quantities
Atoms in the nucleus


Answers :protons and neutrons
Atoms in the orbitals


Answers :electrons
Isotopes


Answers :same number of protons, different number of neutrons
radioactive isotopes


Answers :nucleus decays spontaneously, giving off particles and energy
Valence shell


Answers :outermost electron shell, determines chemical properties of the atom
cohesion

,Answers :tendency of molecules of the same kind to stick together
adhesion


Answers :tendency of two different kinds of molecules to stick together
structural isomers


Answers :have the same formula but different structure
cis-trans isomers


Answers :have the same covalent bonds but differ in spatial arrangements
enantiomers


Answers :isomers that are mirror images of each other
polysaccharides


Answers :thousands of monosaccharides together
Function of polysaccharides


Answers :storage molecules, structural compounds
starch


Answers :energy storage in plants (potatoes)
glycogen

, Answers :energy storage in animals (muscle)
cellulose


Answers :sugar storage in plants
chitin


Answers :exoskeleton of insects and crustaceans, cell walls of fungi
lipids


Answers :contain many C-C and C-H bonds
Triglycerides


Answers :fats and oils (energy storage)
phospholipids


Answers :bilayer membranes
steroids


Answers :membranes, hormones
saturated fatty acids


Answers :have the maximum number of hydrogen atoms possible and no double
bonds
unsaturated fatty acids


Answers :have one or more double bonds