BIO 201 Homework 1 | Questions and Answers

BIO 201 Homework 1 | Questions and Answers Rank the following levels of biological organization from the lowest level of complexity to the highest level of complexity 1. Oxygen atom 2. DNA molecule 3. Nerve cell 4. Nervous tissue 5. Brain 6. Fish 7. School of fish 8. Group of dolphins, fish, and algae 9. Pacific Ocean and inhabitants 10. Planet Earth Carbon has a total of __ e-, __ are in the valence shell and __ are in the 1s orbital 6,4,2 Nitrogen has a total of __ e-, __ are in the valence shell and __ lie in the p orbitals 7,5,3 Hydrogen has a total of __ e-, __ are in the valence shell and __ lie in the p orbitals 1,1,0 They have the same number of electrons in their outermost shells. Nitrogen and Phosphorous They have two electron shells Carbon and Nitrogen Their outermost electron shell is full Helium and Argon They have one electron shell Hydrogen and Helium They have three electron shells Sodium and Chlorine Covalent Bonds -Strong chemical bond due to the sharing of electrons. -Bonds between hydrogen and oxygen atoms within a water molecule. Ionic bonds -Electrons are transferred between two atoms creating positively and negatively charged atoms, which are then attracted to one another. -Na+ + Cl- - NaCl Hydrogen Bonds -Bonds between charged molecules or portions of a molecule -weak attraction between slightly charged parts of molecules, which are readily broken and reformed -bonds between water molecules A polar covalent bond is created when bonded atoms have unequal pull on the shared electron, so that the electron spends more time around one atom than the other. The unequal sharing of electrons between oxygen and hydrogen atoms within a water molecule makes water a ____ molecule. Polar