BIOS 1700 EXAM 1 CHAPTER 1-5 EXAM
QUESTIONS AND ANSWERS GRADED A+
2025/2026
Shell - ANS - an energy level of an atom
- can contain several orbitals
orbital - ANS a region of space where an electron is present most of the time
What do rows and columns tell us about the atoms - ANS The columns show us what groups
have similar valence electrons and the row tells us the number of shells.
Covalent bond - ANS Two atoms sharing the same vlanence electron
Ionic bond - ANS Is the complete transfer of valence electron(s) between atoms.
Hydrogen bond - ANS A hydrogen atom covalently bound to an electonegative atom interacts
with an electonegative of another molecule
What makes a covalent bond polar? - ANS The electrons shared by the atoms spend a greater
amount of time, on the average, closer to the Oxygen nucleus than the Hydrogen nucleus
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, What does polar covalent bonds have to do with water solubility and hydrophilicity vs.
hydrophobicity? - ANS Hyrdophilic compunds are polar which means the dissolve readily in
water where as hydrophobic compounds are nonpolar and arrange themselves to minimize
contact with the water.
Carbon's important properties - ANS - 4 bounds in tetrahedral configuration
- rotation around single bonds
- can form long chain or ring structures
structural components of DNA - ANS Proteins-chains of amino acids linked by peptide bonds
Nucleic Acids - chains of nucleotides linked by phosphodiester bonds
Carbohydrates - chains of sugars linked by glycosidic bonds
Basic parts of a nucleotide - ANS - 5-carbon sugar
- phosphate
- base
whats attached to the 5' carbon - ANS Phosphate group
whats attached to the 3' carbon - ANS hydroxyl group
differences in nucleotides used in RNA and DNA - ANS - DNA is the genetic material in all
organisms and has bases A,T,G,C
- RNA is the key player in protein synthesis and the regulation of gene expression
The role of the sugar and phosphate in DNA - ANS Backbone
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
QUESTIONS AND ANSWERS GRADED A+
2025/2026
Shell - ANS - an energy level of an atom
- can contain several orbitals
orbital - ANS a region of space where an electron is present most of the time
What do rows and columns tell us about the atoms - ANS The columns show us what groups
have similar valence electrons and the row tells us the number of shells.
Covalent bond - ANS Two atoms sharing the same vlanence electron
Ionic bond - ANS Is the complete transfer of valence electron(s) between atoms.
Hydrogen bond - ANS A hydrogen atom covalently bound to an electonegative atom interacts
with an electonegative of another molecule
What makes a covalent bond polar? - ANS The electrons shared by the atoms spend a greater
amount of time, on the average, closer to the Oxygen nucleus than the Hydrogen nucleus
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, What does polar covalent bonds have to do with water solubility and hydrophilicity vs.
hydrophobicity? - ANS Hyrdophilic compunds are polar which means the dissolve readily in
water where as hydrophobic compounds are nonpolar and arrange themselves to minimize
contact with the water.
Carbon's important properties - ANS - 4 bounds in tetrahedral configuration
- rotation around single bonds
- can form long chain or ring structures
structural components of DNA - ANS Proteins-chains of amino acids linked by peptide bonds
Nucleic Acids - chains of nucleotides linked by phosphodiester bonds
Carbohydrates - chains of sugars linked by glycosidic bonds
Basic parts of a nucleotide - ANS - 5-carbon sugar
- phosphate
- base
whats attached to the 5' carbon - ANS Phosphate group
whats attached to the 3' carbon - ANS hydroxyl group
differences in nucleotides used in RNA and DNA - ANS - DNA is the genetic material in all
organisms and has bases A,T,G,C
- RNA is the key player in protein synthesis and the regulation of gene expression
The role of the sugar and phosphate in DNA - ANS Backbone
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
