BIOLOGY 212 - KUKDAY - EXAM 1 QUESTIONS AND ANSWERS

BIOLOGY 212 - KUKDAY - EXAM 1 QUESTIONS AND
ANSWERS

Ionic Bond – Answers




- What type of Bond is pictured here?

Adenine = 35

Guanine = 15
Cytosine = 15
Thymine = 35

A=T C=G - Answers - A certain DNA molecule is said to have a guanine content of
15%. What would be the percentage of adenine in the molecule?

Oil - Answers




- Is this phospholipid bilayer in water or oil?

d. NH3 - Answers - Which one of these is a polar molecule?
a. O2
b. CO2
c. CH4
d. NH3

a. A molecule in which the bond dipoles present do not cancel each other out and thus
results in a molecular dipole

, b. CO2 is a linear molecule with 2 bond dipoles that are equal and oppositely directed
therefor the bond polarities cancel and the molecule is non-polar - Answers - What
makes a molecule polar?

Non-polar - Answers




- What type of amino acid side chain is depicted in this image?

Basic - Answers




- Is this amino acid side chain acidic or basic?

a. A phosphate group
b. A 5 carbon sugar
c. A nitrogenous base - Answers - What 3 things make up a nucleotide?

Hydrogen Bonds - Answers - What kind of bond forms between DNA base pairs?

c. Peptide bond - Answers - What type of bond forms between amino acids in a
polypeptide chain?
a. Ionic bond
b. Covalent bond
c. Peptide bond
d. Glycosidc bond