MCDB 1A UCSB midterm 1 Exam Study
Guide Solutions
Condensation reaction - ANSWER-(also called dehydration) results in the covalent bonds between
between monomers. A molecule of water is released when each covalent bond is formed. Polymers form
only if water molecules are removed and energy is a...
Frederick Griffith - ANSWER✔✔-demonstrated that some substance in cells can cause heritable changes
in other cells. Dead pneumonia cells continued to cause heritable change in other cells.
Oswald Avery - ANSWER✔✔-Identified the substance causing bacterial transformation. We now know
that the gene for the enzyme that catalyzes the synthesis of polysaccharide capsule, which makes the
bacterial colony look "smooth," was transferred into the R cells during transformation.
Hershey and Chase - ANSWER✔✔-discovered that DNA, not protein, enters bacterial cells and directs the
assembly of new viruses.
Chargraffs rule - ANSWER✔✔-In any DNA sample, the amount of adenine equals the amount of thymine,
and the amount of guanine equals the amount of cytosine. As a result, the total abundance of purines
(A+G) equals the total abundance of pyramidines (T+C)
Watson and Crick - ANSWER✔✔-proposed that the two strands in dna are antiparallel
Polynucleotide - ANSWER✔✔-phosphate group at 5' end and OH- group at 3' end. 5' end is paired with
the 3'end of another nucleotide
Semiconservative DNA replication - ANSWER✔✔-each parent strand serves as a template for a new
strand, and the two new DNA molecules have one old and one new strand. 2 steps- the double-helix is
unwound to separate the two template strands and make them available for new base pairing. As new
nucleotides form complementary base pairs with the template DNA, they are covalently linked together
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