MCB 250 Pre Lectures Exam Questions And
Correct Answers
University of Illinois Microbiologist Carl Woese showed us the relationship between all
life forms on the planet and taught us that they fall into three domains, the Bacteria,
Archaea and Eucarya. His "tree of life" is based on the DNA sequence comparison of the
gene encoding what? - ANSWER 16s/18s small ribosomal subunit
Weak non-covalent bonds make a major contribution to all of the following except: -
ANSWER Peptide bonds that link amino acids within a protein.
Which of the following statements is true of van der Waals bonds? - ANSWER can occur
between two closely spaced atoms
Which one of the following statements is true of hydrogen bonds? - ANSWER In cells, the
most biologically significant hydrogen bonds involve O and/or N atoms.
Which one of the following statements is true of hydrophobic "bonds"? - ANSWER occur
in aqueous solutions from the tendency of water to exclude nonpolar group
In a linear DNA molecule, the two ends of a single strand are designated as: - ANSWER
5' and 3'
Which of the following statements is NOT correct? - ANSWER Pyrimidines have two
rings; purines have one.
In 1928, Frederic Griffith showed that: - ANSWER A chemical derived from dead
bacteria can produce heritable changes in the traits of living cells.
Using the Henderson-Hasselbach equation, you can calculate which of the following: -
ANSWER the ratio of protonated to depronated species of a compound.
The proton concentration of a pH=6 is X times the proton concentration of a pH=8
solution.
x= - ANSWER 100
Experimental studies reveal that double-stranded DNA can exist in three different
helical forms known as A, B, and Z DNA. Why do molecular biologists primarily focus on
B DNA? - ANSWER B DNA is a good approximation of the structure of DNA in cells
Which of the following is NOT true regarding the denaturation and reannealing of
double-stranded DNA molecules? - ANSWER Single stranded DNAs can only anneal to
one another if they are 100% identical in nucleotide sequence
Correct Answers
University of Illinois Microbiologist Carl Woese showed us the relationship between all
life forms on the planet and taught us that they fall into three domains, the Bacteria,
Archaea and Eucarya. His "tree of life" is based on the DNA sequence comparison of the
gene encoding what? - ANSWER 16s/18s small ribosomal subunit
Weak non-covalent bonds make a major contribution to all of the following except: -
ANSWER Peptide bonds that link amino acids within a protein.
Which of the following statements is true of van der Waals bonds? - ANSWER can occur
between two closely spaced atoms
Which one of the following statements is true of hydrogen bonds? - ANSWER In cells, the
most biologically significant hydrogen bonds involve O and/or N atoms.
Which one of the following statements is true of hydrophobic "bonds"? - ANSWER occur
in aqueous solutions from the tendency of water to exclude nonpolar group
In a linear DNA molecule, the two ends of a single strand are designated as: - ANSWER
5' and 3'
Which of the following statements is NOT correct? - ANSWER Pyrimidines have two
rings; purines have one.
In 1928, Frederic Griffith showed that: - ANSWER A chemical derived from dead
bacteria can produce heritable changes in the traits of living cells.
Using the Henderson-Hasselbach equation, you can calculate which of the following: -
ANSWER the ratio of protonated to depronated species of a compound.
The proton concentration of a pH=6 is X times the proton concentration of a pH=8
solution.
x= - ANSWER 100
Experimental studies reveal that double-stranded DNA can exist in three different
helical forms known as A, B, and Z DNA. Why do molecular biologists primarily focus on
B DNA? - ANSWER B DNA is a good approximation of the structure of DNA in cells
Which of the following is NOT true regarding the denaturation and reannealing of
double-stranded DNA molecules? - ANSWER Single stranded DNAs can only anneal to
one another if they are 100% identical in nucleotide sequence
