BIO 330 EXAM 2 QUESTIONS AND ANSWERS 2024/2025
LATEST UPDATED A COMPLETE EXAM SOLUTION WITH
CORRECT VERIFIED ANSWERS BEST RATED A+ FOR SUCCESS
what is the DNA nucleotide made of? - CORRECT ANSWERS 5-carbon sugar (2'-
deoxyribose), phosphate, N-containing base
which bases are purines and pyrimidines, respectively? explain why they are classified this way.
- CORRECT ANSWERS purines - adenine (A) and guanine (G): have C and N forming 2
rings
pyrimidines - thymine (T) and cytosine (C): have C and N forming single ring
Which base is found only in RNA? - CORRECT ANSWERS Uracil
in his study of DNA structure, what major findings were made by Erwin Chargaff? - CORRECT
ANSWERS -amount of A relative to G differs among species (purines NOT show
stoichiometric relationships). purine will base pair with specific pyrimidine
A=T G=C
Linus Pauling built a DNA model and it failed. what was wrong with his proposed model? -
CORRECT ANSWERS negatively charged phosphate groups facing inward would repel
each other and DNA would be unstable
in their study of DNA structure, which three points did Watson and Crick focus one? -
CORRECT ANSWERS DNA size, shape (helix or parallel), bonding requirements (how
strands help together)
what type of DNA did Maurice Wilkins laboratory work with? - CORRECT ANSWERS
dehydrated DNA
What type of DNA did Rosalind Franklin's laboratory work with? - CORRECT ANSWERS
dry and wet DNA
,BIO 330 EXAM 2 QUESTIONS AND ANSWERS 2024/2025
LATEST UPDATED A COMPLETE EXAM SOLUTION WITH
CORRECT VERIFIED ANSWERS BEST RATED A+ FOR SUCCESS
based on Franklins data, what were the calculated principal dimensions of the DNA molecule? -
CORRECT ANSWERS length of full twist = 3.4nm
distance between adjacent bases = 0.34nm
diameter of DNA = 2nm
based on Franklins data, how many bases are per turn of the helix? - CORRECT
ANSWERS 3.4nm/0.34nm= 10 bases
based on Franklins data, what was the orientation of phosphate groups in the DNA molecule? -
CORRECT ANSWERS outward
based on Franklins data, how many strands were thought to be twisted into a helix? -
CORRECT ANSWERS 2, 3, or 4 parallel strands
who recognized the significance of Franklins data? - CORRECT ANSWERS Maurice
Wilkins
How many strands is DNA molecule made of and in which direction do DNA strands run? -
CORRECT ANSWERS 2 helically twisted strands running in opposite direction
(antiparallel)
which groups are located on the outside of the DNA molecule? - CORRECT ANSWERS
sugar-phosphate
where are nitrogenous bases located in the DNA molecule, and what hold the bases together? -
CORRECT ANSWERS inside, hydrogen bonds
, BIO 330 EXAM 2 QUESTIONS AND ANSWERS 2024/2025
LATEST UPDATED A COMPLETE EXAM SOLUTION WITH
CORRECT VERIFIED ANSWERS BEST RATED A+ FOR SUCCESS
which bacterial DNA polymerase was described by Aurthur Kornberg? - CORRECT
ANSWERS DNA polymerase I
explain what the origins of replication (ori) is - CORRECT ANSWERS binding sites for
proteins that initiate the replication process
which 2 elements were identified in an acidic compound that was isolated from the nucleus by
Johann Miescher? - CORRECT ANSWERS nitrogen and phosphorus
why proteins were thought to encode information that pertains to inheritable traits? -
CORRECT ANSWERS - inheritable traits are diverse, and therefore molecules that
encode these traits must be diverse
-proteins made of 20 amino acids, structurally diverse
which 2 macromolecules make the Bacteriophage structure? - CORRECT ANSWERS
protein and DNA
In a cell, which macromolecules are labeled 35S-methionine and 32P, respectively? -
CORRECT ANSWERS proteins and DNA
Describe the Hershey-Chase experiments. what conclusions were made from this study? -
CORRECT ANSWERS - radioactively labeled bacteriophages:
-radioactive 35S incorporated into bacteriophage proteins
-radioactive 32P incorporated into bacteriophage DNA
-all radioactive viruses to infect bacteria
LATEST UPDATED A COMPLETE EXAM SOLUTION WITH
CORRECT VERIFIED ANSWERS BEST RATED A+ FOR SUCCESS
what is the DNA nucleotide made of? - CORRECT ANSWERS 5-carbon sugar (2'-
deoxyribose), phosphate, N-containing base
which bases are purines and pyrimidines, respectively? explain why they are classified this way.
- CORRECT ANSWERS purines - adenine (A) and guanine (G): have C and N forming 2
rings
pyrimidines - thymine (T) and cytosine (C): have C and N forming single ring
Which base is found only in RNA? - CORRECT ANSWERS Uracil
in his study of DNA structure, what major findings were made by Erwin Chargaff? - CORRECT
ANSWERS -amount of A relative to G differs among species (purines NOT show
stoichiometric relationships). purine will base pair with specific pyrimidine
A=T G=C
Linus Pauling built a DNA model and it failed. what was wrong with his proposed model? -
CORRECT ANSWERS negatively charged phosphate groups facing inward would repel
each other and DNA would be unstable
in their study of DNA structure, which three points did Watson and Crick focus one? -
CORRECT ANSWERS DNA size, shape (helix or parallel), bonding requirements (how
strands help together)
what type of DNA did Maurice Wilkins laboratory work with? - CORRECT ANSWERS
dehydrated DNA
What type of DNA did Rosalind Franklin's laboratory work with? - CORRECT ANSWERS
dry and wet DNA
,BIO 330 EXAM 2 QUESTIONS AND ANSWERS 2024/2025
LATEST UPDATED A COMPLETE EXAM SOLUTION WITH
CORRECT VERIFIED ANSWERS BEST RATED A+ FOR SUCCESS
based on Franklins data, what were the calculated principal dimensions of the DNA molecule? -
CORRECT ANSWERS length of full twist = 3.4nm
distance between adjacent bases = 0.34nm
diameter of DNA = 2nm
based on Franklins data, how many bases are per turn of the helix? - CORRECT
ANSWERS 3.4nm/0.34nm= 10 bases
based on Franklins data, what was the orientation of phosphate groups in the DNA molecule? -
CORRECT ANSWERS outward
based on Franklins data, how many strands were thought to be twisted into a helix? -
CORRECT ANSWERS 2, 3, or 4 parallel strands
who recognized the significance of Franklins data? - CORRECT ANSWERS Maurice
Wilkins
How many strands is DNA molecule made of and in which direction do DNA strands run? -
CORRECT ANSWERS 2 helically twisted strands running in opposite direction
(antiparallel)
which groups are located on the outside of the DNA molecule? - CORRECT ANSWERS
sugar-phosphate
where are nitrogenous bases located in the DNA molecule, and what hold the bases together? -
CORRECT ANSWERS inside, hydrogen bonds
, BIO 330 EXAM 2 QUESTIONS AND ANSWERS 2024/2025
LATEST UPDATED A COMPLETE EXAM SOLUTION WITH
CORRECT VERIFIED ANSWERS BEST RATED A+ FOR SUCCESS
which bacterial DNA polymerase was described by Aurthur Kornberg? - CORRECT
ANSWERS DNA polymerase I
explain what the origins of replication (ori) is - CORRECT ANSWERS binding sites for
proteins that initiate the replication process
which 2 elements were identified in an acidic compound that was isolated from the nucleus by
Johann Miescher? - CORRECT ANSWERS nitrogen and phosphorus
why proteins were thought to encode information that pertains to inheritable traits? -
CORRECT ANSWERS - inheritable traits are diverse, and therefore molecules that
encode these traits must be diverse
-proteins made of 20 amino acids, structurally diverse
which 2 macromolecules make the Bacteriophage structure? - CORRECT ANSWERS
protein and DNA
In a cell, which macromolecules are labeled 35S-methionine and 32P, respectively? -
CORRECT ANSWERS proteins and DNA
Describe the Hershey-Chase experiments. what conclusions were made from this study? -
CORRECT ANSWERS - radioactively labeled bacteriophages:
-radioactive 35S incorporated into bacteriophage proteins
-radioactive 32P incorporated into bacteriophage DNA
-all radioactive viruses to infect bacteria
