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Bio 340 Exam 3 Questions And Verified Detailed Answers Latest Update
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Bio 340 Exam 3 Questions And Verified DetailedAnswers Latest Update
What is the difference between purines and pyrimidines?
The two complementary partners that make up a DNA base pair are always composed of
one purine and one pyrimidine, never two purines or two pyrimidines. The purines are
the nucleotides with the double-ring structures. The pyrimidines are the nucleotides
with the single-ring structures. An easy way to remember that is the longer names
(pyrimidines) have the smaller rings and the shorter name (purines) have the bigger
rings.
If any sample of DNA is analyzed and the amounts of the bases measured, it is found that
.
a) the amount of A + the amount of C = the amount of G + the amount of U.
b) the amount of A + the amount of T = the amount of G + the amount of C.
c) the number of A + the number of G = the number of T + the number of C.
d) the number of A = the number of G; the number of T = the number of C.
e) None of the above.
c) the number of A + the number of G = the number of T + the number of C.
For every A there's a T; for every G there's a C.
Which statement describes a real difference between DNA and RNA?
a) DNA can form a double helix; RNA cannot.
b) DNA is very longer than RNA.
c) DNA contains more types of bases than RNA.
,d) Both (A) and (D).
e) (A), (B), and (C).
b) DNA is very longer than RNA.
RNA is synthesized by transcribing small segments of DNA.
What keeps the strands of the DNA double helix together?
Hydrogen bonds between purines and pyrimidines.
If you were to take a DNA sample extracted from a eukaryotic cell and:
a) the number of purines would equal the number of pyrimidines.
b) the number of adenines would equal the number of uracils.
c) the number of guanines would equal the number of cytosines.
d) Both (A) and (C).
e) (A), (B), and (C).
d) Both (A) and (C).
These are consequences of the base-pairing rules, which are fundamental to life.
Nucleotide
A nucleotide is a nucleic acid monomer consisting of a nitrogen base, a pentose sugar,
and a phosphate group. Nucleotides joined by covalent bonds called phosphodiester
linkages form nucleic acid molecules.
The flow of genetic information in a cell goes from ___.
DNA to RNA to protein
,Explanation: The information in DNA is transcribed into RNA and then translated into
protein.
When nucleotides polymerize to form a nucleic acid ____.
a) covalent bonds form between the bases of two nucleotides
b) a covalent bond forms between the sugar of one nucleotide and the phosphate of a
second
c) a hydrogen bond forms between the sugar of one nucleotide and the phosphate of a
second
d) hydrogen bonds form between the bases of two nucleotides
b) a covalent bond joins the sugar of one nucleotide with the phosphate of a second
We have an expert solution to this problem!
In a nucleotide the nitrogenous base is bonded to which carbon of the sugar and the
phosphate group is attached to which carbon of the sugar?
a) 1'. 3'
b) 2'. 1'
c) 1'. 5'
d) 1'. 2'
e) 2'. 3'
c) 1'. 5'
The nitrogenous base is bonded to the sugar's 1' carbon and the phosphate group is
bonded to the sugar's 5' carbon.
We have an expert-written solution to this problem!
, Nucleic acids are built in the _____ direction.
5' to 3'
New nucleotides are incorporated into the 3' end of a growing polynucleotide.
Who are those who proved that DNA is the genetic material of the T2 phage?
a) Franklin
b) Hershey and Chase
c) Meselson and Stahl
d) Watson and Crick
e) Darwin and Wallace
b) Hershey and Chase
Hershey and Chase did a series of classic experiments demonstrating that DNA is the
genetic material of the T2 phage.
We have an expert-written solution to this problem!
The radioactive isotope 32P labels the T2 phage's ____.
a) tail
b) DNA
c) head
d) protein coat
e) base plate
b) DNA
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