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Cell Bio Exam 4

44 Questions  I  By Jaffryf
Cell Quizzes & Trivia
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1.  _________ bonds are responsible for the polymer backbone of DNA, while _____ bonds primarely account for complementary base pairing in DNA.
A.
B.
C.
D.
E.
2.  The precentage of GC in a DNA sequence affects the Tm of the sequence because
A.
B.
C.
D.
E.
3.  Which one of the following proteins and enzymes do not function at the origin of replication in E. coli?
A.
B.
C.
D.
4.  Which enzyme in E. Coli is responsible for reliving the tension ahead of the fork that results when the DNA is unwould to form the replication bubble or eye?
A.
B.
C.
D.
5.  Which RNA polymerase transcribes protein-coding genes into mRNA in eukaryotes?
A.
B.
C.
D.
6.  DNA polymerases always synthesize new DNA by adding nucleotides on to the 5' phosphate.
A.
B.
7.  Which subunit of RNA polymerase establishes template binding to a promoter in prokaryotes?
A.
B.
C.
D.
8.  If two DNA strands of identical length were analyzed, which of the following statements would be true of their T(..?) or melting temperature?
A.
B.
C.
D.
9.  Which DNA polymerase is mainly responsible for genome replication in E. coli?
A.
B.
C.
D.
10.  Introns are known to contain temrination codons (Uaa, UGA, or UAG) yet these codons do not interrupt the coding of a particular protein. why?
A.
B.
C.
D.
E.
11.  An intron is a section of
A.
B.
C.
D.
E.
12.  What are the two main types of post-transcriptional modications that take place int he mRNA of eukaryotes?
A.
B.
C.
D.
13.  Which enzyme makes DNA from an RNA template?
A.
B.
C.
D.
14.  Meselson and Stahl alowed baclene raise in 13N medium to replicate in 14N medium. at the end of two rounds of DNA replication, they observed ___ band(s) in their centrifugation tubes which was/were composed of _____..
A.
B.
C.
D.
E.
15.  If 15% of the nitrogenous bases is a sample of DNA from a particular organism is thymine, what percentage should be cytosine?
A.
B.
C.
D.
E.
16.  Which of the following clusters of terms accurately describes DNA as it is generaly viewed to exist in prokaryotes and eukaryotes?
A.
B.
C.
D.
17.  In addition to highly repetitive and unique DNA sequences, a third category of DNA sequences exists. What is it called and what types of elements are involved?
A.
B.
C.
D.
E.
18.  Why is an RNA primer considered essential for DNA synthesis by DNA polymerase III?
A.
B.
C.
D.
19.  Which of the following options has the events of prokaryotic transcription in order
A.
B.
C.
D.
E.
20.  Which of the following statements best describes Okazaku fragments?
A.
B.
C.
D.
21.  Which one of the following statements is not true for (...?) DNA polymerases?
A.
B.
C.
D.
E.
22.  Which of the following statements best describes the structure of a DNA molecule?
A.
B.
C.
D.
E.
23.  Ich of the following is not neccessary for RNA polymerase to recongize the promoter of a bacternal game?
A.
B.
C.
D.
24.  If Avery, MacLead, and McCarty had determined that the transforming molecule was a protein, what experimental results would not have been observed?
A.
B.
C.
D.
25.  Which of the following can account for multiple proteins from a primary transcript?
A.
B.
C.
D.
26.  The bindin g of TBP to a polyermase II promoter.
A.
B.
C.
D.
E.
27.  Transcribed regions present in the mature mRNA would arise from a ______ while transcribed reigions NOT present in the mature mRNA would arise from a _____
A.
B.
C.
D.
E.
28.  Bacteria grown in a medium containing 15NH4Cl for a number of generations so that all of the DNA is made up of fully "heavy" DNA. The bacteria are moved to a new medium and grown in 14NH4Cl so that all new DNA will be "light". if replication were conservative, what would the DNA look like after one generation time
A.
B.
C.
D.
E.
29.  What would the result be if a specific sigma subunit were mulated?
A.
B.
C.
D.
30.  The end repcliation problem involves
A.
B.
C.
D.
E.
31.  Telomerase is an enzyme involved in the replication of the ends of eukaryotic chromosomes
A.
B.
32.  The RNA polymerase enzyme is said to be ____ because it stays attached to DNA over long stretches of template to make prodigiously long mRNAs while it remains loose enough to move freely along the template
A.
B.
C.
D.
E.
33.  A new antibiotic is able to bind the rho (p) factor associated with some transcription processes, as a result this antibiotic would affect
A.
B.
C.
D.
E.
34.  Attachment of the sigma-factor
A.
B.
C.
D.
E.
35.  Strand initiation in DNA replication is accomplished when an enzyme lays down a primer. Of what molecule is that primer composed?
A.
B.
C.
D.
E.
36.  Those portions of DNA preceding the initiation site toward the 3 end of the template are said to be ___ that site
A.
B.
C.
D.
37.  Why has the One Gene- One Polypeptide hypothesis had to be modified?
A.
B.
C.
D.
38.  Both plants and animals produce hundreds of tiny RNAs that are relatively small in size (roughly 20-25 nucleotides in length). fFirst discovered in nematodes, they are synthesized only at certain times during development or in certain tissues of a plant or animal, and are presumed to play a regulatory role. They are called ____
A.
B.
C.
D.
39.  What is the only general transcription factor known to have enzymatic activity?
A.
B.
C.
D.
E.
40.  It is important that the two strands of DNA near the front end of a gene are able to seperate easily so that the gene can be expressed at the appropriate time. what should base composition in this part of the gene therefore be and why?
A.
B.
C.
D.
41.  What interactions are responsible for holding the introgenous bases together stracked one on top of another in the center of a RNA molecule and contribute to the stability of the whole DNA molecule?
A.
B.
C.
D.
E.
42.  What type of DNA sequences range from about 10 to 100 base pairs and are found to clusters containing as many as 3000 repeats? These sequences tend to be unstable with the number of copies of ap articular sequence often increasing or decreasing from one generation to the next
A.
B.
C.
D.
E.
43.  DNA replicating enzymes are known to have trouble copying genome regions that contain which class of DNA sequences? these stretches of DNA change in length trhough the generations and due to their variable lengths within the population, they have been used to analyze relationships between different ethnic human populations
A.
B.
C.
D.
E.
44.  Which of the following events directly triggers the initation of replication at an ARS?
A.
B.
C.
D.
E.
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