Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Textbook Question
Chapter 21, Problem 4TY
Why is Taq polymerase used in PCR rather than other DNA polymerases?
- a. Taq polymerase is a synthetic enzyme that produces DNA strands at a faster rate than natural polymerases.
- b. Taq polymerase is a heat-stable form of DNA polymerase that can function after exposure to the high temperatures necessary for PCR.
- c. Taq polymerase is easier to isolate than other DNA polymerases.
- d. Taq polymerase is the DNA polymerase commonly produced by most eukaryotic cells.
- e. All of the above are correct.
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Why is it important to use a hyperthermophilic DNA polymerase in PCR?
a) Because only hyperthermophiles have DNA polymerases.
b) Because hyperthermophilic DNA polymerase is able to resist the saline reaction conditions.
c) Because hyperthermophilic DNA polymerase is faster than other polymerases.
d) Because hyperthermophilic DNA polymerase is able to resist denaturation at 95℃.
Would it be possible to use human polymerase for the PCR reaction?
a.
No, because human polymerase does not have the ability to withstand the high temperatures required for the PCR reaction to occur.
b.
No, because human polymerase cannot be extracted from cells to use in a lab setting.
c.
Yes, because we are using human DNA as the template DNA.
d.
Yes, because human polymerase can add bases to a template strand without a primer.
(A) After three cycles of PCR, how many DNA molecules are present that correspond precisely to the desired amplification product?
(B) What about after 5 cycles. Assume that we started with one molecule in each case, and that the reaction is perfectly efficient.
Chapter 21 Solutions
Biology
Ch. 21.1 - Prob. 1CSCh. 21.1 - Prob. 1CCCh. 21.1 - Prob. 2CCCh. 21.1 - Prob. 3CCCh. 21.2 - Prob. 1CCCh. 21.2 - Prob. 2CCCh. 21.2 - Prob. 3CCCh. 21.3 - Prob. 1EQCh. 21.3 - Prob. 2EQCh. 21.3 - Prob. 3EQ
Ch. 21.4 - Prob. 1CCCh. 21.4 - Prob. 1CSCh. 21.5 - Prob. 1CSCh. 21.5 - Repetitive Sequences and Transposable Elements...Ch. 21 - Prob. 1TYCh. 21 - DNA ligase is needed in a cloning experiment a. to...Ch. 21 - Prob. 3TYCh. 21 - Why is Taq polymerase used in PCR rather than...Ch. 21 - Lets suppose you want to clone a gene that has...Ch. 21 - In the CRISPR-Cas technology for editing genes,...Ch. 21 - Prob. 7TYCh. 21 - The enzyme that helps short segments of DNA move...Ch. 21 - Prob. 9TYCh. 21 - Which of the following was not a goal of the Human...Ch. 21 - Prob. 1CQCh. 21 - Briefly describe whether or not each of the...Ch. 21 - Prob. 3CQCh. 21 - Identify and discuss three important advances that...Ch. 21 - Prob. 2COQ
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- Compare and contrast polymerase chain reaction (PCR) to DNA replication in a cell.arrow_forwardChoose the one answer that fits best. Which statement regarding PCR is NOT correct (videos)? a. PCR requires a copy of RNA that serves as a template b. Taq polymerase adds nucleotides to the primers and creates a complementary strand of DNA c. Annealing requires cooler temperatures than denaturation d. Repeated cycles of denaturation, annealing and extending DNA strands creates many identical copies of DNA e. PCR is a quick way of using minute quantities of DNA to create millions of copiesarrow_forwardPolymerase Chain Reaction, or PCR, can Group of answer choices A. target a specific region of DNA and cut it out of the rest of the genetic material for further analysis. B. copy the number of copies of a selected region of DNA linearly. C. increase the number of copies of a selected region of DNA exponentially. D. copy the entire genome at least a dozen times.arrow_forward
- What is DNA polymerase? a.An enzyme that carries out DNA replication b.Short, single strand of DNA that base-pairs with a specific DNA sequence c.An enzyme that corrects mutations that arise during the replication of DNA d.An enzyme that seals any gaps that remain between bases of replicating strands of DNAarrow_forwardDNA fragments that are 500 bp, 1000 bp, and 2000 bp in length are separated by gel electrophoresis. Which fragment will migrate farthest in the gel? a. The 2000-bp fragment b. The 1000-bp fragment c. The 500-bp fragment d. All will migrate equal distances.arrow_forwardChoose the combination of answers that most accurately completes the statement. Why must the lagging strand of DNA be replicated in short pieces? a. because of limited space b. otherwise, the helix will become distorted c. the DNA polymerase can synthesize in only one direction d. to make proofreading of code easierarrow_forward
- In the dideoxy-sequencing reaction, what terminates DNA synthesis at a particular base? a. The absence of a base on the ddNTP halts the DNA polymerase. b. The ddNTP causes a break in the sugar–phosphate backbone. c. DNA polymerase will not incorporate a ddNTP into the growing DNA strand. d. The absence of a 3′-OH group on the ddNTP prevents the addition of another nucleotide.arrow_forwarda. Describe the ingredients of a PCR reaction. b. List the different temperatures used in each cycle and tell why each is used.arrow_forwarda. Explain why the PCR is unlikely to amplify contaminatingbacterial DNA in a sample of human DNA. b. Explain how PCR could be used to pick a gene out of a complexgenome and amplify it.arrow_forward
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