Concept explainers
Videos
A DNA is placed in a test tube containing fluorescently tagged
| a. | only one DNA molecule would have two fluorescent strands. |
| b. | both strands of each DNA molecule would be half-fluorescent. |
| c. | each DNA molecule would have one fluorescent strand. |
| d. | both DNA molecules would be completely fluorescent. |
Introduction:
DNA is a double-stranded nucleic acid that is responsible for the genetic inheritance. Each strand of DNA is a double helix composed of two antiparallel strands of nucleotides. The complementary nucleotides form hydrogen bonds with each other and hold DNA double helix together.
Answer to Problem 1MCQ
Correct answer:
A DNA is placed in a test tube containing fluorescently tagged nucleotides. DNA replication is induced. After replication, each DNA molecule will have one fluorescent strand. Hence, the correct answer is option c.
Explanation of Solution
Reason for correct answer:
Option c. is given as “each DNA molecule would have one fluorescent strand.”
DNA is the genetic molecule and exhibits a double helix structure. According to Watson and Crick, DNA replication is semi-conservative, which suggests that during replication, one strand of DNA will be original and another will be a new strand. In the presence of fluorescent nucleotides after DNA replication, only the new strand will be fluorescent. Hence, option c. is correct.
Reason for incorrect answer:
Option a. is given as, “only one DNA molecule would have two fluorescent strands.”
During DNA replication one of the DNA strands acts as a template and a new strand is formed over it. Therefore, one DNA molecule will always be nonfluorescent if only one replication cycle happens. Hence, option a. is incorrect.
Option b. is given as, “both strands of each DNA molecule would be half-fluorescent.”
During replication, the new strand is formed based on the original strand. Hence one full strand acting as a template will be nonfluorescent, and the new strands will be fluorescent. Hence, option b. is incorrect.
Option d. is given as, “both DNA molecules would be completely fluorescent.”
Both DNA molecules will be completely fluorescent if multiple replication cycles happen. Still the original DNA strands will be nonfluorescent and will have new fluorescent strands. Hence, option d. is incorrect.
Hence, the options a., b., and d. are incorrect.
DNA replication is semiconservative, which means that during replication the original DNA strand will act as a template and new strand is formed over it. Thus, the correct option is c.
Want to see more full solutions like this?
Chapter 8 Solutions
BIOLOGY:THE ESSENTIALS (LL) W/CONNECT
- Nucleotide excision repair A. recognizes and repairs thymine dimers and other damaged bases in DNA B. corrects errors in nucleotide excision C. recognizes and removes mismatched bases after DNA synthesis is completed D. removes nucleotides that are incorrectly incorporated during DNA synthesisarrow_forwardWhat is DNA polymerase? A. An enzyme that corrects mutations that arise during the replication of DNA B. An enzyme that seals any gaps that remain between bases of replicating strands of DNA C. Short, single strand of DNA that base-pairs with a specific DNA sequence D. An enzyme that carries out DNA replicationarrow_forwardDuring DNA replication, the helicase enzyme binds to DNA and Select one: a. prevents the DNA strands from rewinding back into the helical shape b. cuts the double stranded DNA into single strands c. provides the starting point where new nucleotides can be added d. adds new nucleotides to the template strandarrow_forward
- What are major functions that DNA polymerase performs? A. unzips the DNA strand and makes the new nucleotides B. proof reads the new DNA strands for errors and corrects them C. bonds the nucleotides together forming the new DNA strand D. A, B, and C E. A and B F. B and C G. A and Carrow_forwardA person cannot see a single cotton thread 100 feet away, but if you wound thousands of threads together into a rope, it would be visible much further away. Is this statement analogous to our DNA extraction? Explain.arrow_forwardReplication of DNA produces two daughter DNA molecules in which a. one daughter molecule contains both parent strands and one daughter molecule contains both newly synthesized b. each daughter molecule contains one percent strand and one newly synthesized strand c. each daughter molecule contains two newly synthesized strands d. each daughter molecule contains both parent strandsarrow_forward
- a. Write the reaction that proves that UV attacks DNA.b. What is a base stacking interaction? How does it help DNA?c. Explain the Sanger method in detail.arrow_forwardDNA replication is said to be semiconservative because a. one of the new molecules conserves both of the original DNA strands. b. the new DNA molecule contains two new DNA strands. c. both of the new molecules contain one new strand and one old strand. d. DNA polymerase conserves both of the old strands.arrow_forwardWhen two adjacent bases in the same strand of DNA dimerize (form a covalent bond between them), what happens to the DNA? a. the original strand of DNA now contains a new DNA sequence b. the original strand of DNA is prevented from opening during replication, so this section of DNA will not be replicated c. the original strand of DNA is methylated, which causes the bases to mismatch d. the original strand of DNA is kinked, which prevents DNA polymerase from working properly e. the original strand of DNA is unaffected, so no additional mutations arisearrow_forward
- Refer to Figure 2 and compare this with the DNA model in Figure 1. a. In what ways are they similar? b. In what ways are they different? c. What is the biological significance of such differences? Why is the DNA referred to as the genetic material?arrow_forwarduse the terms RNA primase dna polymerase helicase leading strand and lagging strand to briefly describe how DNA replicatesarrow_forwardCompare the two new strands of DNA. Are they the same or different? Why?arrow_forward
Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSON
Biology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStax
Anatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & Company
Laboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.
Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education