CUSTOM BIOLOGY
19th Edition
ISBN: 9781323945490
Author: Urry
Publisher: Pearson Custom Publishing
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Textbook Question
Chapter 16, Problem 2TYU
What is the basis for tlie difference in how the leading and lagging strands of DNA molecules are synthesized?
(A) The origins of replication occur only at the 5' end.
(B) Helicases and single-strand binding proteins work at the 5' end.
(C) DNA|Polymerase can join new
(D) DNA ligase works only in the 3' →5' direction.
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The following diagram represents a DNA molecule that is undergoing replication. Draw in the strands of newly synthesized DNA and identify (a) the polarity of the newly synthesized strands, (b) the leading and lagging strands, (c) Okazaki fragments, and (d) RNA primers.
(a) What will be the problem during DNA replication if the enzyme primase becomes non-functional?
(b) In which step of the central dogma is the genetic information of DNA copied into new DNA strands?
(c) Which of the following codons is a start codon: GCU, AUG or UGA?
(a) Eukaryotic DNA replication is more complex than prokaryotic replication. Give one reason why this should be so.
(b) Why might eukaryotic cells need more kinds of DNA polymerases than bacteria?
Chapter 16 Solutions
CUSTOM BIOLOGY
Ch. 16.1 - Given a polynucleotide sequence such as GAATTC,...Ch. 16.1 - VISUAL SKILLS Griffith was trying to develop a...Ch. 16.2 - What role does complementary base pairing play in...Ch. 16.2 - Identify two major functions of DNA pol III in DNA...Ch. 16.2 - Prob. 3CCCh. 16.2 - Prob. 4CCCh. 16.3 - Describe the structure of a nucleosome, the basic...Ch. 16.3 - Prob. 2CCCh. 16.3 - MAKE CONNECTIONS Interphase chromosomes appear to...Ch. 16 - What does it mean wheti we say that the two DNA...
Ch. 16 - DRAW IT Redraw the Punnett Square on The right...Ch. 16 - Prob. 16.3CRCh. 16 - In his work with pneumonia-causing bacteria and...Ch. 16 - What is the basis for tlie difference in how the...Ch. 16 - In analyzing the number of different bases in a...Ch. 16 - The elongation of the leading Strand during DNA...Ch. 16 - In a nucleosome, the DNA is wrapped around (A)...Ch. 16 - E. coli cells grown on, 15N medium are transferred...Ch. 16 - A biochemist isolates, purifies, and combines in a...Ch. 16 - The spontaneous loss of amino groups from adenine...Ch. 16 - MAKE CONNECTIONS Although the proteins that cause...Ch. 16 - EVOLUTION CONNECTION Some bacteria may be able to...Ch. 16 - SCIENTIFIC INQUIRY DRAW IT Model building can be...Ch. 16 - Prob. 12TYUCh. 16 - Prob. 13TYU
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- Enzymes that break down DNA catalyze the hydrolysis of thecovalent bonds that join nucleotides together. What wouldhappen to DNA molecules treated with these enzymes?(A) The two strands of the double helix would separate.(B) The phosphodiester linkages of the polynucleotidebackbone would be broken.(C) The pyrimidines would be separated from the deoxyribosesugars.(D) All bases would be separated from the deoxyribose sugars.arrow_forwardOxidative deamination of adenine produces hypoxanthine (the base of inosine), which can base pair with cytosine. (a) If no repair takes place, describe the makeup of the DNA in the two daughter cells following cell division. (b) Describe the makeup of the DNA in the four daughter cells following a second round of cell division.arrow_forward(5) What are these short DNA fragments usually called? (6) Which enzyme probably functions here to couple these two newly synthesized fragments of DNA? (7) Is this strand the leading or lagging strand?arrow_forward
- The statement “DNA replicates by a semiconservative mechanism” means that (a) only one DNA strand is copied (b) first one DNA strand is copied and then the other strand is copied (c) the two strands of a double helix have identical base sequences (d) some portions of a single DNA strand are old and other portions are newly synthesized (e) each double helix consists of one old and one newly synthesized strandarrow_forwardThe elongation of the leading strand during DNA synthesis(A) progresses away from the replication fork.(B) occurs in the 3′ S 5′ direction.(C) produces Okazaki fragments.(D) depends on the action of DNA polymerasearrow_forwardDraw a molecule of DNA undergoing theta replication. On your drawing, identify (a) origin of replication, (b) polarity (5′ and 3′ ends) of all template strands and newly synthesized strands, (c) leading and lagging strands, (d) Okazaki fragments, and (e) locations of primers.arrow_forward
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- Draw a molecule of DNA undergoing eukaryotic linear replication. On your drawing, identify (a) origin of replication, (b) polarity (5′ and 3′ ends) of all template and newly synthesized strands, (c) leading and lagging strands, (d) Okazaki fragments, and (e) locations of primers.arrow_forwardSeveral temperature-sensitive mutant strains of E. coli displaythe following characteristics. Predict what enzyme or functionis being affected by each mutation.(a) Newly synthesized DNA contains many mismatchedbase pairs.(b) Okazaki fragments accumulate, and DNA synthesis is nevercompleted.(c) No initiation occurs.(d) Synthesis is very slow.(e) Supercoiled strands remain after replication, which isnever completed.arrow_forwardThe spontaneous loss of amino groups from adenine inDNA results in hypoxanthine, an uncommon base, oppositethymine. What combination of proteins could repair suchdamage?(A) nuclease, DNA polymerase, DNA ligase(B) telomerase, primase, DNA polymerase(C) telomerase, helicase, single-strand bindingprotein(D) DNA ligase, replication fork proteins, adenylylcyclasearrow_forward
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