Campbell Biology: Custom Edition
18th Edition
ISBN: 9781323717271
Author: Urry, Cain, Wasserman, Minorsky, Reece
Publisher: PEARSON C
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Chapter 19, Problem 4TYU
Summary Introduction
Introduction: Bacteria are single-celled prokaryotic microorganisms. A bacteriophage is also called as bacterial virus that is formed when a virus infects a bacterium. T2 and T4 are enterobacteria phages that infect and kill E. coli. They are also known as T-even phages because they are double stranded. T-even phages are commonly used as model organisms for various genetic studies. The experiments performed by Hershey and Chase using bacteriophages already proved that DNA is the genetic material of inheritance.
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During the lytic replication cycle of the bacteriophage T4, the phage _________ remains outside the cell while the phage ________ enters the cell.
A) capsid protein… tail fibers
B) DNA… protein
C) envelope… DNA
D) enzymes… ribosome
E) protein… genetic material
F) RNA… capsid protein
Why is a webbed plate capable of producing a higher lysate titer (pfu/mL) than a cleared plate?
a.) A webbed plate has plaques that have gone through more rounds of replication because the number of host cells did not limit phage replication, creating exponentially more phage particles
b.) A webbed plate has no more host available for replication, meaning the plate is full of exponentially higher amounts of phage
c.) A cleared plate has less bacteria than a webbed plate, so there are more plaques present
d.) A cleared plate contains more phage than a webbed plate because it started with a more concentrated phage sample
The induced clones are developed by ________ into the host cell.a) Nuclear transfer b) Gene transfer c) Cell transfer d) Antigen transfer
Chapter 19 Solutions
Campbell Biology: Custom Edition
Ch. 19.1 - Prob. 1CCCh. 19.1 - MAKE CONNECTIONS Bacteriophages were used to...Ch. 19.2 - Compare the effect on the host cell of a lytic...Ch. 19.2 - MAKE CONNECTIONS Compare the CRISPR-Cas system to...Ch. 19.2 - Prob. 3CCCh. 19.2 - Why is HIV called a retrovirus?Ch. 19.2 - Prob. 5CCCh. 19.3 - Describe two ways in which a preexisting virus can...Ch. 19.3 - Contrast horizontal and vertical transmission of...Ch. 19.3 - WHAT IF? TMV has been isolated from virtually all...
Ch. 19 - Are viruses generally considered living or...Ch. 19 - Prob. 19.2CRCh. 19 - Prob. 19.3CRCh. 19 - Which of the following characteristics,...Ch. 19 - Emerging viruses arise by (A) mutation of existing...Ch. 19 - Prob. 3TYUCh. 19 - Prob. 4TYUCh. 19 - Prob. 5TYUCh. 19 - DRAW IT Redraw Figure 19.8 to show the replicative...Ch. 19 - EVOLUTION CONNECTION The successof some viruses...Ch. 19 - SCIENTIFIC INQUIRY When bacteria infect an animal,...Ch. 19 - WRITE ABOUT A THEME: ORGANIZATION While viruses...Ch. 19 - Prob. 10TYU
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- Synthesis of new bacteriophages in a bacterial host involves the use of a.) Host cell encoded proteins only b.)Virally encoded proteins only c.) Both host and virally encoded proteinsarrow_forwardInfluenza vaccines must be changed yearly because the amino acid sequence of the viral proteins change gradually over time. Based on this information, which is the most logical conclusion? The influenza virusa) is enveloped. b) is non-enveloped.c) has a DNA genome. d) has an RNA genome.e) causes a persistent infection.arrow_forwardWhich of the statements about bacteriophage is FALSE: a) specialized transduction is a low frequency event b) may accidently package host DNA into a phage particle c) may perform specialized transduction d) only have a lytic life cyclearrow_forward
- Why must a new flu vaccine be manufactured annually? A.) The flu causes mutations in the host cell DNA. B.) Sexual reproduction between flu viruses creates new strains. C.) The genes for the proteins on the exterior of the flu virus mutate frequently. D.) The flu virus develops methods to break down the vaccine.arrow_forwardWhich of the following are activities that a virus particle (a virion) cannot accomplish by itself? Select all that apply. a) Extract energy from food molecules b) Synthesis of capsid proteins c) Generate ATP d) Binding to a host cell e) Replication of the viral genomearrow_forwardThe mechanism of specialized transduction relies on the improper excision of a bacteriophage genome that is integrated in the host cell chromosom A) O True B) O Falsearrow_forward
- Prions “replicate” by _____. A) replicating their RNA genome within the cytoplasm B) converting normally-folded versions of the protein into misfolded version C) inserting their genome into the host cells chromosome where it will continue to divide indefinitely D) using reverse transcriptase to copy their RNA genome into a complementary copy of DNAarrow_forwardA particular animal virus requires the use of DNA polymerase from its host, since it does not possess its own DNA polymerase enzyme. Which of the following assumptions in A-D would likely be correct regarding this virus? A) O This virus could not be a retrovirus type. B) OIt could be a (-) ss RNA virus. C) O It could be a (+) ss RNA virus. D) O The vVirus life cycle very likely includes going to the host cell nucleus. E) O All ofA-D are correct assumptions.arrow_forwardWhich of the following is inconsistent with the central dogma? a) An RNA molecule that can self-replicate b) A chromosome that is duplicated before cell division c) A protein that converts its own amino acid sequence into a DNA sequence d) A retrovirus (e.g. HIV) that transcribes its RNA genome into DNA inside its host e) A gene being translated into a proteinarrow_forward
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