Biology: Life on Earth with Physiology (11th Edition)
11th Edition
ISBN: 9780133923001
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Chapter 19.1, Problem 1CSC
Origin of a Killer
Analysis of
DNA analysis has also shown that HIV is a member of a group called the lentiviruses. How do taxa get their names? can the names tell us anything about the evolutionary histories of taxa?
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1. There is evidence to dispove Crick's (1958) Central Dogma of Molecular Biology. one such evidence is how the coronavirus replicates genetic information. Explain fully how this process disproves Crick's Central Dogma
2. Describe how subgenomic RNAs are unique physically compared to regular RNA strands. Explain fully the benfit of this adaptation for viruses.
3.It is speculated that coronaviruses appeared on Earth before cells. Considering tge genetic material of coroniviruses and cells justidy fully this answer
why testing known inhibitors such as the HIV-1 protease inhibitors nelfinavir and atazanavir used in this experiment, is beneficial for creation of new antiviral drugs. Is it due to conserved viral DNA or something else entirely?
nature.com/articles/s41467-021-20900-6
Viruses are made up of the same biomolecules as cellular organisms (DNA, RNA, proteins, lipids, etc.), which are synthesized through enzymatic dehydration reactions from building blocks and disassembled by enzymatic hydrolysis. They infect cells and replicate themselves using resources from the host cells. Scientists discovered a previously unknown strain of virus in the tropical Pacific Ocean and it can infect higher-order eukaryotes. Initial analysis revealed that the virus is mainly composed of nucleic acids, proteins, and lipids. Chemical analysis after complete hydrolysis revealed the following building blocks (by weight):
Chemical components
Nucleosides
Amino acids
Lipids, phosphates, and carbohydrates
Percentage by weight
20
30
50
Analysis of percentages of nucleosides yielded the following results (by molar ratio):
Nucleosides
A
G
T
C
U
Percentage by mole
19
29
19
29
4
Which of the following events mostly involves hydrolysis reaction after the virus infects…
Chapter 19 Solutions
Biology: Life on Earth with Physiology (11th Edition)
Ch. 19.1 - Origin of a Killer Analysis of nucleotide...Ch. 19.1 - explain why scientific names are necessary?Ch. 19.1 - Analysis of human chromosome 2 revealed that it...Ch. 19.1 - describe the type of similarities that...Ch. 19.1 - Prob. 3CYLCh. 19.2 - Prob. 1CYLCh. 19.2 - Prob. 1TCCh. 19.2 - explain how scientists discovered that prokaryotes...Ch. 19.3 - Prob. 1CYLCh. 19.3 - Prob. 1HYEW
Ch. 19.3 - Prob. 2CYLCh. 19.4 - Prob. 1CSRCh. 19 - Applying the Concepts The pressures created by...Ch. 19 - Prob. 1FIBCh. 19 - Prob. 1MCCh. 19 - What contributions did Linnaeus and Darwin make to...Ch. 19 - Applying the Concepts 2. During major floods, only...Ch. 19 - Prob. 2FIBCh. 19 - To be informative for reconstructing the phylogeny...Ch. 19 - Prob. 2RQCh. 19 - Consider the following list of groups: (1)...Ch. 19 - In Linnaean classification, the eight major...Ch. 19 - Prob. 3MCCh. 19 - What techniques might you use to determine whether...Ch. 19 - Systematists determine the evolutionary...Ch. 19 - In modern systematics, classifications are...Ch. 19 - Only a small fraction of the total number of...Ch. 19 - Prob. 5FIBCh. 19 - Which of the following includes all the domains...Ch. 19 - In England, daddy longlegs refers to a long-legged...Ch. 19 - The number of named species is about ________, but...Ch. 19 - Why are species designations of asexually...
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- The complete coronavirus genome sequence from the first known patient infected with SARS-CoV-2 was published on January 10th 2020, just a short time after the patient had been hospitalized in China with respiratory symptoms. They did this so quickly using nanopore sequencing. Scientists compared the genome sequence from the new coronavirus (SARS-CoV-2) with the genome sequences from several other coronaviruses and they did identify a sequence unique to the SARS-CoV-2 strain. This unique sequence was in the N gene of the viral genome. What protein is made from the N gene of the virus?arrow_forwardSome retroviruses that have a wide host range have been developed for use in treatment of diseases or syndromes. These viruses do not result in a productive infection because they lack critical genes for viral replication, but they do carry DNA sequences that allow them to be packaged into infectious particles. Once in the host cell the viral DNA is released and integrates into the cell's genome. The advantage to this strategy is that the delivery of the DNA is very efficient. What is one possible problem of using a virus that can integrate into the human nuclear genome? Multiple Choice The virus carries genes that will interfere with host cell activities. The viral DNA sequences could still cause a disease. Since the viral DNA sequences no longer contain essential genes for viral replication the host cell may not be able to replicate either. The integration could disrupt an essential gene or genes.arrow_forwardA virus that has which type of genome must carry replicase within the viral particle? (choose all that apply) ds DNA ss (+) DNA ss (–) DNA ss (+) RNA ss (–) RNA Which viral type has a genome that can be directly translated? (choose all that apply) ds DNA ss (+) DNA ss (–) DNA ss (+) RNA ss (–) RNAarrow_forward
- Assume you isolate a single stranded (+) RNA virus. When you examine the proteins in the virus, you find that it does NOT contain replicase enzymes within its capsid. Which of the following is true? This virus must have a gene that encodes replicase. This virus will not be able to enter a host cell. Its genome cannot be translated (the process of translation) by the host cell ribosomes. A DNA copy of the viral genome has to be made before viral genes are expressed. This virus must lack surface antigens.arrow_forwardAs a general rule, viruses are not considered to be alive based on several reasons. One such reason is that some viruses use RNA as their genetic material instead of DNA. Which of the five biological themes does this violate? Briefly explain why.arrow_forwardThe table below shows the properties of the genomes of three different viruses. The data were obtained as follows: Nuclease sensitivity was measured by the ability of deoxyribonuclease (DNase) or ribonuclease (RNase) to destroy the genome (a “+" means sensitivity). The ability of the genome to act as mRNA was tested by incubating it in a cell-free system. If amino acids were incorporated into protein, the data are shown as a Finally, the virus particles were tested for the presence of a virion polymerase. If an enzyme was present, the data show whether it could polymerize deoxynucleotide triphosphates (DNTPS) or nucleoside triphosphates (NTPS). "+. Genome Properties Nuclease Virion Can Genome Sensitivity? Polymerase? Be an mRNA? Virus DNase RNase With With DNTPS NTPS #1 - - #2 - - #3 For each virus, indicate the strategy of the genome, using the Baltimore classification. What is the nature of the product of the virion polymerase when present? + + + + + +arrow_forward
- 3) It is now 2085 and the world is experiencing another pandemic viral infection. The scientist that discovers the virus, purifies out the genetic information and learns that it has a sequence that is: 26% Cytosine 21% Adenine 28% Uracil and 25% Guanine What sort of genetic information does this new virus have? DNA or RNA? Single or Double Stranded? Explain how you know!arrow_forwardWhich of the following statements regarding viral genomes is FALSE? Question options: viral genomes are always comprised of RNA viral genomes are smaller than the genomes of cellular life viral genomes can be either single-stranded or double-stranded viruses can have as few as three genes viral genomes do not encode ribosomal RNAs all these statements are TRUE The ______________ of a virus is a phospholipid bilayer with embedded proteins and glycoproteins Question options: capsid chromosome envelope nucleocapsid spike receptorarrow_forwardExplain the reason why segmentation of the genome provides a strong evolutionary advantage for negative strand viruses.arrow_forward
- This virus does not conform to the central dogma of molecular biology. Explain the central dogma and how the virus behaves differently. How should the patient to treated? Can the treatments cure the disease?arrow_forwardof Poxviruses are unusual among DNA viruses because their replication cycles takes place entirely in the host cell cytoplasm. How can these viruses carry out genome replication and transcription of viral genes without going to the nucleus? Briefly explain. Edit View Insert Format Tools Table 20px v Paragraph v へ へ ヘ .V8:11 EEO 1I0 & %24 9 6 n d k 4arrow_forwardWhich viruses have potential for the highest mutation rates, DNA or RNA viruses? Explain O DNA viruses as DNA polymerases do not proofread thus make many mistakes/mutations when viral RNA is copied DNA viruses as DNA polymerases do not proofread thus make many mistakes/mutations when viral DNA is copied RNA viruses as DNA polymerases do not proofread thus make many mistakes/mutations when viral DNA is copied RNA viruses as RNA polymerases do not proofread thus make many mistakes/mutations when viral RNA is copied and DNA polymerases do proof readarrow_forward
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What Is A Virus ? ; Author: Peekaboo Kidz;https://www.youtube.com/watch?v=YS7vsBgWszI;License: Standard YouTube License, CC-BY