Concept explainers
The genome of a virus consists of (a) DNA (b) RNA (c) prions (d) DNA and RNA (e) DNA or RNA
Introduction: An organism which has the characteristic feature to reproduce inside the living cell is called “virus”. They can survive without the host for a long period of time. When they infect the host cell they use the cell machinery of the host to reproduce. The size of the virus is extremely small and varies from 20 to 300 nm. The wide area of Earth is occupied by the viruses.
Answer to Problem 1TYU
Correct answer: The viral genome consists of deoxyribonucleic acid (DNA) or ribonucleic acid (RNA). Hence, the correct answer is option (e).
Explanation of Solution
Reason for correct answer:
Viral genome can be DNA or RNA, but it cannot be both at the same time. The virus can have single stranded or double stranded genome. This makes the virus classified into four categories: ss DNA, ds DNA, ss RNA, and dsRNA. Viruses can possess only a single type of genome at a time. Thus, the virus consists of either DNA or RNA.
Option (e) is given as “DNA or RNA”.
The virus can have either “DNA or RNA” as its genome. Hence, the correct answer is option (e).
Reason for incorrect answer:
Option (a) is given as, “DNA”.
Some of the viruses also possess RNA as their genetic material. This means some of the viruses still carrying RNA as their genome. Hence, option (a) is incorrect.
Option (b) is given as, “RNA”.
There are a variety of species still exists which consist of DNA as their genome. This signifies that the variety of viruses are having different genetic material other than RNA Hence, option (b) is incorrect.
Option (c) is given as, “prions”.
A prion is an organism which does not affect by any radiation and the presence of either DNA or RNA was not found in them. Thus, such a structure cannot be considered as the genome. Hence, option (c) is incorrect.
Option (d) is given as, “DNA and RNA”.
Viruses cannot possess both DNA and RNA as their genome at the same time. They can have either DNA or RNA in their genome. Thus, both of these genomic materials cannot be considered as genetic material in viruses. Hence, option (d) is incorrect.
Hence, the options (a), (b), (c), and (d) are incorrect.
The genome of the virus can have either “DNA or RNA” at a time.
Want to see more full solutions like this?
Chapter 24 Solutions
Mindtap Biology, 1 Term (6 Months) Printed Access Card For Solomon/martin/martin/berg's Biology, 11th
- A virophage is best descirbed as:(a) A bacteriophage that requires a helper virus(b) An animal virus that can also infect bacteria(c) A giant virus(d) A phage that is used therapeutically to treat bacterialinfections(e) A satellite virus that inhabits its helper virus (i.e., itshost virus)arrow_forwardA chemical component that is found in all viruses is:(a) Protein (d) RNA(b) Lipid (e) Glycoprotein(c) DNAarrow_forwardWhat is the function of reverse transcriptase in retroviruses? a) It converts viral RNA into double-stranded DNA Ob) It uses viral RNA as a template for making complementary RNA strands Oc) It translates viral RNA into proteins d) It uses viral DNA as a template for RNA synthesisarrow_forward
- You have just isolated the covid-19 virus. Analysis of its genome reveals that it is composed of a single stranded RNA molecule containing 24% adenine. Based on this information, what would you predict the % cytosine to be? (a) 24% (b) 26% (c) 48% (d) 52% (e ) Cannot be determined from the information givenarrow_forwardThe second step in viral replication is entry. For bacteriophage, entry usually involves: O a) direct entry of the nucleic acid into the cell. Ob) phagocytosis. c) membrane fusion mechanism of entry. d) receptor-mediated endocytosis.arrow_forward27. Class VI animal viruses include HIV, Based on the type of viral genome, how is this class distinguished from the other classes of animal virus? A) It has double stranded RNA. B) It has single stranded RNA that serves as mRNA (positive sense). C) It has single stranded RNA that serves as a template for the synthesis of DNA. D) It has single stranded RNA that serves as a template for mRNA (anti-sense). does HIVarrow_forward
- Arrange the following list into the correct sequence for part of the cycle of a retrovirus: 1. dsDNA integrated into host DNA 2.viral proteins synthesized on host ribosomes 3. viral DNA uses host enzymes to transcribe viral RNA 4. reverse transcriptase catalyzes synthesis of ssDNA 5. synthesis of second DNA strand (a) 5, 2, 1, 3, 4 (b) 5, 2, 3, 4, 1 (c) 4, 5, 1, 3, 2 (d) 4, 1, 2, 3, 5 (e) 2, 1, 3, 4, 5arrow_forwardEukaryotic viruses a.) Can attach to LPS to promote viral entry b.) Can replicate in the host cell nucleus c.) Can inject their genome into the eukaryotic nucleus d.)Do not utilize host ribosomes for protein synthesis e.) Do not utilize host polymerases for genome replicationarrow_forwardRNA-dependent RNA polymerase performs which of the following functions? O 1) Uncoats the viral genome 2) transcribes retroviral RNA genomes into DNA 3) Replicates RNA into RNA O 4) Replicates DNA into RNA 5) Shuttles RNA genomes into the nucleus for assemblyarrow_forward
- Which of the following are the functions of reverse transcriptase in retroviruses? i) it hydrolyzes the host cell's DNA ii) it uses viral RNA as a template for DNA synthesis iii) it converts host cell RNA into viral DNA iv) it translates viral RNA into proteins v) It uses viral RNA as a template for making complementary RNA strand vi) It degrades RNA from DNA-RNA hybrid Oi, iv and v O ii, iv, v and vi ii and iii ii and viarrow_forwardA viral protein has a 20 amino acid amino acid chain consisting of the following primary structure: A-G-L-F-A-F-P-P-W-G-G-V-C-M-G-L-G-A-M-C In what places could these amino acids be found? a) Inside the hydrophobic core of a protein b) In a membrane that encloses the virus c) On the outside of a protein d) In a virus nail on the surface of the virusarrow_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_forward
- Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSONBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxAnatomy & 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 & CompanyLaboratory 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