false true Viruses do not reproduce within host cell Phagocytosis is type of .active transport R.B.Cs have no mitochondria Phospholipids have similar .structure to fat Prokaryotic cell has no .mitochondria Channel protein form a small opening through the cell .membrane All nucleic acids have no охудen In prophase stage chromosomes become shorter Cell is defined as basic functional unit of living organism Phospholipid bilayer of cell membrane has hydrophilic head only O O O O O O O O O

false true Viruses do not reproduce within host cell Phagocytosis is type of .active transport R.B.Cs have no mitochondria Phospholipids have similar .structure to fat Prokaryotic cell has no .mitochondria Channel protein form a small opening through the cell .membrane All nucleic acids have no охудen In prophase stage chromosomes become shorter Cell is defined as basic functional unit of living organism Phospholipid bilayer of cell membrane has hydrophilic head only O O O O O O O O O

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter21: Viruses

Section: Chapter Questions

Problem 1VCQ: Figure 21.5 Which of the following statements about virus structure is true? All viruses are encased...

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Match the terms 1Genome surrounded by a protein coat 2Functional viral particle capable to infect a new host cell 3Infectious protein 4Infectious agent that needs helper virus for infection 5T4 enzyme that creates holes in the E. coli plasma membrane 6When a temperate phage stimulates their bacterial host tostart producing a toxin (e.g. cholera, shiga) 7Virus that infects bacteria 8Hand N spikes 9Virus without an envelope 10Most common and best studies virulent phage of E. coli 11Protein coat that surrounds viral genome 12:true or false : some viruses can cause cancer [ Choose ] lambda True pathogenic stimulation False Nucleocapsid lysosome Naked virus induction lysozyme Flu viruses tobacco mosaic virus lysogeny capsid Lysogenic conversion Holin Prion satellite bacteriophage (or just phage) T4 Virion Streptococcus
During viral infection, attachment is usually specific to a particular celltype becausea. the virus is attracted to the appropriate host cells by proteinssecreted into the extracellular fluid.b. the virus recognizes and binds to specific molecules in thecytoplasm of the host cell.c. the virus recognizes and binds to specific molecules on the surfaceof the host cell.d. the host cell produces channel proteins that provide passageways forviruses to enter the cytoplasm.e. the virus releases specific proteins that make holes in the membranelarge enough for the virus to enter.
Virology:viruses were initially believed to not serve any essential function for their host.Today we know that viruses are very important and participate in commensalistic and mutualistic relationships with their hosts.Give one example describe how viruses can be beneficial to their hosts.Be specific and limit the response to less than 5 sentences
Polyomavirus and Papillomavirus, which is NOT correct? are circular dsDNA are icosahedral capsid are non-enveloped contain DNA and RNA polymerase their fusion with the host cell doesn’t involve in uncoating genome replicate in cytoplasm None of the above Both D and F D, E, and F
Viruses are obligate intracellular parasites. Rubella is also known as Exanthem subitum A. BOTH Statements are TRUE B. FIRST statement is FALSE; SECOND statement is TRUE C. FIRST statement is TRUE; SECOND statement is FALSE d. BOTH statements are FALSE
The envelope of an animal virus is derived from the_______________of its host cell.a. cell wallb. membranec. glycocalyxd. receptors
One of the following is CORRECT of the characteristics of herpesviridae? Can be dormant in the host cell is an air-borne and water-borne Some genera are oncogenic In some cases, it can reactivate and cause disease for life Viral nucleic acid is found in the host cell’s cytoplasm All of the above Both A, Cand D Both C and D Both B and E
Mycoplasmas attack the __________ of host cells.a. nucleus b. cell walls c. ribosomes d. cell membranes
What property of the retroviruses enables them to integrate into thehost genome?a. the RNA they carryb. presence of glycoprotein receptorsc. presence of reverse transcriptased. a positive-sense genome
MCQ A) One of the following is NOT of the characteristics of herpesviridae? Can be dormant in the host cell Some genera can cause cancer In some cases, it can reactivate and cause disease for life In some cases, it can cause no disease Viral nucleic acid is found in the host cell’s cytoplasm Air-borne and water-borne Both A and C Both E and F Both D and E B) Human Papillomaviruses are characterised by all of the following EXCEPT A genome of double-stranded circular DNA encoding around eight open reading frame These viruses are small naked and icosahedral They replicate in dividing cells and encodes three oncogenic proteins E5, E6 and E7 These viruses transmit primarily by nosocomial infection in hospitals HPV serotypes 14, 16, 18, 31, 45 are known to cause cervical cancer C) Internationally, which clinical sample, at minimum, is used to diagnose COVID-19? Lung biopsy Blood Faeces samples oropharyngeal or nasopharyngeal swab lower respiratory specimens: sputum (if produced)…
Think about the cells that viruses infect. Pick out the correct statements below. A. The host cell has some particular thing - be it machinery, chemistry or whatever - that the virus MUST have in order to successfully reproduce. B. Viruse generally don't care what cells they infect. C. Viruses can only replicate in particular hosts and tissues. D. The host range or tissue specficity means the specific type of cells the virus infects. Example - rabies infects neural cells.
Figure 21.10 Which of the following statements is false? In the lytic cycle, new phages are produced and released into the environment. In the lysogenic cycle, phage DNA is incorporated into the host genome. An environmental stressor can cause the phage to initiate the lysogenic cycle. Cell lysis only occurs in the lytic cycle.