04:395 Differences between Virus and Viroid | Virus vs Viroids| BiologyExams4u |biologyexams4u698views
01:56Meet Tobacco Mosaic Virus (TMV). TMV has a family called Virgaviridae.simpleshow video maker1087views
27:52Transmission of plant viruses | Mechanical and vector transmission of plant virusesThe World of Plant Pathology630views
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12:44Influenza Virus: Flu, Genetic Drift & Shift, Neuraminidase & HemagglutininStomp On Step 1711views
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06:45Positive-sense Single-stranded RNA ((+)ssRNA) Virus – RNA Virus Genomes – COVID-19 | LecturioLecturio Medical857views
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05:11Viruses - Part 1: Enveloped and Non-Enveloped VirusesAMBOSS: Medical Knowledge Distilled1243views
02:52Plaque Assay: Assay for estimating viral titre or viral concentration [plaque forming units / mL]Bio-Resource690views
01:48Molecular mechanism of bacteriophage tail spike proteins in bacterial infectionZHAW School of Life Sciences & Facility Management397views
03:30Bacteriophage Introduction | nano-biomachines | Basic Science SeriesBasic Science Series English451views
09:41Microbiology - Viruses (Structure, Types and Bacteriophage Replication)Armando Hasudungan328views
Multiple ChoiceViruses can vary with respect to all of the following characteristics except __________. 784views
Multiple ChoiceA microbiologist analyzes chemicals obtained from an enveloped RNA virus that infects monkeys. He finds that the viral envelope contains a protein characteristic of monkey cells. Which of the following is the most likely explanation? 1026views
Multiple ChoiceHIV, the virus that causes AIDS, only infects certain cells within the immune system. This is because __________. 711views
Multiple ChoiceWhen a virus infects an E. coli cell, what part of the virus enters the bacterial cytoplasm? 593views
Multiple ChoiceThe phage reproductive cycle that kills the bacterial host cell is a __________ cycle, and a phage that always reproduces this way is a __________ phage. 641views
Multiple ChoiceRestriction enzymes help defend bacteria against viral infections by __________. 686views
Multiple ChoiceThe avian flu virus H5N1 is considered a greater long-term threat than the swine flu virus H1N1 because __________. 702views
Multiple ChoiceWhich of the following is an example of vertical transmission of a virus in plants? 824views2rank
Multiple ChoiceWhat is the origin of the phospholipid membrane that envelops many animal viruses? 545views
Multiple ChoiceWhy can flare-ups of herpesvirus infection recur throughout a person's life? 836views1rank
Multiple ChoiceReverse transcription, carried out by retroviruses, is the process by which __________. 657views
Multiple ChoiceWhich statement below is a correct comparison of a "regular" RNA virus and an RNA retrovirus? 379views
Multiple ChoiceVaccines for viral diseases are __________ and help prevent infection by __________. 792views
Textbook QuestionCompare and contrast the bacteriophage lytic cycle and lysogeny by addressing (1) the rate of replication of the viral genome, (2) production of virions, and (3) effect on the host cell.975views
Textbook QuestionIf you come down with the flu, should your physician prescribe an antibiotic for you? Explain why or why not.367views
Textbook QuestionOf the viruses highlighted in Section 33.4, predict which of the following would be able to make viral proteins if nothing more than its genome were injected into a suitable host cell. a. pea mosaic ([+]ssRNA) virus b. bluetongue (dsRNA) virus c. measles ([−]ssRNA) virus d. human immunodeficiency (RNA reverse-transcribing) virus389views
Textbook QuestionWhich of the following is/are always true? a. Viruses cannot reproduce outside a host cell; b. Viruses are not surrounded by a membrane; c. Viruses are not made up of cells; d. A and C are correct; e. A, B, and C are correct1283views
Textbook QuestionThe mosquito-borne Zika virus (ZIKV) is one of the most feared viruses for pregnant women. Recent statistics justify this fear: Infants born to mothers infected with ZIKV during pregnancy face a risk of up to 42 percent of developing birth defects, including microcephaly (an abnormally small head and decreased brain volume). What do we know about how ZIKV causes damage to the developing brain? Several lines of evidence suggest that after ZIKV is transmitted to a pregnant woman via the bite of an infected mosquito, the virus then directly infects cells of the placenta, gaining access to the fetal brain. Following attachment, the virion would most likely enter the placental cell by: a. insertion via the mosquito's mouthparts b. endocytosis c. degrading the cell wall with lysozyme d. injection through a hollow, needle-like protein structure397views
Textbook QuestionThe mosquito-borne Zika virus (ZIKV) is one of the most feared viruses for pregnant women. Recent statistics justify this fear: Infants born to mothers infected with ZIKV during pregnancy face a risk of up to 42 percent of developing birth defects, including microcephaly (an abnormally small head and decreased brain volume). What do we know about how ZIKV causes damage to the developing brain? Traveling and tourism have been badly affected in ZIKV-affected countries. What advice would you give a friend planning a trip to the Caribbean?400views