The characteristics in virus due to lack of an envelope. Introduction: A virus is defined as a noncellular infectious particle that replicates only inside a living cell. A viral particle is a virus that is not present inside a host cell. Viruses are divided into two types on the basis of presence of an envelope. Enveloped viruses are specifically surrounded by an outer lipid membrane. Lipid membrane is absent in nonenveloped viruses. The tobacco mosaic virus, Rhinoviruses, and the T4 bacteriophage are nonenveloped viruses. Most animal viruses such as HIV (Human Immunodeficiency virus) are covered by an envelope.

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Rhinovirus, the most common cause of colds, do not have a lipid envelope. Compared to enveloped viruses these and other nonenveloped viruses tend to remain infectious outside the body longer, are more likely to be spread by contact with surfaces, and are likely to be rendered harmless by exposure to hand sanitizer or hand washing. Explain how the lack of an envelope could contribute to these characteristics.

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Chapter 19, Problem 1CT

Summary Introduction

To explain:

The characteristics in virus due to lack of an envelope.

Introduction:

A virus is defined as a noncellular infectious particle that replicates only inside a living cell. A viral particle is a virus that is not present inside a host cell. Viruses are divided into two types on the basis of presence of an envelope. Enveloped viruses are specifically surrounded by an outer lipid membrane. Lipid membrane is absent in nonenveloped viruses. The tobacco mosaic virus, Rhinoviruses, and the T4 bacteriophage are nonenveloped viruses. Most animal viruses such as HIV (Human Immunodeficiency virus) are covered by an envelope.

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