All categories

2 years ago

What are the strengths and weaknesses of the tobacco mosaic virus hypothesis

Biology

2 answers:

Elan Coil [88]2 years ago

7 0

Answer:

Strengths: crystallization potential

Weaknesses: dependent on the host plant

Explanation:

Smoke mosaic viruses caused by TMV (Tobacco mosaic virus) infect several plants. Symptoms induced by tobacco mosaic virus (TMV) are somewhat dependent on the host plant and may include mosaic mottling, necrosis, dwarfism, leaf curl, and yellowing of plant tissues.

The tobacco mosaic virus (TMV) was first observed by scientist Wendel Stanley (1904-1971).

This scientist, awarded the Nobel Prize in Chemistry in 1946, discovered the crystallization potential of TMV and the ability to infect and spread the virus in healthy plants (Tobacco) even after an extended period of latency.

From application and development, using electron microscopy, it was possible to verify that this virus manifests an external composition formed by a protein capsule, consisting of helically arranged globular proteins lining an RNA strand.

Normally, the most common consequence of viral action is related to plant development (decline in growth rate), ie contaminated plants grow less than healthy ones.

The mechanism of viral transmission is quite distinct, can occur through agents that inoculate the disease (a vector: insect, fungus and nematode), through pollen and seeds containing the virus, and even through a mechanism called diffusion. mechanized, where the crystallized virus settles in subsequent botanical specimens due to man-induced manipulation (mechanization in large crops).

liberstina [14]2 years ago

5 0

<span>Tobacco Mosaic Virus (TMV) will not multiply unless it is brought in contact with a living cell and once it contacts the living cell it will not stop its multiplication.</span>

You might be interested in

Conjugation is a very effective process for spreading antibiotic resistance among diverse bacterial populations such as those fo

ololo11 [35]

Answer:

B) Two different species of bacteria can share DNA, including antibiotic-resistance genes, during conjugation.

Explanation:

Conjugation is a process by which bacteria can exchange their genetic material between them. So through conjugation, the antibiotic-resistant gene coded by plasmid can be transferred through sex pilus to another bacteria.

So due to conjugation two different species of bacteria can share DNA which can include antibiotic-resistant genes. Therefore, through conjugation genetic variation and evolution are favored in bacteria. So due to this reason conjugation is a very important process in bacteria to spread antibiotic-resistant genes.

7 0

2 years ago

Which is associated with divergent boundaries

DedPeter [7]

Divergent boundaries are typified in the oceanic lithosphere by the rifts of the oceanic ridge system, including the Mid-Atlantic Ridge and the East Pacific Rise, and in the continental lithosphere by rift valleys such as the famous East African Great Rift Valley. I don't know your answer choices but I hope this helps!!!!!!

3 0

3 years ago

Read 2 more answers

All of the following are functions of the peripheral nervous system except

mixas84 [53]

The right option is; it interprets signals from the external environment

The peripheral nervous system (PNS) is made up of all parts of the nervous system, except the brain and spinal cord (parts of the central nervous system). The peripheral nervous system functions as a channel through which neural signals are transferred from and to the central nervous system. Two types of neurons (sensory and motor neurons) functions in the PNS. The motor neurons transfer neural signals from the central nervous system directly to various muscles, glands, and organs (effectors) throughout the body.

3 0

3 years ago

Read 2 more answers

Describe three different types of evidence that scientists use to support the theory of evolution. Explain how each piece of evi

AlekseyPX

Answer:

1. Molecular evidence: similar proteins and genes found in closely related species, even if those genes are not used by an organism.

2. Fossil evidence: organisms changing form over time through the fossil record.

Direct observation. We can directly observe small-scale evolution in organisms

with short lifecycles (e.g., pesticide-resistant insects).

Explanation:

4 0

2 years ago

Are virus considered liveing organisms

Elena L [17]

Viruses are not considered alive, because they lack certain aspects that would be considered a living organism.

8 0

3 years ago