1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
tensa zangetsu [6.8K]
3 years ago
9

Viewpoint #1 - The word “virus” has its origins in the Latin term for “poison.” In the late 19th century, scientists discovered

agents that behaved like bacteria causing diseases such as rabies and hoof-and-mouth, but were much smaller. Like bacteria, viruses contain one of the two nucleic acids: DNA or RNA. The scientists noticed that these particles could be spread from one person to another, with serious consequences: illness and death. At this time it became the general view that viruses were biologically "alive," the simplest of all life on Earth.
An important characteristic of life is the response to stimuli. Scientists noted that viruses may exist in two distinct states. When they are not in contact with a host cell, the virus remains dormant. Today, this is called the lysogenic cycle. During this time there are no biological activities occurring and the virus is really just a particle. Viruses can remain in this dormant, non-living state for extended periods of time, waiting to come into contact with a host cell. When the virus comes into contact with the host, it becomes active, reacts to its environment and/or host and directs all its energy toward reproduction. This cycle is referred to as the lytic cycle. The viral goal now is to produce more viruses that then attack more host cells.

Viewpoint #2 - In 1935 scientists discovered and crystalized the virus responsible for the tobacco mosaic virus. They discovered that viruses consisted of a nucleic acid, either DNA or RNA, surrounded by a protein shell. Once again, the scientific view changed: viruses may be complex biochemical particles but they are not alive.

Viruses depend on the host cell for the raw materials and energy necessary for nucleic acid and protein synthesis, as well as all other biochemical activities that allow the virus to multiply and spread. Most simple life forms use cell division to reproduce, while viruses spontaneously assemble within cells. They concluded that even though reproduction occurs under viral direction, viruses are simply nonliving parasites of other life forms.

The simple question of whether or not viruses are alive, has defied a simple answer because it raises the fundamental issue: What defines life?

Viral Replication


Consider the debate about whether viruses are alive or not. Both Viewpoint #1 and Viewpoint #2 have points of evidence in common. That includes ALL BUT

A) viruses are pathogens.
B) viruses require a host cell.
C) viruses undergo cell division.
D) viruses contain a nucleic acid.
Biology
1 answer:
PilotLPTM [1.2K]3 years ago
5 0

Answer:

yes it is one point we help everybody

Explanation:

and the most

You might be interested in
Which term describes the study of the functions of the structures of the body?
valentina_108 [34]
<span>Physiology is studying the function of a certain body part.
</span><span>Anatomy is learning about the relationship between body parts. </span>
i think...
4 0
2 years ago
Read 2 more answers
Two species of closely related frogs are found in the same pond high in the Andes of South America. Both species only have teeth
IgorLugansk [536]

Complete question:

Two species of closely related frogs are found in the same pond high in the Andes of South America. Both species only have teeth on the top jaw. One has small teeth for holding small live prey prior to swallowing. The other species has very large sharp teeth for injuring and killing large prey prior to biting off pieces of flesh for consumption. The above is an example of:

  • Directional selection
  • Analogous structures
  • Character displacement
  • Hybridization
  • Vestigial structures

Answer:

  • Character displacement

Explanation:

Competition is an ecological and evolutive process very common in nature. Competition might be intra- or interspecific. Competition between different species in a community or ecosystem might be due to the same resource use, or the same territory, shelter, etcetera. When a resource is useful for two or more species, and limited, they compete to gain it.

The principle of competitive exclusion states that different species with the same requirements sharing the niche can not coexist indefinitely based on the same limited resource. When <u>two competing species coexist, this is because of niche partitioning or niche differentiation</u>.

Differentiation of effective niche is closely related to <u>character displacement.</u>

<u>Character displacement</u> is the result of interspecific competition, in which two or more species that live in the same habitat manage to avoid competition by developing different traits. Morphological divergence, or any adaptative trait development, fixated genetically, is the product of niche segregation. Species tend to differentiate morphologically in the presence of strong competitors. Traits divergence favors coexistence in the same place.

In the exposed example, both species live in the same pond. But to avoid competition and competitive exclusion, species developed different teeth sizes to feed on different prey items.  

8 0
2 years ago
The chemical energy of these plants all started with what energy source?
Zielflug [23.3K]

Answer:

Sun(solar energy)

Explanation:

The sun is the ultimate source of energy in our solar system.

The chemical energy in plants all started out with solar energy from the sun.

During the process of photosynthesis;

  • green plants manufactures their food using sunlight.
  • in the presence of this solar energy, they combine carbon dioxide and water to produce glucose and oxygen.

Photosynthetic reaction simply converts solar energy from the sun into chemical energy.

Almost all animals obtain their own energy needs from the plants converting the chemical energy into other forms of energy.

4 0
3 years ago
Which part of the earth system interacts with solar flares?
ss7ja [257]
The magnetosphere interacts with solar flares. It helps to redirect them. Otherwise, the Earth would be greatly heated and human life would become much harder to sustain, as homeostasis would require better cooling mechanisms.
5 0
2 years ago
Which is another way to write Newton’s third law <br> A.F=ma<br> B.F=m/a<br> C.F=m+a
8_murik_8 [283]

Answer:

B.F=m/a

Explanation:

6 0
3 years ago
Read 2 more answers
Other questions:
  • All of the following stages must occur for a woman to get pregnant. However, after which stage can a woman be described as pregn
    9·1 answer
  • A nurse is teaching a client about self-management techniques for smoking cessation. Which statement made by the client indicate
    7·1 answer
  • A group in which the variable is changed in an experiment is called ___
    15·1 answer
  • A homozygous red flower is crossed with a homozygous white-flowered what are the expected phenotypes of The offspring
    7·1 answer
  • Compare and contrast osmotic challenges faced by animals in freshwater, marine, and terrestrial environments, and the adaptation
    6·2 answers
  • Which of the following best describes the cell below? A. protist cell B. eukaryotic cell C. prokaryotic cell D. plant cell
    8·2 answers
  • Assuming that a person going to community college can't afford to go to a four-year college is an example of a) a generalization
    11·1 answer
  • Although diffusion occurs naturally without action from a cell, diffusion benefits cells. How do cells benefit from diffusion?
    7·1 answer
  • A poodle and a Labrador can mate and have a offspring.
    6·1 answer
  • Can someone pls answer the first 2
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!