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
34kurt
4 years ago
12

Scientific researchers discovered agents that behaved like bacteria causing diseases such as rabies and hoof-and-mouth, but were

much smaller. At this time it became the general view that viruses were biologically "alive." This changed in 1935 when the tobacco mosaic virus was crystallized and scientists demonstrated that the particles lacked any mechanisms necessary for metabolic function. It was determined that viruses consisted of a nucleic acid, DNA or RNA, surrounded by a protein shell and the scientific view changed: viruses are complex biochemical mechanisms but not alive. When not in contact with a host, the virus remains dormant. During this time there are no biological activities occurring and the virus is nothing more than a static organic particle. In this state viruses can remain for extended periods of time, waiting to come into contact with the appropriate host. When in contact with a host, it becomes active, reacts to its environment and/or host and directs its efforts toward self-replication. The viral goal now is to produce more viruses to attack host cells.
According to the passage all BUT ONE is a reason to classify viruses as living. That is they

A)
are capable of protein synthesis.


B)
contain a nucleic acid, DNA or RNA.


C)
response to changes in the environment.


D)
lack mechanisms for metabolic function.
Biology
2 answers:
gizmo_the_mogwai [7]4 years ago
8 0
I believe the answer is B
zysi [14]4 years ago
3 0

   The Answer is D. .........

                 

You might be interested in
In an ecosystem, a group of birds eat fruit from a tree. When the birds drop the fruit on the groundthe mice ea the fruit. Seeds
SOVA2 [1]

Answer:

The correct answer is - interdependence.

Explanation:

In this ecosystem, all the organisms, tree mice, and birds all depend on one another for their food and growth. Birds get their food from fruits from the tree and the fruits that dropped by the birds to the ground used by the mice for their food.

In return mice and birds spread the seeds of the tree to the area which helps in the growth of the more trees. This relationship among the organisms is an example of interdependency.

4 0
3 years ago
Read 2 more answers
Which best describes a person's carbon footprint?
hoa [83]

A. The amount of carbon dioxide a person releases into the atmosphere

4 0
3 years ago
Why do you think some bones, such as the humerus and femur, have rounded ends? Why do you think other bones, such as the vertebr
alekssr [168]

Answer:

1. Their rounded shape allow them to joint properly with other bones, permitting a softer, better motion.

2. Provide protection for specific organs and their shape provides a broad surface for the proper attachment of muscles.

Explanation:

The bone is a <u>connective tissue composed of specialized cells, a mineral-salt matrix, and collagen fibers</u>. The main functions of the bones are <em>organ protection, structure, red and white blood cell production and support.</em>

There are different types of bones:

  • Long
  • Short
  • Flat
  • Sesamoid
  • Irregular
  • Sutural

Some bones, such as the humerus and femur, are characterized by their rounded ends, also known as <em>epiphyses </em><em>(epiphysis - singular)</em>. The reason behind epiphyses is joint function. These bones are long bones, and their rounded shape allow them to ajoint properly with other bones, permitting a softer, better motion.

On the other hand, flat bones, such as vertebrae and carpals, provide protection for specific organs and their shape provides a broad surface for the proper attachment of muscles.

8 0
3 years ago
What is the population size equation
yulyashka [42]




A population estimate is a calculation of the size of a population for a year between census periods or for the current year.
8 0
3 years ago
A light-year is approximately 9.5 trillion kilometers. True False
Yuliya22 [10]
True 1 light-year = 9.461e+12 
if you round 4 it is 5 so yes 9.5 KMH
4 0
3 years ago
Read 2 more answers
Other questions:
  • The hormone adh is produced by cells whose bodies are in the ____, but it is actually released or secreted in the _____.
    5·1 answer
  • Why it is necessary to water the plant for experiment​
    7·2 answers
  • Pls help me um I need help easy
    15·1 answer
  • What letters do we use to represent the base pairs
    13·1 answer
  • Molten rock rises in Earth's mantle and then sinks back toward the core in a circular pattern, this method of heat transfer is k
    11·1 answer
  • You work for a zoo where you manage the breeding program for the cheetah. Your goal is to prevent inbreeding by obtaining mates
    9·1 answer
  • D
    5·1 answer
  • How is infiltration related to groundwater?
    13·1 answer
  • How can natural selection account for the long tongues of butterflies?
    8·1 answer
  • 4 Factors in population growth rate
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!