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3 years ago

According to cell theory, viruses are considered nonliving because they

Biology

2 answers:

jarptica [38.1K]3 years ago

6 0

D) lack the ability to reproduce without as stated in cell theory

iris [78.8K]3 years ago

3 0

Answer: D) lack the ability to reproduce without a host.

Explanation:

Those who argue that the virus is not a living thing assume that he has no free life, for its replication is possible only within a living cell. Also, some of these agents can crystallize when subjected to adverse situations. Although they can replicate, viruses do not have the enzymatic apparatus sufficient for replication, thus requiring the cellular machinery to complete its replicative cycle, which makes it a mandatory intracellular parasite.

Its apparent fragility, being strictly cell-dependent, is dismissed by its ability to control and redirect cellular metabolism to its benefit. Despite the low structural complexity, it can cause major damage to the host cell, even though morphologically presenting only genetic material, a capsid and, in some viruses, an envelope.

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2 years ago

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Answer:

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2 years ago

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In humans, the quadriceps muscle is a skeletal leg muscle under voluntary control. As such, it contracts in response to signals

Masja [62]

Answer:

The correct answer is - operation of reflex arc.

Explanation:

The reflex arc is a unique and special type of neural pathway that starts with a sensory neuron and ends with a motor neuron. In this operation sensory neuron acts as the receptor and motor neuron is effector. This type of neural circuit helps in faster response.

Voluntary muscles like quadriceps muscle are normally in control voluntarily however, such muscle may contract involuntary due to reflex arc. This type of contraction takes place before the signal has even reached the brain.

In this response the sensory neuron takes the signal to the spinal cord and then motor neuron to the effector muscle for faster response.

Thus, the correct answer is - operation of reflex arc.

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