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olga55 [171]
3 years ago
13

If one defines life as the simplest form capable of displaying the most essential attributes of a living thing, one very quickly

realizes that the only real criterion for life is the ability to replicate. Only systems that contain nucleic acids are capable of this phenomenon. This sort of reasoning has led to a new definition of organism: An organism is the unit element of a continuous lineage with an individual evolutionary history. Considering the new definition of life, all but one piece evidence supports the fact that a virus must be referred to as an organism. That is: A) Viruses contain nucleic acids. B) Viruses are capable of replication. C) Viruses have a simple cellular structure. D) Viruses have an evolutionary history and that implies lineage.
Biology
2 answers:
melamori03 [73]3 years ago
4 0

C). Viruses have a simple cellular structure.

SCORPION-xisa [38]3 years ago
4 0

The correct answer is C. Viruses have a simple cellular structure

Explanation:

Viruses are a microorganism that contains nucleic acids and therefore are can replicate and create a lineage. This according to new definitions of life make viruses living organisms as the text defines "the only real criterion for life is the ability to replicate" which is accomplished by viruses. However, that viruses have a simple cellular structure is not a piece of evidence that supports the idea they are living organism, as simple or complex structures do not define life but this is only defined by the ability to replicate or form lineage and therefore contain nucleic acids. Thus the correct option is C.

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Pepsin is a digestive enzyme. It is made in an inactive form, pepsinogen, which is activated by the acidity of the stomach to se
Paladinen [302]

Answer: Positive feedback loop

Explanation:

Even before the food reaches the stomach (before ingesting it), the glands of the stomach mucosa begin to release its gastric secretion. The main characteristic of this secretion is acidity, as measured by pH (one of the physiological variables).

This acidity is a result of the presence of hydrochloric acid, which is part of the secretion composition. In addition to it, water, pepsinogen (which will give rise to the enzyme pepsin) and the intrinsic factor. The acid has a function of the protection of the entire system by eliminating microorganisms. It is also responsible for the activation of pepsin (which only occurs with acid pH), the enzyme that digests proteins containing the amino acids leucine or phenylalanine or tryptophan or tyrosine.

The concept of Positive feedback loop states that the body tries to increase the value of a variable (acidity, in the case of pepsinogen) when it is below its optimal value (called a point adjustment) and decreases this value when it is above optimal.

5 0
3 years ago
Abnormal softening of a gland is known as
Greeley [361]
Abnormal softening of a gland is known as the adenomalacia.
8 0
3 years ago
Which of these proteins in mammals show only primary and secondary structures? A.)oxytocin. B.)keratin. C.)hemoglobin
xz_007 [3.2K]
I think the correct answer from the choices listed above is option B. Keratin is the protein in mammals which shows only a primary and secondary structure. Keratin is a fibrous protein forming the structural constituent of hair, feathers, hoofs, claws and many others.
6 0
3 years ago
Endocrine and digestive systems major organ
never [62]

Answer:

The major glands of the endocrine system are the hypothalamus, pituitary, thyroid, parathyroids, adrenals, pineal body, and the reproductive organs (ovaries and testes). The pancreas is also a part of this system; it has a role in hormone production as well as in digestion.

Explanation:

6 0
3 years ago
How does a gastrovascular cavity differ from a digestive tube? the gastrovascular cavity __________. how does a gastrovascular c
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Answer:

Option D, has only a single opening

Explanation:

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Hence, option D is correct

4 0
3 years ago
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