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LekaFEV [45]
3 years ago
8

All bacteria are classified as a. prokaryotes. b. eurkaryotes c. protista.

Biology
1 answer:
fredd [130]3 years ago
6 0
They are prokaryotes
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In the 1920s, bacteriologist Fred Griffith demonstrated that a heat-killed, infectious pneumococcus produced a substance that co
Juliette [100K]

Answer:

Some substance in the infectious S strain could change the harmless R strain into the more lethal form.

Explanation:

These first type of experiments where crucial to advance in DNA knowledge.

In one experiment, they treated the material with enzymes that destroy all proteins. This is important because scientist notice that there was something else that was causing the strain to change into a lethal form and was heritable (DNA).  Know a days we know that plasmids are responsible for such transformation.

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3 years ago
Which is a characteristic of all vertebrates?
Bond [772]

The presence of vertebral column or notochord at any stage of life in any organism is the characteristic of vertebrate.

Explanation:

An animal is vertebrate if it fulfils the following criteria:

Presence of vertebral column or notochord.

Presence of endoskeleton or backbone.

The spinal cord runs above the vertebral column.

Humans embryo has notochord which becomes a vertebral column.

The alimentary canals end in the anus.

Mouth is present ta the anterior side of the vertebrate.

Have legs, fins or wings for movement.

Presence of a nervous system and sensory organs.

Presence of skin, lungs or gills.

Presence of a circulatory system.

Vertebrates include fish, amphibians, reptiles, birds and mammals.

6 0
3 years ago
Nuris is writing a paper on the scientist who first named cells after studying cork under a microscope. Who is her paper about?
Tju [1.3M]

Answer: the answer is c

Explanation: its Robert Hooke

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3 years ago
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How does carbon moves through the system in the dark?
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Answer:

Generally, about half of the caught carbon is released in respiration. ... When it is dark, the only flow of CO2 comes from respiration.

Explanation:

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3 years ago
How does the respiratory system in birds differ from the mammalian respiratory system?
DaniilM [7]

Answer:

Birds require high levels of oxygen and, therefore, high rates of gas exchange due to flight demands. Avian resting oxygen consumption is high compared to that of mammals and other vertebrates, and this increases even more during the flight.

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Compared to mammals, birds have specific adaptations of the respiratory system that result in higher levels of oxygen exchange.

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3 years ago
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