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Alekssandra [29.7K]
3 years ago
12

A scientist is looking at cells through the microscope. To determine if they are prokaryotic or Eukaryota, what should she look

for? please answer
1. DNA

2. Nucleus

3. Ribosomes

4. ER
Biology
1 answer:
andre [41]3 years ago
5 0

Answer:

The correct option no is 2. To determine if they are prokaryotic or Eukaryota she should look for the <u>nucleus.</u>

Explanation:

Prokaryotes can be described as organisms that are single-celled and lack membrane-bound organelles. Eukaryotes can be described as multicellular organisms and they possess membrane-bound organelles.

In Eukaryotes, the hereditary material is present inside a membrane-bound organelle termed as the nucleus. The prokaryotes do not have a nucleus and their hereditary material is present in the cytoplasm. Hence, option no 2 is correct.

Other structures like DNA and ribosomes are present both in the prokaryotic and eukaryotic cells.

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Answer:

The organisms that harness non-biological energy and convert it to biologically relevant/useful energy are called __<u>autotrophos or producers</u>_. The organisms that consume these are called _<u>herbivores</u>_ (it should end in -ores) which occur at the __<u>second</u>_ trophic level. The number of trophic levels that any ecological system will primarily dependent on the _<u>consumer</u>_ organisms.

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 In the trophic web occurs energy transference through organisms occupying different levels in the chain. Each level feeds on the preceding one and becomes food for the next one. The first link is occupied by autotroph organisms, which are the producer. The following links are the consumers: herbivores are primary consumers and feed on producers. Carnivores are secondary consumers and feed on herbivores, and so on. The last links are the decomposers, microorganisms that act on dead animals degrading organic matter.  

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Autotrophs or producers synthesize inorganic substances, such as light, and turn them into organic matter according to their own needs. These organisms are photoautotrophs, such as plants, or chemoautotrophs. They occur at the first trophic level.

Heterotrophs are those incapable of producing their own organic matter, so they feed on producers, depending on them to get proteins and energy. In the trophic chain, heterotrophic organisms occupy the first, second, or third consumer level, after producers. These animals can be herbivorous, carnivorous,  omnivorous, hematophagous, ichthyophagous, and etcetera. All of them depend on autotrophic organisms.

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In general, most trophic chains are composed of 4 or 5 levels, depending on the number of consumers present, and the energy transference between levels.

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