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Aleksandr [31]
3 years ago
9

scientists believe the first organism to appear on earth were prokaryotic which of the following best represents what the cell s

turcture of these organisms may have looked liked is it A. contracile vacuole B.chlorplast C.dna or D. nucleus
Biology
2 answers:
eduard3 years ago
6 0

Ans. (B). chloroplast.

Prokaryotes are first organisms that appeared on the earth. These organisms lack true nucleus and other membrane -bound organelles. According to the studies, cell structure that resembles these prokaryotic organisms are mitochondria and chloroplasts.

This is because, chloroplasts and mitochondria have their own circular DNA to synthesize enzymes and proteins for cellular functions, double-membrane covering, and ribosomes, all of which are  also present in prokaryotes.

Thus, the correct answer is option (B).

Zielflug [23.3K]3 years ago
4 0
Hi!

The answer is B. chloroplast because prokaryotic cells don't have contractile vacuoles, DNA, or a nucleus. 

Hope this helps!  :))<span />
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Mitosis and meiosis are similar processes, but they have some very important differences. Explain how mitosis a d meiosis are al
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3 years ago
Using sophisticated molecular cloning techniques, you have isolated the genes for two serotonin transporters, called TransA and
kherson [118]

Answer:

Vesicles  

Explanation:

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Most neuronal cells have vesicles in their interior, which are organelles that store neurotransmitters for exportation -by exocytosis- or from recycling -by endocytosis-. These vesicles also protect the neurotransmitter from the enzymatic action.

Vesicles form in the cellular soma, from where they are transported to nervous terminals. Once the vesicle releases the neurotransmitter to the intercellular space, their membrane remains available in the plasmatic membrane to be reused.

The neurotransmitter concentration in the vesicle interior is related to the storage system and the <u>transport system</u>. There are <u>specialized transporter proteins in the vesicle membrane</u> that are involved with the introduction of the molecule to the organelle.

In the exposed example, transporter Trans B might be located in the vesicle membranes, and hence could be found in the cytosol of the cells.

4 0
3 years ago
________ are cells that make up the brain and spinal cord and transmit electrical signals from receptor to effectors.
Dafna11 [192]
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3 0
2 years ago
What type of relationship exists between a bromeliad tree and a strawberry poison dart frog?
Pavel [41]

Answer:

<em><u>mutualism</u></em>

As Mackenzie told us, the mutualism between strawberry poison dart frogs and bromeliads is “evidence of the complexity that exists in the biological world and the interconnectedness of species.”

Explanation:

Hope it helps you..

Your welcome in advance..

(ㆁωㆁ)

3 0
2 years ago
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