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goblinko [34]
2 years ago
11

Which of the following cell organelles is thought to have once lived as a free-living

Biology
1 answer:
ladessa [460]2 years ago
7 0

Answer:

Ribosomes here is your answer

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In which of the following ways does a bacterial cell differ from an animal cell?
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Answer: It would be option D, "a bacterial cell does not have membrane-bound organelles, whereas an animal cell does." Bacteria cells are prokaryotic. This means that they have no membrane bound nucleus or membrane bound organelles whereas a plant or animal cell does.

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What would a person who is working to insert a new gene into an organism might
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the answer is GENETICS

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Genes are portions of the DNA that provide information to makeproteins. Proteins are long strings of (b)________________________
g100num [7]

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1. 20 different amino acids.

2. Genes

3. nucleotides

4. uracil

Explanation:

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3 years ago
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Plants maintain higher levels of phytochrome at their growing tips where phytochrome plays important roles in growth responses t
Naddika [18.5K]

Explanation:

Phytochrome is a protein with kinase activity present in plant organisms, whose function is to act as a photoreceptor mainly of red light (600-700nm) and distant red light (700-800nm), thanks to its chromophore. The phytochrome depending on the type of light detected can trigger different responses in the plant, such as flowering, germination, growth as an escape response to the shadow -development of epicotyls at night and cotyledons during the day-, regulation of expression of metabolic activity during day and night (circadian rhythms).

Phytochromes were discovered in the fifties as part of an investigation on the effect of light on the germination of lettuce seeds. It was observed that the seeds that germinated in the dark did not reach 20%; On the contrary, the germination percentage was maximum when the seeds were irradiated with a pulse of red light (R). It was also found that subsequent irradiation with a pulse of distant red light (RL) nullified the inducing effect of red light, preventing germination.

Alternating irradiation with light R and RL (R, R + RL, R + RL + R, R + RL + R + RL, etc.) showed that the last color applied determined the germination of the seeds and that the light red was the stimulating factor of the process and, its inhibitor, the distant red light.

In search of an explanation of such phenomena, the existence of a pigment was proposed, which they called phytochrome, which absorbed the red light. The phytochrome in question, after absorbing red light, became a way capable of absorbing distant red radiation; form that turned to its initial condition after performing said absorption. The hypothesis found experimental support in the early sixties with the purification, from extracts of cereal seedlings, of a protein endowed with the predicted characteristics. Phytochromes are soluble proteins found in the seeds, leaves, stems, roots and other organs of the plant.

Biochemically, phytochrome is a protein with a Bilin chromophore.

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3 years ago
Which cell structure is enclosed in a double membrane and is response for communicating with all other parts of the cell?
Nostrana [21]

Answer:

Eukaryotic Cells,

hope this helped!

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3 years ago
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