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Artemon [7]
2 years ago
9

PLEASE HELP QUICKLY!! WILL GIVE BRAINLIEST

Biology
1 answer:
snow_lady [41]2 years ago
6 0
The answer is part b
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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.

6 0
3 years ago
FOR 33 POINTS seismic belts are relatively narrow and tend to follow tectonic plate boundaries true or false
IRINA_888 [86]
True the tend to follow bounderies.
5 0
3 years ago
Read 2 more answers
The membrane structures that make up the cell are called
BlackZzzverrR [31]
B organelles
Like the mitochondria
7 0
3 years ago
DELETION OF SNORD116, A PRADER-WILLI SYNDROME CANDIDATE GENE, DOES NOT AFFECT CIRCADIAN RHYTHMS IN MICE MODELS
Vlada [557]

Prader-Willi syndrome (PWS) is a gentic disorder which has an impact on numerous physiological systems. PWS affected individuals (specifically babies) experience delayed growth, significant hypotonia (low muscle tone), and feeding issues. It does effect circadian rhythms in mice models.

SNORD116, often referred to as HBII-85, is a non-coding RNA (ncRNA) molecule that contributes to the alteration of other small nuclear RNAs (snRNAs). Unlike the majority of other snoRNAs, SNORD116 is not significantly complementary to ribosomal RNA and is expressed widely in the brain (but not in PWS patients).

According to the studies, SNORD116 cause sleep defect in patients with Prader-Willi syndrome. Same observation was seen in mouse models too. Paternal expression of SNORD116 is thought to be a potential gene for the sleep disruptions/circadian rhythm’s that the majority of PWS sufferers.

To learn more about circadian rhythm click here

brainly.com/question/6434404

#SPJ4

3 0
1 year ago
How might the management of nonrenewable resources be different fron the management of renewable resources?
Elden [556K]

Nonrenewable resources and found it fixed amount hence not managing properly will lead to full use of it and cannot be replaced

Explanation:

  • Nonrenewable resources are found in the ground and they are the natural resources created by nature
  • It includes fossil fuels, like natural gases, oil, coal, etc and also the minerals used for making metals
  • These natural resources have taken more than human's life span to form, up to million years. Hence, replacing of these natural resources are not possible
  • Renewable natural resources are trees, water, air. These resources can be recycled and they are also circulating in the atmosphere in the form of a cycle.
  • Hence, nonrenewable resources should be managed properly for it last for the coming generations.

3 0
3 years ago
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