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chubhunter [2.5K]
3 years ago
6

Which of the following serves as the cell's boundary from its environment

Biology
1 answer:
Bad White [126]3 years ago
4 0
B. Cell membrane
Remember cell membrane is the structure aka “wall of the house” is the clear boundary between the cells internal and external environments:))
Hope this helps
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How was the first enzyme discovered?<br> Please mention the whole process of its discovery.
Licemer1 [7]

Answer:

the year 1812 Gottlieb Sigismund Kirchhoff was investigating the procedure of converting starch into glucose. In his experiment he also enlightens the application of these biomolecules as catalyst [3]. In 1833, French chemist Anselme Payen discovered the first enzyme, diastase [4

Explanation:

by anselem payen

8 0
1 year ago
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
List all four body systems that make up the excretory system and give an example of how each body system eliminates waste.
mart [117]

Answer:

Organs of excretion make up the excretory system.

They include the :

kidneys-Blood by-products are filtered out by the kidneys and leave the body in urine form. They are part of the urinary system, which also includes the ureters, bladder, and urethra

large intestine-By-products enter the intestine and leave the body in the form of feces

liver- breaks down harmful substances. It's by-products are excreted into bile or blood.

skin-Sweating eliminates excess water and salts, as well as a small amount of urea, a byproduct of protein catabolism

lungs- oxygen is exchanged for a waste gas called carbon dioxide. Your bloodstream then carries this waste gas back to the lungs where it is removed from the bloodstream and then exhaled

Hope this helps!!!!!!

Forever friend and helper,

Cammie :)

4 0
3 years ago
If the environment changes quickly and no individual members of a species are able to survive in the new environment, then the s
timofeeve [1]
If the environment changes quickly and no individual members of a species are able to survive in the new environment, then the species will become extinct in that environment 
4 0
3 years ago
Read 2 more answers
F a cell with a very low concentration of oxygen (O2) were to be placed in an environment that has a very high concentration of
vovikov84 [41]

Answer:

the oxygen from the environment will flow into the cell

Explanation:

because by diffusion, areas of high concentration flow to low concentration :)

7 0
2 years ago
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