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Ivan
3 years ago
5

Cuales son las formas de las células

Biology
1 answer:
xeze [42]3 years ago
8 0

Respuesta:

Por lo general, las células son redondas, alargadas o esféricas. También hay algunas celdas que son largas y puntiagudas en ambos extremos. Estas células presentan forma de huso. En algunos casos, las celdas son muy largas.

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The Maine Department of Transportation (DOT) has a fleet of roughly 400 plow trucks that are used to control snow and ice on app
Free_Kalibri [48]

Answer:

it is 736

Explanation:

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7 0
2 years ago
One natural cause of extinction would be the massive __________ that occurred in the 1800s.
Aleks [24]
Earth's history. In the worst one, 250 million years ago, 96 percent of marine species and 70 percent of land species died off. It took millions of years to recover.

6 0
2 years ago
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Select all of the statements that describe the electron transport chain of E. coli. Multiple select question. It has three diffe
deff fn [24]

Answer:

It adjusts to different oxygen levels.

The cytochrome bo branch operates when E coli is growing rapidly with good aeration.

The cytochrome bd branch operates at low oxygen conditions. It is located in the outer membrane.

Explanation:

Electron transport chains of Escherichia coli are composed of different dehydrogenase and terminal reductase which is linked by quinones. It adjusts to different oxygen level because Oxygen is preferred electron acceptor and represses the terminal reductase of anaerobic.

5 0
2 years ago
Cite particularly the difference in the synthesis of the two biomolecules in animals and plants.
Sonja [21]

Answer:

The preceding section reviewed the major metabolic reactions by which the cell obtains and stores energy in the form of ATP. This metabolic energy is then used to accomplish various tasks, including the synthesis of macromolecules and other cell constituents. Thus, energy derived from the breakdown of organic molecules (catabolism) is used to drive the synthesis of other required components of the cell. Most catabolic pathways involve the oxidation of organic molecules coupled to the generation of both energy (ATP) and reducing power (NADH). In contrast, biosynthetic (anabolic) pathways generally involve the use of both ATP and reducing power (usually in the form of NADPH) for the production of new organic compounds. One major biosynthetic pathway, the synthesis of carbohydrates from CO2 and H2O during the dark reactions of photosynthesis, was discussed in the preceding section. Additional pathways leading to the biosynthesis of major cellular constituents (carbohydrates, lipids, proteins, and nucleic acids) are reviewed in the sections that follow.

Go to:

Carbohydrates

In addition to being obtained directly from food or generated by photosynthesis, glucose can be synthesized from other organic molecules. In animal cells, glucose synthesis (gluconeogenesis) usually starts with lactate (produced by anaerobic glycolysis), amino acids (derived from the breakdown of proteins), or glycerol (produced by the breakdown of lipids). Plants (but not animals) are also able to synthesize glucose from fatty acids—a process that is particularly important during the germination of seeds, when energy stored as fats must be converted to carbohydrates to support growth of the plant. In both animal and plant cells, simple sugars are polymerized and stored as polysaccharides.

Gluconeogenesis involves the conversion of pyruvate to glucose—essentially the reverse of glycolysis. However, as discussed earlier, the glycolytic conversion of glucose to pyruvate is an energy-yielding pathway, generating two molecules each of ATP and NADH. Although some reactions of glycolysis are readily reversible, others will proceed only in the direction of glucose breakdown, because they are associated with a large decrease in free energy. These energetically favorable reactions of glycolysis are bypassed during gluconeogenesis by other reactions (catalyzed by different enzymes) that are coupled to the expenditure of ATP and NADH in order to drive them in the direction of glucose synthesis. Overall, the generation of glucose from two molecules of pyruvate requires four molecules of ATP, two of GTP, and two of NADH. This process is considerably more costly than the simple reversal of glycolysis (which would require two molecules of ATP and two of NADH), illustrating the additional energy required to drive the pathway in the direction of biosynthesis.

4 0
2 years ago
Which of these is NOT a way that large molecules, like glucose, can enter a cell?
WITCHER [35]
Hello There! ^_^

Your question: Which of these is NOT a way that large molecules, like glucose, can enter a cell..?

Your answer: Diffusion through the cell membrane is not a way that the large molecules, like glucose, can enter a cell.

The answer is option A.

Happy Studying! =)




7 0
3 years ago
Read 2 more answers
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