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IrinaK [193]
3 years ago
13

Which of the follwing is a characteristic of cancerous cells?

Biology
1 answer:
ohaa [14]3 years ago
3 0

Answer:

D

Explanation:

Cancer cells exhibit uncontrolled and disorganized growth. Formation of new blood vessels is required to bring nutrients and oxygen to cancerous tumors. Cancer cells cannot enter the cell cycle and therefore are mortal. cancer cells enter the cell cycle repeatedly, and in this way they are immortal.

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A scientific law is?
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The answer is D. Always true in all places
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When a cell gains water, what happens to its size and weight?
SIZIF [17.4K]
The water gets inside the cell and it looks like its going to burst...the weight will be heavier 
7 0
3 years ago
The answer is 51.0 ml but can someone explain why please
professor190 [17]

Answer:

\boxed{\sf A. \ 51 \ mL}

Explanation:

Amount of water displaced by the sphere will be equal to the volume of complete sphere.

As the sphere completely sinks to the bottom of the cup.

We have been given;

Diameter of sphere (d) = 4.6 cm

So,

\sf Radius \:  of \:  sphere  \: (r) =  \frac{Diameter \:  of \:  sphere \: (d)}{2}  \\  \sf =  \frac{4.6}{2}  \\ \sf  = 2.3 \: cm

Volume of sphere (V):

\boxed{ \bold{V =  \frac{4}{3} \pi {r}^{3} }}

By substituting value of r we get:

\sf \implies V =  \frac{4}{3}  \times \pi \times  {(2.3)}^{3}  \\  \\  \sf \implies V =  \frac{4}{3}  \times 3.14 \times 12.167 \\  \\ \sf \implies V =    \frac{152.81752}{3} \\  \\   \sf \implies V =  50.94 \:  {cm}^{3}  \\  \\   \sf \implies V  \approx 51 \:  {cm}^{ 3}

1 cm³ = 1 mL

\therefore

V = 51 mL

So,

Water displaced by the sphere = 51 mL

6 0
3 years ago
(04.04 LC)
podryga [215]

Answer:

A) The production of energy without the presence of oxygen  - Anaerobic respiration

B) The chemical breakdown of a substance  - Fermentation

C) The breakdown of food to create energy in the presence of oxygen  - Aerobic respiration

D) An organic molecule that occurs as an intermediate in many metabolic processes - Pyruvate

Explanation:

A) Anaerobic respiration is a type of cellular energy production that occurs in the absence of oxygen. it is much less efficient than aerobic respiration (see question C). In cellular respiration, cells produce ATP, which is the "currency" of energy in the cell, by breaking down glucose. ATP is required to carry out the normal functions of a cell.

As it is much less efficient than aerobic respiration, it produces much less ATP. However, when there is no oxygen, it is the only choice. An example is when muscle cells are working very hard and use up all the oxygen in the tissue. To keep producing some energy, they undergo anaerobic respiration, which only produces 2 molecules of ATP for every molecule of glucose.

B) In respiration, Fermentation is a pathway of breaking down glucose into chemical energy that occurs in the absence of oxygen. Anaerobic respiration can lead to two types of fermentation, lactic acid fermentation (described above) and ethanol fermentation which is another type of anaerobic respiration in which fungi (such as yeast) break down glucose into ethanol, producing 2 molecules of ATP carbon dioxide as a by-product. This is how we make bread and beer!

C) Aerobic respiration is cellular respiration in the presence of oxygen. It creates a net gain of 36 molecules of ATP, compared to the 2 ATPs created without oxygen. This is because in aerobic respiration, the oxygen acts as a final electron acceptor for the electron transport chain. In its absence the electron transport chain cannot proceed. The electron transport chain is how cells generate most of their chemical energy.

D) Pyruvate is an important molecule in the process of respiration. Both aerobic and anaerobic respiration begin with the same process, glycolysis. Glycolysis is the process by which 1 molecule of glucose is broken down into two molecules of pyruvate - a metabolic intermediate. This releases 2 molecules of ATP. In the presence of oxygen, pyruvate is oxidised and enters the Krebs cycle, which makes a series of compounds that donate electrons to the electron transport chain, which produces extra ATPs through oxidative phosphorylation.

In the absence of oxygen, pyruvate is converted either to lactic acid or ethanol by fermentation

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3 years ago
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Yakvenalex [24]
Smoking ruins your lungs making it harder to breath and get oxygen
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smokers get less so it is harder for them, its like trying to exercise while breathing through a sponge or a straw os
5 0
3 years ago
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