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SVEN [57.7K]
3 years ago
7

Cells must be alive to use energy and do work dose passive transport occur in a cell that is dead? Why or why not?

Biology
1 answer:
Orlov [11]3 years ago
6 0

Answer:

<h3>Yes, Passive transport can occur in dead cells.</h3>

Explanation:

For passive transport to occur, a concentration gradient has to be formed across a permeable or semi-permeable membrane. If the cell membrane of the dead cell, which is a semipermeable membrane, is intact and a concentration gradient has formed on both sides, passive transport can occur.

A concentration gradient is the difference in the concentration of solute molecules  across the membrane. Passive transport will allow solute molecules to travel from the higher concentration of the solute to the lower concentration across a membrane till equilibrium is reached, that is, both the sides of the membrane has equal concentration of the solute.

The transport of the solvent can occur as well, from higher concentration to lower concentration.  

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compare and contrast the processes of photosynthesis and aerobic respiration. how are they similar and how do they differ?
Brut [27]

Answer:

Explanation:

Photosynthesis and cellular respiration (aerobic) are both metabolic processes that occur in specialized organnelles of living cells. These two processes are so unique to one another in the sense that one uses the product of the other as a reactant and vice versa.

Photosynthesis is an anabolic reaction that occurs in the Chloroplast of autotrophs in which captured energy from sun is used to synthesize organic food (glucose) by combining carbondioxide (CO2) and water. Oxygen is released in this photosynthetic process.

6CO2 + 6H20 --------> C6H12O6 + 6O2

Aerobic cellular respiration, on the other hand, is a catabolic process undergone by every aerobic living cell (in the mitochondria) in which glucose is broken down in the presence of oxygen to produce ATP (energy) releasing CO2 and water (H2O) in the process.

C6H12O6 + 6O2 ------> 6C02 + 6H2O

One spectacular difference is that photosynthesis uses solar energy (from sun) while aerobic cellular respiration uses chemical energy to power the process.

8 0
3 years ago
How do scientists use the kinetic theory of matter?
Keith_Richards [23]

The energy of moving matter is called kinetic energy. Scientists think that the particles of all matter are in constant motion. In other words, the particles of matter have kinetic energy. The theory that all matter consists of constantly moving particles is called the kinetic theory of matter. 

  • If particles do not have enough kinetic energy to overcome the force of attraction between them, matter exists as a solid.
  • If particles have enough kinetic energy to partly overcome the force of attraction between them, matter exists as a liquid.
  • If particles have enough kinetic energy to completely overcome the force of attraction between them, matter exists as a gas.

3 0
3 years ago
Read 2 more answers
1.) A person walks 12.5 km in 1.9 h. What is the person's<br> average velocity in km/h and m/s?
Artemon [7]

Answer:

1. 6.56 km/hr

2. 1.83 m/s

Explanation:

The average velocity/speed can be calculated using the formula;

Average speed/velocity = distance/time

According to the information provided in the question, distance = 12.5km, time = 1.9h

Average velocity in km/hr = 12.5/1.9

= 6.578

= 6.56km/hr

However, in order to calculate the average speed in m/s, we have to convert distance in km to m, and time in hour to seconds.

1km = 1000m

12.5km = 12.5 × 1000

= 12500m

1 hour = 3600seconds

1.9hours = 1.9 × 3600

= 6840seconds

Average velocity = 12500/6840

= 1.827

= 1.83m/s

7 0
3 years ago
A species of beetle expresses a pigment protein as an adult but not as a juvenile. The pigment is encoded by the gene PIG. A pro
Deffense [45]

Answer:

The KID protein is responsible for the no pigmentation at the juvenile stage. When the KID protein inhibits in the adult state, the pigmentation occurs in the body. This might occur because the KID protein acts as the repressor molecule and acts as a negative regulator of PIG protein.

The KID protein is responsible for pigmentation an adult stage.  Any mutation in the KID gene might result in the loss of pigmentation in the adult. The KID gene is responsible for the binding of the KID protein and mutation in this gene can lead to the arrest of KID protein. The protein is unable to release and PIG continuously repressed in the adults.

8 0
3 years ago
What is the carbon cycle? How does carbon get into our atmosphere? How does it leave?
Ray Of Light [21]
When carbon is exchanged along the biosphere
6 0
3 years ago
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