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serious [3.7K]
3 years ago
13

Cells need to bring in molecules to carry out cellular processes. Often, this requires moving the molecules across the cell memb

rane against the concentration gradient. How do these molecules get into the cell?A. passive transport by diffusionB. active transport using ATPC. passive transport by osmosisD. phagocytosis
Biology
1 answer:
aniked [119]3 years ago
5 0

Answer:

B (active transport using ATP)

Explanation:

Movement of substances normally occur in the direction of concentration gradient/difference i.e. the difference in concentration of a substance across a membrane. Letting molecules diffuse or pass down their concentration gradient does not require energy but pumping those molecules against gradient requires energy in form of Adenosine triphosphate (ATP). This process is called Active transport.

In order to perform certain cellular processes, cells need to move substances from their surroundings into the cell across their cell membrane. Moving this substances against the concentration gradient between the cell membrane and its extracellular fluid requires energy (ATP).

An example is the sodium-pottasium pump employed by animal cells in which they expend energy to move K+ molecules into the cell and Na+ molecules outside the cell against the concentration gradient of their cell membrane and extracellular solution.

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What do you mean? What species?
5 0
3 years ago
State which enzyme probably camr from the stomach of the mondoni
svetlana [45]

Hi,

I browsed through internet about the enzymes and found that there is an exercise with a list of three enzymes and probably you want to know, which are the enzymes that came from the stomach of Mondoni-a little mammal organism.

Please see the graphs i found, they contain the pH and temperature of the enzymes. So, we need to find the enzymes of Mondoni on the basis of these pH and temperature values.

The enzymes that came from Mondoni's stomach are A and B. These enzymes performed well at low pH and this indicates that they are probably digestive enzymes and have acidic nature.

Moreover, enzyme A and B perform better in low temperature and performed worst in extreme temperature like 80 degree Celsius. Their temperature range also matches with the temperature of mammals, therefore enzyme A and B came from Mandoni.

Hope it helps! :)

8 0
3 years ago
What happens to the carbon dioxide (CO2) levels of a plant when it does or does not have light?
zubka84 [21]

Explanation:

Carbon dioxide is needed for photosynthesis, but oxygen is needed for cellular respiration. Assuming there is still oxygen then the plants will produce carbon dioxide and some of it will be reabsorbed by photosynthesis during daylight. However, ultimately there wouldn’t be enough carbon dioxide for the plants to grow and they will start to die. Some plants have evolved a C4C4 photosynthesis pathway so they only require a small amount of CO2CO2 to survive, however they do still require more than zero CO2CO2.

So basically you killed off all the plants and all the other non-microbial life died of starvation shortly afterward.

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8 0
2 years ago
Thylakoids membranes have special proteins in bedded into the membrane which catalyze the production of ATP from what type of io
djyliett [7]

Answer:

From Hydrogen ion.

H+

Explanation:

It's is from hydrogen ion because majoroty of the electrons transport processes take place in the thylakoids membranes in a bid to produced ATP, Hydrogen ion is allow to move through thylakoid space and then backflow through the proteins embedded in the thylakoids membrane called ATP synthase, which produce ATP from ADP in the mitochondrial matrix and chloroplast stroma.

7 0
2 years ago
The activity of bacterial glutamine synthetase isI. inhibited by glutamineII. inhibited by adenylylationIII. activated by uridyl
Andreas93 [3]

Answer: Option II. inhibited by adenylylation.

Option III. activated by uridylylation of the PII subunit of adenylyltransferase.

Explanation:

Glutamine syntherase is an enzyme that is found in the mitochondria. Glutamine syntherase acts as a catalyst in the reaction that produces glutamine from glutamate and ammonia.

6 0
3 years ago
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