Why does soap dissolve the membrane easily

Which is NOT a key abiotic factor in marine ecosystems?

Ivenika [448]

The correct answer for the question that is being presented above is this one: "d. amount of plankton." The key abiotic factor in marin ecosystems includes the water temperature, the amount of sunlight and the water depth. The amount of plankton is not really an issue.

4 0

4 years ago

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Diferencia entre estimulo y receptor

Archy [21]

Explanation:

Un estimulo es cualquier cambio que es capaz de producir una respuesta por parte del organismo. Los receptores son estructuras muy especializadas capaces de percibir los estímulos y convertirlos en impulsos nerviosos

7 0

3 years ago

Why do resistant bacteria multiply faster after a patient has taken antibiotics compared to a healthy person who has not taken a

Alenkasestr [34]

Answer:

When patient takes in antibiotics the resistance bacteria gets a competitive survival advantage over the normal sensitive bacteria and hence grows faster.

Explanation:

Bacteria can acquire resistance by taking in plasmids containing MDR (Multi-Drug Resistance) gene cassettes. The MDR genes produces proteins that can:

Render the antibiotic ineffective to act on its target by inducing chemical modifications on the drug.
Promote efflux of the drug from the bacterial cell so that the drug cannot act upon its target.

When a healthy person ( having no prior exposure to the antibiotic) is infected by bacteria ( both sensitive and resistant varieties):

A competition develops for the host cells and nutrients between the sensitive and the resistant variety.
This mutual competition restricts either of the sensitive or resistant bacterial strain to grow profusely.

When a person (having prior antibiotic exposure), gets infected by bacteria ( both sensitive and resistant varieties) and is exposed to the same antibiotic:

The sensitive variety, due to its sensitivity towards the drug, gets killed.
The resistant variety, due to its MDR genes, bypasses the lethal effect of the drug and survives.
These surviving resistant bacteria can now infect all the available host cells and utilise all the available nutrients without facing any competition and multiply rapidly.

4 0

4 years ago

Which of these can RAPIDLY pass directly through the phospholipids of the plasma membrane, without the help of a transport prote

NISA [10]

Answer:

The correct answer is - A only.

Explanation:

The phospholipid membrane that is hydrophobic layer which permits movement of the molecules with the help of various transport protein or carrier proteins only if they are large or hydrophilic in nature such as water, however small molecules like hydrophobic molecules like lipids move through phospholipid by simple diffusion.

Rapid movement of the lipid is not need specific transport protein to cross phospholipid of the plasma membrane because of their hydrophobic nature. It also allows rapid movement in transport of the CO2 and Oxygen.

Thus, the correct answer is - A only.

8 0

3 years ago

Dylan is on a strict vegan diet. He doesn’t consume meat, fish, eggs, or dairy products.

serg [7]

Answer:

Option C , vitamin B12

Explanation:

The major source of B12 vitamin is are fish, eggs, milk, and milk products, meat, poultry etc. Hence, if a person starts to take completely vegan diet he/she will not get vitamin B12.

Rest all vitamins can be obtained from vegan diet

Vitamin A can be obtained from - Orange & yellow vegetables, fruits, broccoli, spinach, and dark green, leafy vegetables.

vitamin B3 - Can be obtained from green leafy vegetables, coffee, and tea

Vitamin C - Can be obtained from kiwi, lemon, guava, grapefruit, and vegetables

Vitamin E - Can be obtained from nuts, such as almonds, peanuts and hazelnuts, and vegetable

5 0

3 years ago

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