When the facilitated diffusion necessary

Biology

2 answers:

Vlad1618 [11]2 years ago

8 0

Answer:

When the molecules size are large, and they are insoluble in lipids, at this time facilitated diffusion is necessary to transport such molecules across the plasma membrane.

Explanation:

Facilitated diffusion is one type of passive transport. It occurs from higher concentration to lower concentration. This diffusion depends on the size of the particle, the solubility of the membrane. The smaller size particles can move faster across the membrane but the bigger particles can't pass the plasma membrane. Another fact is the entire plasma membrane is made up of lipids. It can't allow the lipid insoluble particles to the membrane. For this, there is a special facility to carry such polar molecules like water, such as channels, carrier proteins, porins. These channels facilitate the bigger polar molecules to enter into the membrane and cross the membrane. The enzymes like permease act as channel proteins that bind with the bigger particles and carry them through the channels. This type of diffusion also needs ATP like passive diffusion.

andrey2020 [161]2 years ago

7 0

In biology, diffusion is the movement of substances with the concentration gradient, which means they move from an area of high concentration to an area of low concentration. Facilitated diffusion is diffusion that is performed with the help of a carrier protein that can move particles of the substance.

You might be interested in

A condition in the environment that can restrict a population's growth is

Anika [276]

Limiting factors are resources or other factors in the environment that can lower the population growth rate. Limiting factors include a low food supply and lack of space. Limiting factors can lower birth rates, increase death rates, or lead to emigration.

3 0

1 year ago

PLEASE HELP EMERGENCY!! IF YOU ARE NOT 100% SURE ABOUT YOUR ANSWER DO NOT ANSWER THEN!! PLEASE!!

valina [46]

Answer:

cellular respiration

Explanation:

100% sure photosynthesis is for plants

6 0

2 years ago

Read 2 more answers

While Maria's mom has small ears (alleles ee), her dad has large ears (alleles EE). What are the possible phenotypes Maria would

Svetach [21]

The only possible phenotype is large ears.

This is because using a punnet square reveals that each option has a dominant allele of large ears, leaving no room for the recessive trait of small ears.

Hope this helps!

7 0

2 years ago

Natural selection is based on the idea that as an environment changes, an individual's genetic makeup will change suddenly to su

Schach [20]

No. The natural selection is when the best suit fits survive. Therefore is not the idea that as an environment changes.

7 0

2 years ago

In a study published in the journal Nature, scientists studied eight ponds in Florida: four that were populated by a species of

AlexFokin [52]

Answer: the rate of pollination of flower, in a field next to a pond with no fish, will DECREASE.

Explanation:

POLLINATION is defined as the process by which flowering plants, through the aid of external agents such as insects,wind, water and other animals, are able to transfer pollen grains from an anther to a receptive stigma. Insects are the most common pollinators. They visit flowers to obtain nectar and pollen as source of food. Flowers use various features, such as colour and scent, to attract and guide insects to the food source within them. In the process of reaching their source of food, insects bring about pollination.

From the study conducted by scientist in Florida, eight(8) ponds where subjected to the the study. The first four (4) ponds had species of fishes that fed on dragonflies and dragonfly larvae, hence the reason for a decrease in the population of the dragon flies in the area around it. While the remaining four (4) ponds had NO fish and the area around it is populated with dragonflies and dragonfly larvae. This is so because of the absence of fish.

It was then noted that the dragon lies fed of the insect pollinators such as the bees and butterflies. Since these dragonflies and its larvae are abundant in the field which is close to the pond with no fish, they will grossly depend on the insect pollinators as their source of food thereby decreasing the rate of pollination in the field next to the pond with no fish.

7 0

2 years ago