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4 years ago

Describe the various ways in which the plasma membrane permits interactions with the outside environment.

1 answer:

6 0

By interacting with the external environment, if you mean how molecules are transported outside and into the cell then there are 3 main ways of transport.

Passive transport which refers to the movement of molecules into the cell without using any energy. This includes osmosis (movement of water), diffusion (movement of small molecules like salt) and facilitated diffusion which is the movement of large molecules such as glucose via by channels on the plasma membrane.

Note, in diffuson the cell wants equilibrium which means that the cell wants the same ratio of a specific type of molecule compared to the external envionrment. In other words, it's like a a very salty cell becoming less salty because the external envionrment is less salty.

Active transport refers to the movement of molecules against the concentration gradient using energy.

Bulk transport which refers to the movement of molecules that is influenced by the plasma membrane. One of the ways is for the plasma membrane to engulf particles or expel particles. This allows cells to remove waste.
Go look it up on Khan academy.

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What are the precautions that should be token when using a photometer? please help me

Maksim231197 [3]

Answer:

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8.By using the correct wavelength

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1. Do not move or Carry the unit when in use or connected to the mains electricity supply

2. There should be sufficient time for the chimney to cool before handling

3. Do not use acetylene with the flame photometer

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I HOPE THIS WILL HELP AND IF NOT LET ME KNOW

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3 years ago

A biologist counts the number of zebras in a population each year and notices an increase in the zebra population. Which describ

Illusion [34]

When a biologist counts the number of zebras in a population each year and notices an increase in the zebra population, this would be an example "of observation"

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3 years ago

Read 2 more answers

What are three ways that all plants are alike?

Brrunno [24]

Hello TeamFlow, They are all living things, they all need some sort of nutrition, and all plants like fungi, moss, grass etc, have cells. :)

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4 years ago

A single-stranded DNA sequence is attached to a microarray chip, and fluorescently labeled complementary RNA (cRNA) fragments (p

Darya [45]

Answer:

Option A , Genome

Explanation:

Microarrays that contains array of single stranded DNA are used to study thousands of gene expression for all the genes of a genome and are usually termed as DNA miscroarrays. These microarrays being single stranded allows attachment of complementary DNA strand to bind to their surface. The mRNA from the cell is extracted and converted into cDNA which is further used for DNA cloning.

Hence, option A is correct

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3 years ago

Glucose travels in the plasma or liquid part of

djverab [1.8K]

Answer:

Explanation:

Glucose is a sugar, highly soluble in water because it has lots of polar hydroxyl groups (-OH) which can form hydrogen-bonds with water molecules. These types of bonds are intermolecular forces which are present in other macromolecules like the DNA or proteins.

Cholesterol and triglycerids are lipids. These have long chains of hydrocarbons, which are non polar and therefore insoluble in water.

Blood is made of a solid and a liquid part. The solid part contains cells. The liquid part (plasma), is made of water, salts, and proteins. Glucose and cholesterol/triglycerids travel in the liquid part of the blood, in an aqueous environment. Because the lipids are not soluble, they need to travel with a carrier protein that keeps them protected from the surrounding water.

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3 years ago