BIOL 1001 : Biology Notes Exam 3

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azuremammoth471

15 Mar 2019

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Red blood cell wants" to be in an isotonic environment. To do this it must control its internal environment: must control the concentration of solute in the cell. Isotonic is an equal concentration of solute compared to the inside of the cell. Hypertonic is a greater concentration of solute than inside of a cell( (higher outside) Hypotonic is a lower concentration of a solute than the inside of a cell (lower outside) More is going in than is coming out. *when water is scarce, the central vacuole shrinks and the cell wall is not supported. Water is trying to rush in. as this happens, the cell is swelling. I starts exerting pressure as water tries to get in. (osmotic pressure) *perfect situation for plant. Pressure against the cell wall gives stability, allows plant to stand up. Water is higher in lower solute, so it moves. 2 f 4 f cl k f can move.

Related Questions

Which is the only substance involved in osmosis?

alcohol

salt

sugar

water

If a solution outside of a cell has a lower concentration of solutes inside of a cell, it is referred to as what?

hypotonic

facilitated

hypertonic

isotonic

In an electron microscope, what type of cells are used?

dead, but fresh cells

live and fresh cells

dead, processed cells

live, processed cells

Which model best describes the observations and functions of the plasma membrane?

phospholipid bilayer

cell membrane

fluid mosaic model

nuclear envelope

1,Match the descriptions to the type of transport.

- A. B. C.	Water enters a cell because it is hypertonic compared to the extracellular environment, increasing its turgor pressure
- A. B. C.	Water enters guard cells because the guard cells are hypertonic compared to the surrounding cells
- A. B. C.	Potassium ions are pumped into guard cells
- A. B. C.	The motor cells of a Venus fly trap are hypotonic compared to surrounding cells, causing water to leave the motor cells
- A. B. C.	Sugar is loaded into the phloem

A.	Both active and passive transport
B.	Passive Transport
C.	Active transport

2,Describe what is wrong with the following statement and explain why:

All prokaryotic and eukaryotic cells contain plasma membrane, nucleus, ribosomes, organelles, cytoplasm, and cell walls.

What is short-distance transport?

	a,	The movement of solutes from a region of low concentration to a region of high concentration
		b,The movement of water, nutrients, and other substances between cells
c,		The movement of substances from a region of high concentration to a region of low concentration
d,		The movement of water across a semipermeable membrane from a region of low solute concentration to a region of high solute concentration.

What terms describe the movement of water across a semipermeable membrane from a region of high water concentration towards a region of low water concentration (and high solute concentration.)

What is found in the proptoplasm?

Cell wall, cytoplasm, plasma membrane, nucleus, and other cell organelles

Plasmodesmata, cell wall, and plasma membrane

Cell wall, cytoplasm, and plasma membrane

Cytoplasm, nucleus, and other cell organelles

The channels that allow nutrients and protoplasm to pass between plant cells are called _________________.

What happens when a plant cell is placed in a hypotonic solution?

Water will enter the plant cell and the plasma membrane will swell and cell lysis will occur

Water will leave the plant cell and the plasma membrane will pull away from the cell and plasmolysis will occur

Water will enter the plant cell and the plasma membrane will swell and push against the cell wall

Water will leave the plant cell and the plant cell will lose turgor pressure, causing the plant to wilt

________________ transport uses cellular energy.

What molecules make plasma cell membranes hydrophilic on the outside and hydrophobic on the inside?

What type of cells do plants have?

		Bacterial
		Archaeic
		Eukaryotic
		Prokaryotic

A hypertonic solution has a higher level of solutes so the water moves out of the cells to the surroundings

A hypotonic solution has a higher level of solutes so the water moves out of the cells to the surroundings

The salt and water solution in the potato is a hypotonic solution

Osmosis is the movement of large molecules across a membrane which require embedded proteins

The plain water in this experiment is the solvent and the salt is the solute.

Passive transport requires no energy and the molecules move with the concentration gradient or from high concentration to low concentration

Active transport required no energy and the molecules move with the concentration gradient or from high concentration to low concentration.

The water on the inside of the potato with the salt molecules is an isotonic solution the same as the solution on the outside of the potato.

Water will not move by simple diffusion (osmosis) into or out of cells it requires energy or protein transporters

The solution of salt water in the potato has a lower concentration of water molecules so the water on the outside should move into the cells

BIOL 1001 : Biology Notes Exam 3

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