Which statement is correct about diffusion?

It's a passive process which molecules move from a region of higher to lower concentration.

It's very rapid over long distances.

It requires an energy expenditure by the cell.

It's an active process where molecules move from a region of lower to higher concentration.

In biological membranes, the phospholipids are arranged in a _______, with the_______.

bilayer; fatty acids pointing toward each other

bilayer; fatty acids facing outward

single layer; fatty acids facing the interior of the cell

single layer; phosphorus-containing region facing the interior of the cell

The plasma membranes of winter wheat are able to remain fluid when it is extremely cold by

replacing saturated fatty acids with unsaturated fatty acids

synthesizing new forms of cholesterol

decreasing the number of hydrophobic proteins present

Which statement about cholesterol molecules is true?

They alter the fluidity of the membrane.

They help hold a membrane together.

They disrupt membrane function.

The difference between osmosis and diffusion is that

osmosis refers specifically to the movement of water, whereas diffusion refers to the movement of any type of molecules

diffusion is passive transport, whereas osmosis is active transport

only in diffusion do molecules move from areas of high concentration to areas of low concentration

osmosis is the opposite of diffusion and only involves the movement of water

If aquaporins are injected into the membranes of epithelial cells that line blood vessels,

the membranes will become more permeable to water

the flow of Na+ through aquaporins will increase

the intracellular concentration of K+ will increase

the electrical properties of the cells will be altered

Which way would the purple molecules move through the semi-permeable membrane?

none of the purple molecules would move

they would move equally back and forth in a state of dynamic equilibrium

Which of the following supports the Endosymbiotic Theory?

mitochondria contain their own DNA and ribosomes

cells produce their own proteins

glycolysis is common to all cells

chloroplasts developed from enfoldings of the cell membrane

A cell with a predominance of free ribosomes is most likely

producing primarily cytoplasmic proteins.

constructing an extensive cell wall or extracellular matrix.

digesting large food particles.

Motor proteins provide for molecular motion in cells by interacting with what types of cellular structures?

cellulose fibers in the cell wall

sites of energy production in cellular respiration

Which of the following contain the 9 + 2 arrangement of microtubules, consisting of nine doublets of microtubules surrounding a pair of single microtubules?

both motile cilia and primary (nonmotile) cilia

both centrioles and basal bodies

Cells 2

Biology

11th - 12th Grade

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

What do the brown structures represent?

Phospholipids

Glycoproteins

Channel Proteins

Cyctoskeleton Filaments

What is the name for a molecule that has a polar head region and a hydrophobic tail region?

Bihydrophicity

Amphipathic

Hydrophilic

Dipolarity

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What molecule plays and important role in controlling cell membrane fluidity?

Insulin

Testosterone

Triglyceride

Cholesterol

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What extracellular molecules aid in cell recognition and cell to cell binding?

Glycoproteins

Glycolipids

Proteoglycans

All of the above

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following types of transport requires energy?

Passive

Active

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following factors does NOT determine the speed of diffusion?

Temperature

Diameter

Concentration Gradients

Osmosis is the movement of __________ across a membrane?

Glucose

Water

N⁺ions

Hydrogen Peroxide

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Cells 2

What do the brown structures represent?

What is the name for a molecule that has a polar head region and a hydrophobic tail region?

What molecule plays and important role in controlling cell membrane fluidity?

What extracellular molecules aid in cell recognition and cell to cell binding?

Which of the following types of transport requires energy?

Which of the following factors does NOT determine the speed of diffusion?

Osmosis is the movement of __________ across a membrane?

The cell that is pictured here in is what type of solution?

Which statement is correct about diffusion?

What is the function of the Golgi Apparatus?

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