What is the definition of selective permeability?

• It is the property of the plasma membrane that allows it to control movement of substances into or out of the cell.

• It is the polar heads facing outside of cells.

• It moves needed substances or waste materials out of the plasma membrane.

Tags

NGSS.MS-LS1-2

Which explains how the inside of a cell remains separate from its environment?

• Through the selective permeability of the plasma membrane

• Through active transport processes of the transport proteins

• Due to presence of the membrane bound organelles

• By building a Clash Royale-style defensive structure.

______________________ is a property of the plasma membrane that allows it to control what enters and leaves the cell.

• Selective Permeability

• Part of Life

• Cholesterol

• Cell

What is homeostasis?

• the process of maintaining balance in an organism’s internal environment

• a membrane which allows some substances to pass through while keeping others out

• the ability to move needed substances or waste materials through the plasma membrane

• the ability to arrange phospholipids in a way that allows the plasma membrane to tolerate the watery environment

Tags

NGSS.HS-LS1-3

Which situation would increase the fluidity of a phospholipid bilayer?

• decreasing the temperature

• increasing the number of proteins

• increasing the number of cholesterol molecules

• increasing the number of unsaturated fatty acids

Which of the following statements accurately describes the phospholipid bilayer?

• • It is composed of two layers of phospholipids arranged to allow the membrane to exist in a watery environment.

• it consists of a single layer of phospholipids.

• It consists of proteins only, without any lipid component

• It is composed of cholesterol only, without any protein component.

Polar heads face ​ (a)   the cell and they are ​ (b)   , while nonpolar tails face ​ (c)   the cell which are ​ (d)  

• outside
• hydrophilic
• inside
• hydrophobic

____________________ move substances and wastes through the membrane.

• Cholesterol

• Transport proteins

• Carbohydrates

• Transformers

______________ define the cell’s characteristics and help cells identify chemical signals.

• Carbohydrates

• Cholesterol

• Proteins

• Plasma membrane