Mastering Biology Assignment 4

What property of dishwashing liquid (detergent) makes it useful to wash grease from pans?

Amphipathic nature

How can a lipid be distinguished from a sugar?

Lipids are mostly nonpolar.

Which statements about the fluid mosaic structure of a membrane are correct? Select the three correct statements.

The framework, the diverse, because membranes

Which of the following factors does not affect membrane permeability?

The polarity of membrane phospholipids

Which of the following statements about a typical plasma membrane is correct?

The two sides of the plasma membrane have different lipid and protein composition.

In this diagram of the plasma membranes of two adjoining cells, identify the protein indicated by the white arrow, including its function.

a receptor protein that binds with a signaling molecule and relays the message into the cell by activating other molecules inside the cell

Which of these cannot rapidly pass directly through the phospholipids of the plasma membrane?

b,c,d

Which of the following is least likely to be important in holding the components of a biological membrane together?

covalent interactions ,..

True or false? Osmosis is a type of diffusion.

facts

Identify Structure A.

glycoprotein

If a red blood cell is placed in a salt solution and bursts, what is the tonicity of the solution relative to the interior of the cell?

hypotonic

Drag the terms on the left to complete the sentences on the right.

more,less,passive

Which of the following particles could diffuse easily through a cell membrane?

o2

Facilitated diffusion is a type of _______.

passive transport

Identify Structure D.

phospholipid bilayer of membrane

Structure A is a _____.

solute

What is the function of Structure E?

stabilization of the phospholipids

Which of the following would be a factor that determines whether the molecule selectively enters the target cells?

the similarity of the drug molecule to other molecules that are transported into the target cells

The permeability of a biological membrane to a specific polar solute depends primarily on which of the following?

the types of transport proteins in the membrane

Structure A in the figure is a(n) _____.

transport protein

Structure B is a _____.

transport protein

True or false? The water-soluble portion of a phospholipid is the polar head, which generally consists of a glycerol molecule linked to a phosphate group.

truth

Which of the following best describes the structure of a biological membrane?

two layers of phospholipids with proteins either crossing the layers or on the surface of the layers