Bio 2 Unit 2 Test

The first mosaic model describes the plasma membrane as consisting of what?

Membrane phospholipids _____________.

The cholesertrol associated with animal cell membranes ____________.

Most of the function of a cell membrane, including transport and enzymatic fucntion are _______.

Which of the following statements regarding membrane protein function is false? A. Membrane proteins serve as enzymes B. Membrane proteins produce phospholipids C. Membrane proteins form junctions between cells D. Membrane proteins act as receptors to molecules like hormones

Which of the following statements regarding membrane function is false? A. The plasma membrane is the control center of the cell B. The plasma membrane plays a role in transferring signals to the cells interior C. The plasma membrane has receptors for chemical messages D. The plasma membrane forms a selective barrier around the cell

Which proteins allows specific ions or molecules to enter or exit the cell?

Which type of proteins binds with a ligand?

Which type of proteins serve as ID tags and aid in cell to cell recognition?

Which type of proteins help support the membrane and can coordinate external and internal changes?

Fluid Mosaic Model

Know components of plasma membrane

What is the importance of cholesterol?

attachment proteins

Transport proteins

Glycoproteins

Enzymes

Junction Proteins

Receptor proteins

Passive Transport

Concentration Gradient

Which types of molecules will passively transport?

Tonicity

Hypertonic

Hypotonic

Isotonic

Animal Cells optimal solution type

Plant Cells optimal solution type

Diffusion

Aquaporins

Osmosis

Facilitated diffusion

Active Transport

Energy Source

Endocytosis

Exocytosis

Three types of endocytosis:

Phagocytosis

Pinocytosis

Receptor-mediated

Role that endocytosis has on surface area of cell membrane?

Role that exocytosis has on surface area of cell membrane?

Which types of molecules will actively transport?

How would fatty acids get through the membrane and why?

Lysed

What molecules are responsible in phospholipid bilayer for cellular transport

Which statements about the fluid mosaic structure of a membrane are correct? Select the three correct statements. 1 The framework of a membrane is a bilayer of phospholipids with their hydrophilic heads facing the aqueous environment inside and outside of the cell and their hydrophobic tails clustered in the center. 2 The diverse proteins found in and attached to membranes perform many important functions. 3 The kinky tails of some proteins help keep the membrane fluid by preventing the component molecules from packing solidly together. 4 Membranes include a mosaic, or mix, of carbohydrates embedded in a phospholipid bilayer. 5 Because membranes are fluid, membrane proteins and phospholipids can drift about in the membrane.

In the fluid mosaic model, where are the kinky tails?

You are working on a team that is designing a new drug. In order for this drug to work, it must enter the cytoplasm of specific target cells. Which of the following would be a factor that determines whether the molecule enters the cell? A) blood or tissue type of the patient B) non-polarity of the drug molecule C) lack of charge on the drug molecule D) similarity of the drug molecule to other molecules transported by the target cells E) lipid composition of the target cells? plasma membrane

In the figure below, working from the inside out, what would be the order of components observed?

When molecules move down their concentration gradient, they move from where they are ____________ to where they are ________________.

Diffusion across a biological membrane is called ______________________.

In active transport, _____________________.

A molecule moves down its concentration gradient using a transport protein in the plasma membrane. This is an example of __________________.

Water crosses the plasma membrane.

The sodium-potassium pump uses energy from ATP to move sodium ions out of the cell, and potassium ions into the cell. This is an example of ________________.

The plasma membrane forms a pocket that pinches inward, forming a vesicle that contains material from outside the cell. This describes the process of __________.

What name is given to the process by which water crosses a selectively permeable membrane?

Osmosis is often viewed incorrectly as a process driven directly by differences in solute concentration across a selectively permeable membrane. What really drives osmosis?

The ideal osmotic environment for an animal cell is a(n) _____________environment.

An animal cell placed in a(n) __________solution will gain water, swell, and possibly burst.

There is a net diffusion of water out of an animal cell when it is placed in a(n) ___________solution.

The ideal osmotic environment for a plant cell is a(n) ________ environment.

A plant cell placed in a(n) _______________solution will lose water and plasmolyze.

A plant cell surrounded by a(n) _____________ solution will be flaccid (limp).

Utah's Great Salt Lake has an average salinity seven times higher than that of the oceans. Very few multicellular organisms live in this harsh environment. An example is the brine shrimp, which must devote a large portion of its metabolic energy to osmoregulation. These brine shrimp must _____.

Cells A and B are the same size and shape, but cell A is metabolically quiet and cell B is actively consuming oxygen. Oxygen will diffuse more quickly into cell _____ because _____.

Facilitated diffusion is a type of _____.

Aquaporins are proteins that facilitate the transport of __________ across the membrane

Which of these statements is TRUE with regard to this animation? A. The cell is not expending energy. B. Potassium ions are transported down their concentration gradient. C. Sodium and potassium ions are transported against their concentration gradients. D. The cell does not expend ATP. E. Sodium ions are transported down their concentration gradient.

Which of the following is a difference between active transport and facilitated diffusion? A. Active transport involves transport proteins, and facilitated diffusion does not. B. Active transport requires the expenditure of cellular energy, and facilitated diffusion does not. C. Facilitated diffusion involves transport proteins, and active transport does not. D. Facilitated diffusion can move solutes against a concentration gradient, and active transport cannot

When in solution, a molecule that moves slowly across an artificial membrane moves rapidly across a plasma membrane. This molecule rapidly enters the cell regardless of whether its concentration is higher inside or outside the cell. Using this information, which transport mechanism is most likely to be responsible for the movement of the molecule across a plasma membrane?

Endocytosis moves materials _____ a cell via _____.

A white blood cell engulfing a bacterium is an example of _____.

A nursing infant is able to obtain disease-fighting antibodies, which are large protein molecules, from its mother's milk. These molecules probably enter the cells lining the baby's digestive tract via __________.