Biology Chapter 3 Quiz 2

Which of the following processes could result in the net movement of a substance into a cell, if the substance is more concentrated in the cell than in the surroundings?

active transport

On a lab bench, there are four balloons filled with identical volumes of different salt solutions: 0% (balloon A), 5% (balloon B), 10% (balloon C), and 15% (balloon D). There are also four beakers each filled with identical volumes of a 10% salt solution. The balloons are semi-permeable; that is, only water can enter and exit the balloon. All four balloons are placed in separate beakers at the same time and are allowed to come to equilibrium. Which is the correct order of balloon volumes at equilibrium?

A < B < C < D

Which of the following will increase the rate of diffusion?

Increase the concentration of molecules even higher on the high concentration side.

A balloon permeable to water but not to glucose contains a 10% glucose solution. A beaker contains a 5% glucose solution. What will happen when the balloon is submerged in the beaker?

The volume of water in the beaker will decrease.

Diffusion is an example of ________.

Passive Transport

________ are the major lipids of plasma membranes.

Phospholipids

The concept of a membrane as a fluid mosaic reflects the ability of ________.

The phospholipids and embedded proteins can both move around.

A balloon permeable to water but not to glucose contains a 10% glucose solution. A beaker contains a 5% glucose solution. Which of the following is TRUE?

The solution in the balloon is hypertonic relative to the solution in the beaker.

In a hypotonic solution, a plant cell will ________. plasmolysis-the shrinking of the cytoplasm of the cell away from the cell wall due to water loss via osmosis turgid- swelling of a cell, to the point of becoming rigid or inflexible flaccid- neither swollen, nor shrunken

become turgid

Active transport ________.

can involve the transport of ions, can move solutes against their concentration gradient, uses ATP as an energy source

When two solutions that differ in solute concentration are placed on either side of a selectively permeable membrane, and osmosis is allowed to take place, the water will ________.

exhibit a net movement to the side with lower water concentration

Certain cells that line the stomach synthesize a digestive enzyme and secrete it into the stomach. Which of the following processes could be responsible for its secretion?

exocytosis

Examine the cells below. Cells with a higher concentration of ions than the surrounding medium tend to ________.

expand

When mixed with water, phospholipids spontaneously form membranes because they ________.

have hydrophilic phosphate groups that are attracted to water and hydrophobic fatty acid tails that avoid water

Diffusion ________.

occurs when particles spread from areas where they are less concentrated to areas where they are more concentrated

The act of a white blood cell engulfing a bacterium is ________.

phagocytosis

Osmosis can be defined as ________.

the diffusion of water across a selectively permeable membrane

If placed in tap water, an animal cell will undergo lysis, whereas a plant cell will not. What accounts for this difference?(lysis=the cell bursts)

the relative inelasticity and strength of the plant cell wall

Facilitated diffusion across a biological membrane requires ________ and moves a substance ________ its concentration gradient.

transport proteins... down