Biology Test 1/11

define diffusion

The movement of molecules or particles from and area of high concentration to an area of lower concentration.

Amino acids, sugars, and ions move across the cell membrane. Their movement from a region of high concentration to a region of low concentration is accomplished by special proteins in the membrane. Which of the following terms applies to this type of cell transport? a.facilitated diffusion b. osmosis c. simple diffusion d. active transport

a

An animal cell that is surrounded by fresh water will burst because the osmotic pressure causes a. water to move into the cell. b. solutes to move into the cell. c. water to move out of the cell. d. solutes to move out of the cell.

a

The cell membrane contains channels and pumps that help move materials from one side to the other. What are these channels and pumps made of? a. carbohydrates c. bilipids b. lipids d. proteins

a

What directly supplies the energy needed to actively transport sodium ions across the plasma membrane of a cell? a.ATP b.DNA c.enzymes d.lipids

a

When Streptococcus pneumoniae are exposed to an antibiotic, the bacteria try to pump the antibiotic out of their cells. Which of the following mechanisms is most likely used by the Streptococcus pneumoniae to pump the antibiotic out of their cells? a. active transport b. diffusion c. facilitated diffusion d. osmosis

a

Which of the following structures helps maintain the shape of a plant cell even when water is scarce? a. cell wall b. endoplasmic reticulum c. Golgi apparatus d. plasma membrane

a

Diffusion is the movement of molecules from a. an area of low concentration to an area of high concentration. b. an area of high concentration to an area of low concentration. c. an area of equilibrium to an area of high concentration. d. all of the above

b

In pure water, a red blood cell from an animal will swell and burst, but a leaf cell from a plant will not. Which structure in the leaf cell is responsible for this difference? a. cell membrane b. cell wall c. mitochondrion d. nucleus

b

The diffusion of water across a selectively permeable membrane is called a. osmotic pressure. c. facilitated diffusion. b. osmosis. d. active transport.

b

A cell has a defect that results in the loss of its ability to regulate the passage of water, food, and wastes into and out of the cell. In which of the following cell structures is this defect most likely to be located? a. ribosomes b. chloroplasts c. cell membrane d. endoplasmic reticulum

c

Diffusion occurs because a. molecules constantly move and collide with each other. b. the concentration of a solution is never the same throughout a solution. c. the concentration of a solution is always the same throughout a solution. d. molecules never move or collide with each other.

c

If an animal cell is placed in distilled water, it will swell and burst. The bursting of the cell is a result of which biological process? a. active transport b. enzyme activity c. osmosis d. respiration

c

The most external structure in a animal cell is the a. mitochondrion. b. centriole. c. cell membrane. d. cell wall.

c

Which of the following functions does active transport perform in a cell? a. packaging proteins for export from the cell b. distributing enzymes throughout the cytoplasm c. moving substances against a concentration gradient d. equalizing the concentration of water inside and outside the cell

c

The most external structure in a plant cell is the a. mitochondrion. b. centriole. c. cell membrane. d. cell wall.

d

When the concentration of molecules on both sides of a membrane is the same, the molecules will a. move across the membrane to the outside of the cell. b. stop moving across the membrane. c. move across the membrane in both directions. d. move across the membrane to the inside of the cell.

d

Which means of particle transport requires input of energy from the cell? a. diffusion c. facilitated diffusion b. osmosis d. active transport

d

Which of the following is a function of the cell membrane? a. breaks down lipids, carbohydrates, and proteins from foods b. stores water, salt, proteins, and carbohydrates c. keeps the cell wall in place d.regulates which materials enter and leave the cell

d

Which of the following is an example of active transport? a. chromosomes migrating during cell division b. water diffusing throughout the cytoplasm of a cell c. cilia moving rapidly to propel a single-celled organism through water d. proteins moving ions from low to high concentration across a cell membrane

d