BIO 111- Chapter #5 Mastering HW

A(n) ____________ solution has a higher concentration of dissolved particles than an adjacent solution.

hypertonic

Which of these is hydrophobic like the interior of the plasma membrane? a. lipid soluble molecule b. glucose c. glucose and hydrogen ion d. water e. hydrogen ion

A. lipid soluble molecule

Pinocytosis is one form of ______________, the movement of large materials into a cell by an infolding of the plasma membrane.

endocytosis

The primary role of _____ is to bind animal cells together. a. desmosomes b. tight junctions c. the cytoskeleton d. gap (communicating) junction e. plasmodesmata

a. desmosomes

Identify Structure A. a. glycoprotein b. protein c. cholesterol d. extracellular matrix e. phospholipid

a. glycoprotein

Why can't cells get as large as golf balls? a. A cell that large would collapse under its own weight. b. A cell that large would not have enough surface area to use in exchanging materials. c. A cell that large would not have enough energy inside it to run. d. A cell that large would be too hypertonic to prevent swelling. e. A cell that large wouldn't have enough volume to conduct chemical reactions.

b. A cell that large would not have enough surface area to use in exchanging materials.

What name is given to the process by which water crosses a selectively permeable membrane? a. phagocytosis b. osmosis c. diffusion d. passive transport e. pinocytosis

b. osmosis

You know that this cell is in a(n) _____ solution because it _____. a. hypotonic ... lysed b. hypotonic ... is turgid c. hypertonic solution ... lost water d. hypertonic ... gained water e. hypertonic ... lysed

c. hypertonic solution ... lost water

Identify Structure D. a. glycoprotein b. protein c. phospholipid bilayer of membrane d. extracellular matrix e. cholesterol

c. phospholipid bilayer of membrane

What is the function of Structure E? a. transport across the plasma membrane b. detection of environmental change c. stabilization of the phospholipids d. cell-cell communication e. structural support of the cell

c. stabilization of phospholipids

Water crosses the plasma membrane a. against its concentration gradient b. using a process that requires energy from the cell c. through facilitated diffusion or diffusion d. through active transport e. through contransport

c. through facilitated diffusion or diffusion

Structure A in the figure is a a. antibody b. enzyme c. transport protein d. receptor molecule e. structural protein

c. transport protein

A molecule moves down its concentration gradient using a transport protein in the plasma membrane. This is an example of a. active transport b. diffusion c. exocytosis d. facilitated diffusion e. endocytosis

d. facilitated diffusion

_____ aid in the coordination of the activities of adjacent animal cells. a. desmosomes b. keratin fibers c. plasmodesmata d. gap (communicating) junctions e. tight junctions

d. gap (communicating) junctions

You know that this cell is an ________ solution because the cell __________ a. hypertonic ... lost water b. hypotonic ... shrunk c. isotonic ... neither lost nor gained water d. hypotonic ... swelled e. hypertonic ... gained water

d. hypotonic ... swelled

Which of these cell junctions form a barrier to the passage of materials? a. keratin fibers b. plasmodesmata c. desmosomes (anchoring junctions) d. tight junctions e. gap (communicating) junctions

d. tight junctions

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 a. facilitated diffusion b. passive transport c. diffusion d. exocytosis e. active transport

e. active transport

The plasma membrane forms a pocket that pinches inward, forming a vesicle that contains material from outside the cell. This describes the process of a. diffusion b. exocytosis c. passive transport d. active transport e. endocytosis

e. endocytosis

This cell is in a ______ solution a. hypotonic and isotonic b. isotonic c. hypotonic d. hypertonic or isotonic e. hypertonic

e. hypertonic

In active transport... a. molecules move across the plasma membrane by crossing the lipid bilayer directly, rather than by using a transport protein. b. no energy input is required from the cell. c. the plasma membrane forms a pocket that pinches inward, forming a vesicle that contains material from outside the cell. d. a vesicle inside the cell fuses with the plasma membrane and releases its contents outside the cell. e. molecules move across the plasma membrane against their concentration gradient.

e. molecules move across the plasma membrane against their concentration gradient.

_____________ is the movement of materials out of a cell through the fusion of a transport vesicle with the plasma membrane.

exocytosis

A(n) ____________ solution has a lower concentration of dissolved particles than an adjacent solution.

hypotonic

A(n) ________ solution has the same concentration of dissolved particles as an adjacent solution.

isotonic

_____________ is the movement of large materials into a cell by wrapping extensions of the plasma membrane around the material and engulfing it by fusing the extensions together.

phagocytosis

Embedded within the phospholipid bilayer surrounding a cell are __________ _________, which regulate the movement of hydrophilic molecules from one side of the plasma membrane to the other.

transport proteins