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The clear, structureless gel in a cell is its

transmembrane protein

The Na⁺-K⁺ pump is

active transport

Which of the following processes could occur only in the plasma membrane of a living cell?


Cells specialized for absorption of matter from the ECF are likely to show an abundance of


Aquaporins are transmembrane proteins that promote

do not chemically change their ligands

Membrane carriers resemble enzymes except for the fact that carriers

Na⁺ concentration gradient

The cotransport of glucose derives energy from

to bind to the first messenger

The function of cAMP in a cell is

endoplasmic reticulum

Most cellular membranes are made by


Matter can leave a cell by any of the following means except


Most human cells are 10 to 15 ____ in diameter.

second messenger

When a hormone cannot enter a cell, it activates the formation of a/an ____ inside the cell.


gates in the plasma membrane open or close in response to changes in the electrical charge difference across the membrane.

hydrostatic pressure

The force exerted on a membrane by water is called ___.


A concentrated solution that causes a cell to shrink is ___ to the cell.


Fusion of a secretory vesicle with the plasma membrane, and release of the vesicle's contents, is called ____.

nucleus, mitochondria

Tow organelles that are surrounded by a double unit membrane are the ____ and the ____.

smooth ER, peroxisomes

Liver cells can detoxify alcohol with two organelles, the ___ and ____.

ligand-regulated gate

An ion gate in the plasma membrane that opens or closes when a chemical binds to it is called a/an ____.


The space enclosed by the unit membrane of the Golgi complex and endoplasmic reticulum is called the ____.


The plasma membrane consists primarily of _____.


The brush border is composed of ____.

osmosis does not require ATP

If a cell were poisoned so it could not make ATP, osmosis through its membrane would _____.

active transport

Material can move either into or out of a cell by means of ____.

activate enzymes in the cell

A cell's second messengers serve mainly to _____


The Golgi complex makes _____ but not peroxisomes.

transmembrane protein

A channel could not move material from the outside of a cell to the inside unless it extended all the way across the membrane


Human cells swell or shrink in any solution other than an _____ one.


_____is not limited by the transport maximum (Tm).


It is very unlikely for a cell to have more centrosomes than _____.

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