bio chapter 6

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____ are surface appendages that allow a bacterium to stick to a surface


what is the function of a bacterium’s capsule?


The DNA-containing region of this bacterial cell is indicated by the letter _____.

D the nucleoid region

where is a bacterial cell’s DNA found?

nucleoid region

in a bacterium, where are proteins synthesized?


What name is given to the rigid structure, found outside the plasma membrane, that surrounds and supports the bacterial cell?

cell wall

The _____ is the bacterial structure that acts as a selective barrier, allowing nutrients to enter the cell and wastes to leave the cell.

plasma membrane

The structure that regulates the passage of material into and out of this bacterial cell is indicated by the letter _____.

c the plasma membrane

what is the function of the nucleus?

it houses DNA

mitosis refers to

producing new cells

what is the function of the cell membrane?

take in and release materials

Which of the following is most important to transport within a cell?

cell membrane
microtubules and intracellular membranes
all of the above

microtubules and intracellular membranes

when do cells take on their unique characteristics?

during embryonic development

beginning with the nucleus, the first step leading to the synthesis of a polypeptide is

transferring of information from DNA to messenger RNA

WHICH molecules do not normally cross the nuclear membrane?


Which of the following statements about the nuclear envelope is false?

The nuclear envelope is continuous with the Golgi apparatus.
The nuclear envelope is composed of two lipid bilayers.
Molecules pass into and out of the nucleus through nuclear pores.
Nuclear pores are made up of a group of proteins that are collectively called the nuclear pore complex.

the nuclear envelope is continuous with the golgi apparatus

true or false? Large proteins containing a nuclear localization signal (NLS) bind to the nuclear pore and enter the nucleus without any expenditure of energy.


A small protein (molecular weight = 25,000 daltons) is injected into a cell and observed in the nucleus a short time later. What type of transport has taken place?


an experiments to test whether a protein can enter the nucleus, why would proteins be labeled with fluorescent molecules?

to make the proteins easy to see

the ________ signal is only present in the fusion protein that enters the nucleus

nuclear localization

Pancreatic cells, which secrete a large amount of digestive enzymes, are labeled with radioactive leucine and then chased for several hours with nonradioactive leucine. Photographic emulsions are prepared at different times during the chase. Where would the black spots appear on an emulsion prepared 3 hours after the pulse?

exterior of the cell

What path does a protein in the secretory pathway take, starting from its site of synthesis?

rough ER, golgi apparatus, secretory vesicles, plasma membrane

What scientific hypotheses can be tested by a pulse-chase experiment?

movement of molecules through a cell over time

True or false? Proteins produced during the "chase" phase of a pulse-chase experiment are labeled with radioactive material.


what is the first step in a pulse-chase experiment

incubating cells with a labeled molecule

Which organelle plays a role in intracellular digestion?


3 functions of smooth er

Calcium ion storage lipid synthesis poinson detoxification

function of rough er

protein sunthesis

function of golgi apparatus 2

protein modification and sorting cisternal maturation

2 function of lysosomes

autophagy macromolecule digestion

which proteins are synthesized by bound ribosomes?

ER protein, insulin, lysomal enzyme

the cilia and flagella of a eukaryotic cells are composed of


which of these cell junctions form a barrier to the passage of materials?

tight junctions

the primary role of ______ is to bind animal cells togeher


______ aid in the coordination of the activities of adjacent animal cells

Gap junctions (communicating)

choose the letter that indicates the organelle that contains most of a cell’s DNA

C the nucleus contains most of a cell’s DNA

which of these organelles carries out cellular respiration


which of these is the double membrane that encloses the nucleus

e (nucleur envelop)

The _____ is composed of DNA and protein


ribosomal subunits are manufactured by the


_____ are the sites of protein synthese


Which of these manufactures cellular membranes by adding membrane proteins and phospholipids to its own membrane?

rough endoplasmic reticulum

the ______ is a selective barrier, regulating the passage of material into and out of the cell

plasma membrane

the _____ is a selective barrier, regulating the passage of material into and out of the cell


where is calcium stored

smooth endoplasmic reticulum

which of these structures stores, modifies, and packages products?

A the golgi apparatus modifies, stores, and packages products of theER

which of these are hollow rods that shape and support the cell?


_____ are identical in structure to centrioles

basal bodies

what organelle produces H2O2 as a by product


which of these provides the cell with structural support?

D microfilaments are a component of the cytoskeleton

structures found in only plant cells

chloroplast cellulose cell wall central vacuole

structure found only in animal cell


structures found in both animal and plant cells

endoplasmic reticulum mitochondrion golgi apparatus cytoskeleton plasma membrane nucleus

what does the plant cell wall do

its a strong protective structure made from cellulose fibrils

what does the central vacuole do

it regulates cytoplasm composition, creates internal pressure, and stores cell compounds

what does chloroplst do

makes sugar by converting light energy into chemical energy

mitochondrion function?

produces chemical energy (tap) the can power the cell

golgi apparatus function?

modifies and packages proteins

cell strucure of prokaryotic?


eukaryotic function?

lysosome, mitochondria, nucleolus

cell structue of both prokaryotic and eukaryotic

ribosomes plasma membrane flagella

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