Unit 3 CHPs 4&5

one function of peroxisomes involves the process of

detoxification

a single cell in a smokers lung has become cancerous. It doubles its DNA and divides much faster than a normal lung. the most likely change that would have caused this condition took place in the :

nucleus

the smooth endoplasmic reticulum

synthesizes lipids

a glycoprotein destined for secretion from the cell would move through the golgi complex in this sequence

cis face to trans face to medial region

a transmembrane protein differs from other membrane proteins because it

completely extends through the membrane

Evidence that all living cells have a common origin is provided by

basic similarities in cell structure and chemistry

all of the following are functions of the cell membrane except

being freely permeable to all substances

what is meant by the term "fluid mosaic model"

It is the movement of lipids and integral proteins within the lipid bilayer

nucleoli contain chromosomal regions that specialize in making

RNA

It is advantageous for cells to be small because

a small cell has a small volume relative to surface area, thereby increasing efficient transport

peripheral proteins are linked to either surface of the plasma membrane by

bonding to integral proteins through noncovalent interactions

which of the following pairs is correctly matched

centrosome-cell division

which of the following structures would not be found in cells of plant's roots

chloroplasts

in nondividing cells, dna associated with proteins, forming a complex called

chromatin

which of the following functions best explains the reason for the asymmetrically oriented structure of the proteins in the cell membrane

each type of protein has its owns function

cholesterol within membranes functions as a ____________through its interactions with both hydrophobic and hydrophilic parts of phospholipids

fluidity buffer

a eukaryotic cell

has a variety of membranous organelles

one strategy that allows larger cells to have an effective surface area to volume ration is:

having thin, finger-like projections

proteins that are destined to become associated with the inner surface of the plasma membrane are

made of free ribosomes in the cytoplasm

which of the following is a key component of the cytoskeleton

microtubules

which of the following organelles plays an important role in apoptosis, or programmed cell death

mitochondria

If a toxin, such as a bacterial toxin, destroys ribosomes, what cellular activity will be affected first?

protein synthesis

membrane bounded organelles facilitate faster chemical reactions because

reactants are within close proximity to each other

All of the following functions are performed by plant vacuoles EXCEPT:

storage of nucleic acids

During an infection, white blood cells travel to the infected site and phagocytize the pathogens. After phagocytosis, primary lysosomes fuse with the phagocytic vesicle to form a larger vesicle called a secondary lysosome. the reason for this is

to mix the pathogens with strong hydrolytic enzymes and destroys them