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