Ch. 5 Questions Flashcards
T/F: The distribution of lipids in the plasma membrane of eukaryotes is symmetrical
false
T/F: Like proaryotic cells, most eukaryotic cells have an external cell wall
false
T/F: lysosomes maintain an acidic environment by actively pumping protons into their interior
true
T/F: the endoplasmic reticulum is mostly devoid of ribosomes (smooth) when cells are producing large quantities of lipid
true
T/F: coated pits containing clathrin do not permit concentration of ingested marcomolecules prior to endocytosis
false
endoplasmic reticulum (ER) with many ribosomes attached is called ___ ER, whereas endoplasmic reticulum that is mostly devoid of ribosomes is called __ ER
rough, smooth
ribosomes synthesizing proteins that are to be excreted are located on the
endoplasmic reticulum
T/F: the membrane bound structure that contains the chromosomes of eukaryotes is called the nucleus
true
T/F: although similar in function, the eukaryotic ribosome is generally smaller and more complex than the prokaroytic ribosome
false; its larger not smaller
T/F: the nucleous is a highly active region of the nuceleus that is required for synthesis of ribosomes
true
T/F choloroplasts are the site for both the light and dark reactions of photosynthesis
true
T/F: the majority of mitochondrial proteins are manufactured under the direction of the nuclear DNA by cytoplasmic ribosomes
true
T/F: electron transport reactions that occur in the mitochondria of eukaryotes take place on the inner membrane of that structure
true
the inner membrane system of chloroplasts consists of flattened sacs called __ that form stacks called _
thylakoids, grana
long filaments containing microtubules and used for cellular locomotion are called __ whereas short fibers containing microtubules and used for cellular locomotion are called ___
flagella, cilia
Cilia beat with two distinctive phases.. with the )) stroke, they stroke likean oar, thereby propelling the organism through the water. With the ___ stroke, cilia bend along their length while they are pulled forward
effective, recovery
eukaryotic ribosomes may be free in the cytoplasm or attached to the ___ ___
endoplasmic reticulum
T/F: the genetic code is expressed differently in bacterial and archaeal cells than in eukaryotic cells
false
the __ is a complex structure or set of structures lying beneath the plasma membrane of many protozoa and some algae, which serves as a supportive mechanism for the cells
pellicle
T/F:the major difference between the vacuoles of eukaryotes and the inclusion bodies of prokaroytes is that the former are membrane-bound whereas the latter are not
true
T/F: Eukaryotes usually have more than one chromosome for the storafe of genetic information
true
Membrane delimited intracellular structures that perform specific functions in cells are called:
organelles
the plasma membrane of eukaryotes contains all of the followin except: A) phosphoglycerides B) sphingolipids C) sterols D) peptidoglycan
peptidoglycan
microdomains in eukaryotic plasma membranes can participate in: A) cell movement, B) cell division C) signal transduction D) all of the above
all of the above
the liquid component of the cytoplasm is known as the
cytosol
protein filaments with a diameter of 4-7 nm that play a role in cell movement and shape change are called
microfilaments
protein filaments with a diameter of about 10nm that are major components of the cytoskeleton are called
intermediate filaments
a filamentous organelle comprised of tubulins with a diameter of 25 nm is called
microtubule
the endoplasmic reticulum is composed of flattened sacs called
cisternae
the process by which a cell imports large particles by enclosing them in vesicles pinched off from the plasma membrane is called
phagocytosis
the golgi apparatus is responsible for the
packaging of materials for excretion
a lysosome containing undigested material is called
a residual body
enzymes needed to digest all types of macromolecules are found in
lyosomes
proteins are synthesized on structures called
ribosomes
the major site of cell membrane synthesis is the
endoplasmic reticulum
which of the following parts of the golgi complex receives materials from the ER? A) Cis face B) Trans face B) cisternal edges
cis face
receptor mediated endocytosis
depends on formation of clathrin coated pits that pinch off and is used to internalize molecules such as hormones, growth factors, iron, and cholesterol
the golgi apparatus is comprised of flattened, saclike structures called __ which maybe clustered in one region or scattered throughout the cell
cisternae
stacks of cisternae in the golgi apparatus are referred to as
dictyosomes
the nucleolar organizer is a part of a specific chromosome that directs the synthesis of
ribosomal RNA (rRNA)
a(n) __ is a special type of lysosome used by a cell to selectively digest and recycle cytoplasmic contents, such as mitochondria
autophagosome
the nucleolus plays a major role in synthesis of
rRNA
which of the following is a function of mitochondrion: A. tricarboxylic acid cycle enzyme reactions B. electron transport C. ATP synthesis D. all of the choices
all of the choices
the organelle responsible for harvesting light as an energy source for photosynthesis is the
chlorpolast
the enzymes and electron carriers involved in electron transport and oxidative phosphorylation are located in the __ membrane of the mitochondrion
inner
the formation of carbohydrate (CO2 fixation) in the dark reaction of photosynthesis, takes place in the
stroma
the light reactions of photosynthesis, which form ATP and NADPH, take place in the
thylakoid membrane
construction of flagella and/or cilia is directed by the
basal body
an arrangement of microtubules located in the matrix of cilia and flagella is called the
axoneme
permit flagella to pull rather than push the cell
flimmer filaments
the presecnce of membrane- delimited organelles within the cytoplasm is useful in distinguishing between __ cells and eukaryotic cells
prokaryotic
