question

T/F
The distribution of lipids in the plasma membrane of eukaryotes is symmetrical.

answer

False

question

T/F
Like prokaryotic cells, most eukaryotic cells have an external cell wall.

answer

False

question

T/F
Lysosomes maintain an acidic environment by actively pumping protons into their interior.

answer

True

question

T/F
The endoplasmic reticulum is mostly devoid of ribosomes (smooth) when cells are producing large quantities of lipid.

answer

True

question

T/F
Coated pits containing clathrin do not permit concentration of ingested macromolecules prior to endocytosis.

answer

False

question

Endoplasmic reticulum (ER) with many ribosomes attached is called __________ ER, whereas endoplasmic reticulum that is mostly devoid of ribosomes is called __________ ER.

answer

rough, smooth

question

Ribosomes synthesizing proteins that are to be excreted are located on the __________.

answer

endoplasmic reticulum

question

T/F
The membrane bound structure that contains the chromosomes of eukaryotes is called the nucleus.

answer

True

question

T/F
Although similar in function, the eukaryotic ribosome is generally smaller and more complex than the prokaryotic ribosome.

answer

False

question

T/F
The nucleolus is a highly active region of the nucleus that is required for synthesis of ribosomes.

answer

True

question

T/F
Chloroplasts are the site for both the light and dark reactions of photosynthesis.

answer

True

question

T/F
The majority of mitochondrial proteins are manufactured under the direction of the nuclear DNA by cytoplasmic ribosomes.

answer

True

question

T/F
Electron transport reactions that occur in the mitochondria of eukaryotes take place on the inner membrane of that structure.

answer

True

question

The inner membrane system of chloroplasts consists of flattened sacs called __________ that form stacks called __________.

answer

thylakoids, grana

question

Long filaments containing microtubules and used for cellular locomotion are called __________ whereas short fibers containing microtubules and used for cellular locomotion are called __________.

answer

flagella, cilia

question

Cilia beat with two distinctive phases. With the __________ stroke, they stroke like an oar, thereby propelling the organism through the water. With the __________ stroke, cilia bend along their length while they are pulled forward.

answer

effective, recovery

question

Eukaryotic ribosomes may be free in the cytoplasm or attached to the __________ __________.

answer

endoplasmic reticulum

question

T/F
The genetic code is expressed differently in bacterial and archaeal cells than in eukaryotic cells.

answer

False

question

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 these cells.

answer

pellicle

question

T/F
The major difference between the vacuoles of eukaryotes and the inclusion bodies of prokaryotes is that the former are membrane-bound whereas the latter are not.

answer

True

question

T/F
Eukaryotes usually have more than one chromosome for the storage of genetic information.

answer

True

question

Membrane delimited intracellular structures that perform specific functions in cells are called A. organelles.? B. organs.? C. tissues. ?D. systomis.

answer

A

question

The plasma membrane of eukaryotes contains all of the following except
?A. phosphoglycerides.B. sphingolipids.C. sterols.D. peptidoglycan.

answer

D

question

Microdomains in eukaryotic plasma membranes can participate in

?A. cell movement.?B. cell division.?C. signal transduction.?D. all of these.

answer

D

question

The liquid component of the cytoplasm is known as the
A. thylakoid.?B. cytosol.?C. cytoskeleton.?D. stroma.

answer

B

question

Protein filaments with a diameter of 4–7 nm that play a role in cell movement and shape change are called A. microtubules.B. microfilaments.C. intermediate filaments.D. mycelia.

answer

B

question

Protein filaments with a diameter of about 10 nm that are major components of the cytoskeleton are called
A. microtubules.?B. microfilaments.?C. intermediate filaments.?D. mycelia.

answer

C

question

A filamentous organelle comprised of tubulins with a diameter of 25 nm is called
?A. microtubule.B. microfilament.C. intermediate filament.D. mycelia.

answer

A

question

The endoplasmic reticulum is composed of flattened sacs called A. thylakoids.?B. cristae.?C. cisternae.?D. vacuomes.

answer

C

question

The process by which a cell imports large particles by enclosing them in vesicles pinched off from the plasma membrane is called A. exocytosis.?B. phagocytosis.?C. pinocytosis.?D. nutrient cytosis.

answer

B

question

The Golgi apparatus is responsible for the
A. the assembly of ribosomes.? B. packaging of materials for excretion.? C. formation of mesosomes.? D. replication of chromosomes.

answer

B

question

A lysosome containing undigested material is called
?A. a phagosome.? B. an endosome.? C. a residual body.? D. a coated vesicle.

answer

C

question

Which of the following organelles is involved in the modification, packaging, and secretion of materials? ?A. Lysosomes ?B. Golgi apparatus ?C. Mitochondria?D. Centrioles

answer

B

question

Enzymes needed to digest all types of macromolecules are found in
?A. lysosomes.?B. Golgi apparatus.?C. mitochondria.?D. centrioles.

answer

A

question

Proteins are synthesized on structures called
?A. mesosomes.?B. lysosomes.?C. ribosomes.?D. chromosomes.

answer

C

question

The major site of cell membrane synthesis is the
?A. nucleus.?B. plasma membrane.?C. lysosome.?D. endoplasmic reticulum.

answer

D

question

Which of the following parts of the Golgi complex receives materials from the ER?
?A. Cis face.B. Trans face.C. Cisternal edges.D. None of these are correct.

answer

A

question

Receptor mediated endocytosis A. depends on formation of clathrin coated pits that pinch off.?B. is used to internalize molecules such as hormones, growth factors, iron, and cholesterol.C. involves formation of caveolae that are enriched in cholesterol and caveolin.?D. is typically used to internalize plasma membranes added by exocytosis.E. depends on formation of clathrin coated pits that pinch off and is used to internalize molecules such as hormones, growth factors, iron, and cholesterol.

answer

E

question

The Golgi apparatus is comprised of flattened, saclike structures called __________, which may be clustered in one region or scattered throughout the cell. A. cristae? B. thylakoids ?C. cisternae? D. vesiculae

answer

C

question

Stacks of cisternae in the Golgi apparatus are referred to as
A. stigmata.?B. golgisomes.?C. dictyosomes.?D. lamellisomes.

answer

C

question

The nucleolar organizer is a part of a specific chromosome that directs the synthesis of

?A. transfer RNA (tRNA).B. ribosomal RNA (rRNA).
?C. messenger RNA (mRNA).
?D. heterogeneous nuclear RNA (hnRNA).

answer

B

question

A (n) __________ is a special type of lysosome used by a cell to selectively digest and recycle cytoplasmic contents, such as mitochondria.
?A. suicide vacuole
?B. turnover lysosomeC. recycling vacuoleD. autophagosome

answer

D

question

The nucleolus plays a major role in synthesis of
A. mRNA.? B. tRNA.? C. rRNA.? D. transcription activation proteins.

answer

C

question

Which of the following is a function of the mitochondrion?
A. Tricarboxylic acid cycle enzyme reactions.B. Electron transport.C. ATP synthesis.
?D. All of the choices.

answer

D

question

The organelle responsible for harvesting light as an energy source for photosynthesis is the
A. kinetoplast.?B. centriole.?C. chloroplast.?D. mitochondrion.

answer

C

question

The enzymes and electron carriers involved in electron transport and oxidative phosphorylation are located in the __________ membrane of the mitochondrion.
A. inner? B. outer? C. inner and outer? D. neither inner nor outer

answer

A

question

The formation of carbohydrate (CO2 fixation) in the dark reaction of photosynthesis, takes place in the
A. stroma.?B. cytoplasm.?C. thylakoid membrane.?D. nucleus.

answer

A

question

The light reactions of photosynthesis, which form ATP and NADPH, take place in the A. stroma.
?B. cytoplasm.C. thylakoid membrane.
?D. nucleus.

answer

C

question

Construction of flagella and/or cilia is directed by the
A. axoneme.? B. tubulin. ?C. centriole.? D. basal body.

answer

D

question

An arrangement of microtubules located in the matrix of cilia and flagella is called the __________.
A. axial bundle? B. axial filament? C. axoneme? D. axillary tubule

answer

C

question

Flimmer filaments A. permit flagella to pull rather than push the cell.B. function to move cells on solid surfaces.C. are components of all eucaryotic flagella.D. None of the choices are true

answer

A

question

Which of the following is useful in distinguishing between prokaryotic and eukaryotic cells? A. The use of DNA for the storage of genetic information.?B. The presence of ribosomes for the synthesis of proteins.?C. The presence of membrane-delimited organelles within the cytoplasm.D. All of the choices.

answer

C

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