Micro Lecture Exam 1 chap 3

Flashcard maker : Sara Edwards
Which of the following statements about the endoplasmic reticulum (ER) is CORRECT? 1) _______
A) The ER is a transport system within the cytoplasm.
B) The smooth ER has ribosomes associated with it.
C) The rough ER is the site of lipid synthesis.
D) The smooth ER is a site of ATP synthesis.
E) The ER is a lipid storage organelle.
a
Which of the following statements concerning the endosymbiotic theory is FALSE? 2) _______
A) Eukaryotes were formed from the union of small anaerobic cells by larger aerobic cells.
B) Mitochondria and chloroplasts can divide independently of the cell.
C) The cristae of mitochondria evolved from the cytoplasmic membrane of prokaryotes.
D) The endosymbiotic theory is not universally accepted.
E) Mitochondria and chloroplasts have their own DNA and ribosomes.
a
Cell walls composed of polysaccharide are found in
A) eukaryotes only.
B) archaea only.
C) bacteria only.
D) archaea and eukaryotes only.
E) archaea, bacteria, and eukaryotes.
d
Which of the following is NOT a component of bacterial flagella? A) filament
B) flagellin
C) tubulin
D) hook
E) basal body
c
Which of the following molecules would be expected to cross the cytoplasmic membrane rapidly and without the use of transport proteins?
A) large molecules only
B) small hydrophobic molecules only
C) small hydrophilic molecules only
D) ions only
E) both ions and hydrophilic molecules
b
________ may have pili.
A) Bacteria
B) Eukaryotes
C) Archaea
D) Prokaryotes
E) Both eukaryotes and bacteria
a
Lipid A is a component of
A) lipopolysaccharides.
B) mycolic acid.
C) bacterial glycocalyces.
D) plant cell walls.
E) cytoplasmic membranes
a
Which of the following processes requires a carrier protein?
A) diffusion only
B) facilitated diffusion only
C) active transport only
D) both facilitated diffusion and active transport
E) endocytosis only
d
Which of the following is unique to archaea?
A) peptidoglycan
B) fimbriae
C) pili
D) hami
E) LPS
d
Protein synthesis occurs in the
A) nucleus.
B) ribosome.
C) periplasmic space.
D) inclusion.
E) cytoskeleton.
b
Which of the following is classified as a nonmembranous organelle of eukaryotic cells?
A) endoplasmic reticulum
B) mitochondrion
C) centriole
D) Golgi body
E) peroxisome
c
The glycocalyx of a eukaryotic cell performs all of the following functions EXCEPT
A) protection against dehydration.
B) transfer of genetic material between cells.
C) cellular recognition and communication.
D) anchoring cells to each other.
E) strengthening the cell surface.
b
The cytoplasmic membranes of ________ contain phospholipids and proteins.
A) archaeal cells
B) eukaryotic cells
C) bacterial cells
D) both bacterial and eukaryotic cells
E) archaeal, bacterial, and eukaryotic cells
d
Which of the following statements concerning the characteristics of life is FALSE?
A) living things store metabolic energy in the form of chemicals such as ATP.
B) reproduction is defined as an increase in the size of an organism.
C) reproduction can occur asexually or sexually in living things.
D) viruses have some, but not all, of the characteristics of living things.
E) organisms may not exhibit all of the characteristics of life at all times.
b
Endocytosis and exocytosis are means of transport used by
A) eukaryotes.
B) bacteria.
C) archaea.
D) all prokaryotes.
E) nothing; no cells use both processes.
a
Peroxisomes contain enzymes used to digest nutrients that have been brought into the cell through phagocytosis.
f
Cytoplasmic membranes of ________ are composed of phospholipids.
A) bacteria
B) prokaryotes
C) archaea
D) eukaryotes
E) bacteria and eukaryotes
e
Which of the following may have cell walls containing teichoic acids?
A) Gram-positive bacteria only
B) archaea
C) Gram-negative bacteria only
D) both Gram-positive and Gram-negative bacteria
E) all prokaryotes
a
Lipid-soluble molecules would be expected to cross the cytoplasmic membrane by which of the following processes?
A) diffusion
B) active transport
C) osmosis
D) facilitated diffusion
E) group translocation
a
Which of the following is NOT a function of the eukaryotic cytoskeleton?
A) gives shape to the cell
B) performs endocytosis
C) aids in contraction of the cell
D) packages cellular secretions
E) anchors organelles
d
Which of the following statements concerning osmosis is FALSE? A) Osmosis stops when the system reaches equilibrium.
B) Osmosis requires a selectively permeable membrane.
C) During osmosis, water crosses to the side of the membrane with a lower solute concentration.
D) Crenation results when cells are placed in a hypertonic solution.
E) Cells placed in hypotonic solutions will gain water.
c
Which of the following is associated with the mitochondria of a eukaryotic cell? A) cristae B) nucleolus C) chromatin D) inclusions E) thylakoids
a
Which of the following may be a component of bacterial cell walls?
A) mycolic acid
B) carrageenan
C) tubulin
D) lipoteichoic acids
E) both lipoteichoic and mycolic acids
e
Lysosomes result from the endocytosis of food particles by eukaryotic cells.
f
Which of the following statements concerning pili is FALSE?
A) Pili are longer than fimbriae and flagella.
B) Pili are long, hollow tubules.
C) Not all bacteria have pili.
D) Pili facilitate the transfer of DNA among bacterial cells.
E) A bacterial cell will usually have only one or two pili.
a
Endospores survive a variety of harsh conditions in part because of the presence of
A) lipopolysaccharide.
B) hopanoids.
C) glycoproteins.
D) dipicolinic acid.
E) mycolic acid.
d
All cell membranes contain phospholipids and a wide variety of proteins.
f
ATP is expended in which of the following processes?
A) facilitated diffusion
B) group translocation
C) active transport
D) diffusion
E) both active transport and group translocation
e
Bacteria of the genus Mycoplasma lack cell walls. What sort of environment do they require for survival?
A) hypotonic
B) low temperature
C) a biofilm
D) isotonic
E) hypertonic
d
Which of the following have a periplasmic space?
A) Gram-negative bacteria only
B) Gram-positive bacteria only
C) both Gram-positive and Gram-negative bacteria
D) eukaryotes
E) archaea
a
Some ________ use group translocation as a means of transport.
A) archaea
B) eukaryotes and prokaryotes
C) bacteria
D) protozoa
E) eukaryotes
c
Formation of a biofilm may contribute to bacteria’s ability to cause disease.
t
Using a microscope, you observe an amoeba moving toward a food source. This is an example of
A) metabolism.
B) responsiveness.
C) reproduction.
D) cellular structure.
E) growth.
b
Which of the following statements concerning prokaryotic flagella is TRUE?
A) Prokaryotic flagella move in a whip-like manner.
B) Prokaryotic flagella are anchored to the cell wall by means of the basal body.
C) Treponema is an example of a bacterium that has a tuft of polar flagella.
D) Prokaryotic flagella are composed of tubulin.
E) A “run” results from clockwise movement of the flagellum.
b
Which of the following is paired incorrectly?
A) bacteria; peptidoglycan cell wall
B) archaea; polysaccharide cell wall
C) algae; glycocalyx present
D) fungi; chitin, glucomannan and/or cellulose cell wall
E) plants; cellulose cell wall
c
Which of the following statements concerning endocytosis and exocytosis is TRUE?
A) Waste products and secretions are exported from the cell during endocytosis.
B) Endocytosis produces a structure called a food vesicle.
C) These processes occur in both prokaryotes and eukaryotes.
D) Phagocytosis is a type of endocytosis in which liquids are brought into the cell.
E) Endocytosis is a form of passive transport, whereas exocytosis is a form of active transport.
b
Which of the following organelles is responsible for producing most of the ATP in a eukaryotic cell?
A) smooth endoplasmic reticulum
B) Golgi body
C) nucleus
D) lysosome
E) mitochondrion
e
Which of the following chemical substances contributes to the unique characteristics of acid-fast bacteria?
A) endotoxin
B) mycolic acid
C) peptidoglycan
D) lipoteichoic acid
E) N-acetylglucosamine
b
Which of the following prokaryotic cells contain an outer membrane?
A) Gram-negative bacteria only
B) Gram-positive bacteria only
C) both Gram-positive and Gram-negative bacteria
D) archaea
E) all prokaryotes
a
Which of the following statements concerning centrioles is FALSE?
A) The structure of centrioles is similar to that of eukaryotic flagella and cilia.
B) Centrioles are believed to play a role in cellular processes such as mitosis and cytokinesis.
C) Centrioles are found in all organisms except prokaryotes.
D) Centrioles are composed of microtubules.
E) Centrioles are found in a region of the cell called the centrosome.
c
Membrane rafts are found in the cytoplasmic membranes of
A) eukaryotes only.
B) archaea only.
C) bacteria only.
D) both archaea and bacteria.
E) both archaea and eukaryotes.
a
Chloroplasts use light energy to produce ATP and carbohydrates.
t
Which of the following bacterial cell structures plays an important role in the creation of biofilms?
A) fimbriae
B) glycocalyces
C) flagella
D) pili
E) both fimbriae and glycocalyces
e
Eukaryotic ribosomes are composed of 50S and 30S subunits.
f
The accumulation of glucose 6-phosphate inside a bacterial cell via phosphorylation of glucose is an example of
A) plasmolysis.
B) diffusion.
C) facilitated diffusion.
D) osmosis.
E) group translocation.
e
Bacterial cell walls that are resistant to drying contain
A) tubulin.
B) amino acids.
C) lipopolysaccharide.
D) carbohydrates.
E) waxes.
e
Chloroplasts differ from mitochondria in that the former have
A) DNA.
B) thylakoids.
C) 70S ribosomes.
D) cristae.
E) two lipid bilayers.
b
Short, hairlike structures used only by eukaryotic cells for movement are called
A) fimbriae.
B) cilia.
C) pseudopodia.
D) flagella.
E) pili.
b
Chromatin is composed of DNA and special packaging proteins called hopanoids.
f
Some members of ________ have hami.
A) bacteria
B) archaea
C) eukaryotes
D) archaea and bacteria
E) bacteria and eukaryotes
b
Hopanoids are found in ________ cytoplasmic membranes.
A) eukaryotic
B) prokaryotic
C) bacterial
D) archaeal
E) no
c
Bacterial protein synthesis can begin before the reading of the gene is complete.
t
A lipid found in prokaryotes but not in eukaryotes is
A) hopanoid.
B) phospholipid.
C) triglyceride.
D) fatty acid.
E) steroid.
a
The cell walls of some ________ are composed of proteins.
A) bacteria
B) archaea
C) prokaryotes
D) eukaryotes
E) bacteria and eukaryotes
b

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