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PEREGRINE EXAM 4 TEST BANK
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PEREGRINE EXAM 4 TEST BANKLATEST 2024-2025 WITH UPDATED
QUESTIONS AND ANSWERS
(GRADED A+)
Which of the following statements about the endoplasmic reticulum (ER) is false?
(a) The ER is the major site for new membrane synthesis in the cell.
(b) Proteins to be delivered to the ER lumen are synthesized on smooth ER.
(c) Steroid hormones are synthesized on the smooth ER.
(d) The ER membrane is contiguous with the outer nuclear membrane. - answer-(b)
Proteins to be delivered to the ER lumen are synthesized on smooth ER
Which of the following statements about membrane-enclosed organelles is true?
(a) In a typical cell, the area of the endoplasmic reticulum membrane far exceeds
the area of plasma membrane.
(b) The nucleus is the only organelle that is surrounded by a double membrane.
(c) Other than the nucleus, most organelles are small and thus, in a typical cell,
only about 10% of a cell's volume is occupied by membrane enclosed organelles;
the other 90% of the cell volume is the cytosol.
(d) The nucleus is the only organelle that contains DNA. - answer-(a) In a typical
cell, the area of the endoplasmic reticulum membrane far exceeds the area of
plasma membrane
,Name the membrane-enclosed compartments in a eukaryotic cell where each of the
functions listed below takes place.
A. photosynthesis
B. transcription
C. oxidative phosphorylation
D. modification of secreted proteins
E. steroid hormone synthesis
F. degradation of worn-out organelles
G. new membrane synthesis
H. breakdown of lipids and toxic molecules - answer-A photosynthesis =
chloroplast
B. transcription = nucleus
C. oxidative phosphorylation = mitochondrion
D. modification of secreted proteins = Golgi apparatus and rough endoplasmic
reticulum (ER)
E. steroid hormone synthesis = smooth ER
F. degradation of worn-out organelles = lysosome
G. new membrane synthesis = ER
H. breakdown of lipids and toxic molecules = peroxisome
The _______ makes up about half of the total cell volume of a typical eukaryotic
cell. Ingested materials within the cell will pass through a series of compartments
called _______ on their way to the _______, which contains digestive enzymes
and will ultimately degrade the particles and macromolecules taken into the cell
and will also degrade worn-out organelles. The ________ has a cis and trans face
,and receives proteins and lipids from the _______, a system of interconnected sacs
and tubes of membranes that typically extends throughout the cell.
Cytosol, Golgi apparatus, nucleus, endoplasmic reticulum, lysosome, peroxisomes,
endosomes, mitochondria, plasma membrane - answer-The cytosol makes up about
half of the total cell volume of a typical eukaryotic cell. Ingested materials within
the cell will pass through a series of compartments called endosomes on their way
to the lysosome, which contains digestive enzymes and will ultimately degrade the
particles and macromolecules taken into the cell and will also degrade worn-out
organelles. The Golgi apparatus has a cis and trans face and receives proteins and
lipids from the endoplasmic reticulum, a system of interconnected sacs and tubes
of membranes that typically extends throughout the cell.
Which of the following organelles is not part of the endomembrane system?
(a) Golgi apparatus
(b) the nucleus
(c) mitochondria
(d) lysosomes - answer-(c) mitochondria
Which of the following statements is true?
(a) Lysosomes are believed to have originated from the engulfment of bacteria
specialized for digestion.
(b) The nuclear membrane is thought to have arisen from the plasma membrane
invaginating around the DNA.
(c) Because bacteria do not have mitochondria, they cannot produce ATP in a
membrane-dependent fashion.
, (d) Chloroplasts and mitochondria share their DNA. - answer-(b) The nuclear
membrane is thought to have arisen from the plasma membrane invaginating
around the DNA
Plasma membrane proteins are inserted into the membrane in the __________. The
address information for protein sorting in a eukaryotic cell is contained in the
________ of the proteins. Proteins enter the nucleus in their _______ form.
Proteins that remain in the cytosol do not contain a _______. Proteins are
transported into the Golgi apparatus via ________. The proteins transported into
the endoplasmic reticulum by ________ are in their _______ form.
amino acid sequence, Golgi apparatus, sorting signal, endoplasmic reticulum,
plasma membrane, transport vesicles, folded protein, translocators, unfolded -
answer-Plasma membrane proteins are inserted into the membrane in the
endoplasmic reticulum. The address information for protein sorting in a eukaryotic
cell is contained in the amino acid sequence of the proteins. Proteins enter the
nucleus in their folded form. Proteins that remain in the cytosol do not contain a
sorting signal. Proteins are transported into the Golgi apparatus via transport
vesicles. The proteins transported into the endoplasmic reticulum by protein
translocators are in their unfolded form.
Where are proteins in the chloroplast synthesized?
(a) in the cytosol
(b) in the chloroplast
(c) on the endoplasmic reticulum
(d) in both the cytosol and the chloroplast - answer-(d) in both the cytosol and the
chloroplast
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