Chap 12 questions
Advanced Cell Biology (Liberty
University)
, Which of the following statements about the endoplasmic reticulum (ER) is false?
The ER is the major site for new membrane synthesis in the cell.
Proteins to be delivered to the ER lumen are synthesized on smooth ER.
Steroid hormones are synthesized on the smooth ER.
The ER membrane is contiguous with the outer nuclear membrane.
Which of the following statements about membrane-enclosed organelles is true?
In a typical cell, the area of the endoplasmic reticulum membrane far exceeds the area of plasma membrane.
The nucleus is the only organelle that is surrounded by a double membrane.
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.
The nucleus is the only organelle that contains DNA.
Which of the following organelles are not part of the endomembrane system?
(a) Golgi apparatus
(b)the nucleus
(c) mitochondria
(d)lysosomes
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
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
Which of the following statements is true?
(a) The signal sequences on mitochondrial proteins are usually C-terminal.
(b)Most mitochondrial proteins are not imported from the
cytosol but are synthesized inside the mitochondria.
(c) Chaperone proteins in the mitochondria facilitate the
movement of proteins across the outer and inner
mitochondrial membranes.
(d)Mitochondrial proteins cross the membrane in their native, folded state.
Most proteins destined to enter the endoplasmic reticulum
(a) are transported across the membrane after their synthesis is complete.
(b)are synthesized on free ribosomes in the cytosol.
(c) begin to cross the membrane while still being synthesized.
(d)remain within the endoplasmic reticulum.
After isolating the rough endoplasmic reticulum from the rest of the
cytoplasm, you purify the RNAs attached to it. Which of the following
proteins do you expect the RNA from the rough endoplasmic
reticulum to encode?
(a) soluble secreted proteins
(b)ER membrane proteins
(c) plasma membrane proteins
(d)all of the above
Advanced Cell Biology (Liberty
University)
, Which of the following statements about the endoplasmic reticulum (ER) is false?
The ER is the major site for new membrane synthesis in the cell.
Proteins to be delivered to the ER lumen are synthesized on smooth ER.
Steroid hormones are synthesized on the smooth ER.
The ER membrane is contiguous with the outer nuclear membrane.
Which of the following statements about membrane-enclosed organelles is true?
In a typical cell, the area of the endoplasmic reticulum membrane far exceeds the area of plasma membrane.
The nucleus is the only organelle that is surrounded by a double membrane.
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.
The nucleus is the only organelle that contains DNA.
Which of the following organelles are not part of the endomembrane system?
(a) Golgi apparatus
(b)the nucleus
(c) mitochondria
(d)lysosomes
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
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
Which of the following statements is true?
(a) The signal sequences on mitochondrial proteins are usually C-terminal.
(b)Most mitochondrial proteins are not imported from the
cytosol but are synthesized inside the mitochondria.
(c) Chaperone proteins in the mitochondria facilitate the
movement of proteins across the outer and inner
mitochondrial membranes.
(d)Mitochondrial proteins cross the membrane in their native, folded state.
Most proteins destined to enter the endoplasmic reticulum
(a) are transported across the membrane after their synthesis is complete.
(b)are synthesized on free ribosomes in the cytosol.
(c) begin to cross the membrane while still being synthesized.
(d)remain within the endoplasmic reticulum.
After isolating the rough endoplasmic reticulum from the rest of the
cytoplasm, you purify the RNAs attached to it. Which of the following
proteins do you expect the RNA from the rough endoplasmic
reticulum to encode?
(a) soluble secreted proteins
(b)ER membrane proteins
(c) plasma membrane proteins
(d)all of the above
