15-2. Explain whether the following statements are true or false.Justify the false ones.A. Ribosomes are the cytoplasmic structures that duringProtein synthesis is linked by an mRNA moleculeforming polyribosomes.B. The Leu-His-Arg-Leu-Asp-Ala-Gln-Ser- Amino Acid SequenceLys-Leu-Ser-Ser is a signal sequence that directs proteinsinto the endoplasmic reticulum.C. All transport vesicles in the cell must have av-SNARE protein in its membrane.D. The transport vesicles carry protein and lipid to thecell surface.E. If the delivery or distribution of lysosomal proteinsprospects from the trans-Glogii network to endosomes areblock, lysosomal proteins would be secreted by pathwaysof constitutive secretion like those in Figure 15-28.F. Lysosomes digest only substances that have been takenby cells by endocytosis. 15.3 Many of the proteins produced in the reticulumendoplasmic changes such as the addition ofcarbohydrates (oligosaccharides). What is the function of thesesugars in such proteins? 15.4 Discuss the importance of the following organelles: cytosol, nucleus, endoplasmic reticulum, Golgi apparatus, lysosomes, endosomes, mitochondria, chloroplasts (in plant cells), and peroxisomes.
15-2. Explain whether the following statements are true or false.
Justify the false ones.
A. Ribosomes are the cytoplasmic structures that during
Protein synthesis is linked by an mRNA molecule
forming polyribosomes.
B. The Leu-His-Arg-Leu-Asp-Ala-Gln-Ser- Amino Acid Sequence
Lys-Leu-Ser-Ser is a signal sequence that directs proteins
into the endoplasmic reticulum.
C. All transport vesicles in the cell must have a
v-SNARE protein in its membrane.
D. The transport vesicles carry protein and lipid to the
cell surface.
E. If the delivery or distribution of lysosomal proteins
prospects from the trans-Glogii network to endosomes are
block, lysosomal proteins would be secreted by pathways
of constitutive secretion like those in Figure 15-28.
F. Lysosomes digest only substances that have been taken
by cells by endocytosis.
15.3 Many of the proteins produced in the reticulum
endoplasmic changes such as the addition of
carbohydrates (oligosaccharides). What is the function of these
sugars in such proteins?
15.4 Discuss the importance of the following organelles: cytosol, nucleus, endoplasmic reticulum, Golgi apparatus, lysosomes, endosomes, mitochondria, chloroplasts (in plant cells), and peroxisomes.
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