A cell biologist has developed a new drug that blocks vesicle transport at the cis face of the Golgi apparatus. What will this drug prevent from happening inside a cell?
A. The movement of vesicles from mitochondria to the Golgi apparatus.
B. The synthesis of proteins or lipids on the endoplasmic reticulum.
C. The movement of materials from the Golgi apparatus to the plasma membrane.
D. The movement of the lipids and proteins from the endoplasmic reticulum to the Golgi apparatus.
Answer: D
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Which of the following is true of the trafficking of proteins from the cytosol to the endoplasmic reticulum?
A. The proteins are first completely synthesized in the cytosol. B. The signal recognition particle (SRP) does not enter the ER lumen. C. The polypeptide signal sequence is cleaved by the peptide translocation complex. D. The SRP receptor faces the ER lumen side of the ER membrane.
Which genetic event is a source of new alleles within a population?
a. Mutation b. Crossing over during Meiosis I c. Independent assortment during Meiosis I d. Change in chromosomal number e. Fertilization
Increased carbon dioxide concentrations may contribute to
a. ozone depletion. b. global warming. c. eutrophication. d. groundwater contamination. e. biomagnification.
The category of organisms that get their energy and nutrients by feeding on the tissues, wastes, or remains of other
organisms are generally called ____.
a. producers b. prokaryotes c. consumers d. archaea e. plants