细胞生物学选择题
52. Which organelle is a type of vesicle? ( B )
A. Ribosome B. Lysosome C. Endoplasmic Reticulum D. Nucleus
53. What part of the cell is responsible for breaking down and digesting things? ( B )
A. Ribosomes B. Lysosomes C.Endoplasmic reticulum D. Golgi apparatus
54. What organelle processes and packages proteins before sending them through the cell? ( D )
A. Endoplasmic Reticulum B. Ribosome C. Mitochondria D. Golgi Apparatus
55. This is (are) the site of protein synthesis in the cytoplasm. ( B )
A. smooth endoplasmic reticulum B. ribosomes C.mitochondria D. golgi apparatus
56. The two ways in which lysosomes and peroxisomes are similar is that they ( A )
A. are structurally similar to vacuoles and contain enzymes
B. digest food particles and perform respiration
C. neutralize hydrogen peroxide and perform photosynthesis
D. transport proteins and physically protect the cell
57. a protein-RNA complex that recognizes and transports specific proteins to the endoplasmic reticulum
A. signal recognition particle B. ribosome C. docking protein D. signal peptide
58. Proteins that stay within the nucleus are produced A
A) on free ribosomes in the cytoplasm. B) in the nucleolus.
C) on ribosomes attached to rough ER. D) on ribosomes and pass through the Golgi apparatus.
59. According to the signal hypothesis, ribosomes are directed to the ER membrane B
a. by a specific characteristic of the ribosome itself, which distinguishes free ribosomes from bound ribosomes.
b. by a certain amino acid sequence at the beginning of the polypeptide chain being synthesized by the ribosome.
c. by moving through a channel from the nucleus.
d. by a chemical signal given off the ER.
e. by a signal sequence of RNA that precedes the start codon of the message.
60. What is one function of a signal sequence? D
a. to direct an mRNA molecule into the cisternal space of ER
b. to bind RNA polymerase to DNA and initiate transcription
c. to terminate translation of the messenger RNA
d. to attach ribosomes synthesizing secretory proteins to the ER
e. to signal the initiation of transcription
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