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Biological Sciences

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Cellular Organelles

Question
5 out of 6
 

A cell is isolated that does not contain a nucleus. Which of the following organelles might it contain?

A Mitochondria
B Flagella
C Golgi
D Endoplasmic reticulum
Ans. B

Cells that do not contain nuclei are prokaryotes, such as bacteria, and do not contain most other organelles. However, bacteria may contain flagella, which aids in locomotion.

Cellular Organelles Flashcard List

6 flashcards
1)
Cells grown in culture are often used to investigate the role of organelles. As culture conditions can be easily manipulated, cells can be subjected to different chemicals and their responses studied and analyzed. In one such experiment, mouse cells were incubated in the presence of high concentrations of sucrose. The cells were examined under the microscope. Crystals of sucrose were found in the lysosomes of all the cells. When sucrose was depleted from the culture medium, the sucrose crystals in the lysosomes persisted for many days, but did not affect the growth of the cells. Eventually, the sucrose crystals disappeared. The rate of disappearance is shown in the graph below (note: all graphs are the same scale). Researchers performed two additional experiments: Experiment 1: Immediately after sucrose was removed from the culture medium, the enzyme invertase was added. Invertase catalyzes the cleavage of sucrose into monosaccharides. The cells were then examined for the presence of sucrose crystals. The results are shown below. Experiment 2: Mouse cells grown in the presence of invertase (cell type A) were mixed with cells grown in the presence of sucrose (cell type B). A reagent that fuses cells was also added to the culture. After fusion, the cells (cell type AB) were grown in the absence of sucrose. The cells were then examined for the presence of sucrose crystals. The results are shown below. From the results in Experiment 1, what can you conclude about invertase?A It irreversibly inhibits sucrose production.B It catalyzed the break down of sucrose in the medium.C It was internalized by the lysosomes.D It changes the pH of the cytoplasm to catalyze sucrose.
2)
Cells grown in culture are often used to investigate the role of organelles. As culture conditions can be easily manipulated, cells can be subjected to different chemicals and their responses studied and analyzed. In one such experiment, mouse cells were incubated in the presence of high concentrations of sucrose. The cells were examined under the microscope. Crystals of sucrose were found in the lysosomes of all the cells. When sucrose was depleted from the culture medium, the sucrose crystals in the lysosomes persisted for many days, but did not affect the growth of the cells. Eventually, the sucrose crystals disappeared. The rate of disappearance is shown in the graph below (note: all graphs are the same scale). Researchers performed two additional experiments: Experiment 1: Immediately after sucrose was removed from the culture medium, the enzyme invertase was added. Invertase catalyzes the cleavage of sucrose into monosaccharides. The cells were then examined for the presence of sucrose crystals. The results are shown below. Experiment 2: Mouse cells grown in the presence of invertase (cell type A) were mixed with cells grown in the presence of sucrose (cell type B). A reagent that fuses cells was also added to the culture. After fusion, the cells (cell type AB) were grown in the absence of sucrose. The cells were then examined for the presence of sucrose crystals. The results are shown below. Which of the following statements is true for mouse cells grown in culture?A They do not normally have the ability to break down sucrose.B They make invertase but only in low levels.C Fusion with other cells reduces the ability of cells to produce invertase.D High concentrations of sucrose are lethal.
3)
Cells grown in culture are often used to investigate the role of organelles. As culture conditions can be easily manipulated, cells can be subjected to different chemicals and their responses studied and analyzed. In one such experiment, mouse cells were incubated in the presence of high concentrations of sucrose. The cells were examined under the microscope. Crystals of sucrose were found in the lysosomes of all the cells. When sucrose was depleted from the culture medium, the sucrose crystals in the lysosomes persisted for many days, but did not affect the growth of the cells. Eventually, the sucrose crystals disappeared. The rate of disappearance is shown in the graph below (note: all graphs are the same scale). Researchers performed two additional experiments: Experiment 1: Immediately after sucrose was removed from the culture medium, the enzyme invertase was added. Invertase catalyzes the cleavage of sucrose into monosaccharides. The cells were then examined for the presence of sucrose crystals. The results are shown below. Experiment 2: Mouse cells grown in the presence of invertase (cell type A) were mixed with cells grown in the presence of sucrose (cell type B). A reagent that fuses cells was also added to the culture. After fusion, the cells (cell type AB) were grown in the absence of sucrose. The cells were then examined for the presence of sucrose crystals. The results are shown below. Based on the results in Experiment 2, which of the following could be true? I. Invertase diffused from the lysosomes of cell type A into the lysosomes of cell type B. II. The lysosomes of cell type A fused with the lysosomes of cell type B. III. Invertase destroyed cell type B and only allowed cell type A to survive.A I onlyB II onlyC I and II onlyD III only
4)
Cells grown in culture are often used to investigate the role of organelles. As culture conditions can be easily manipulated, cells can be subjected to different chemicals and their responses studied and analyzed. In one such experiment, mouse cells were incubated in the presence of high concentrations of sucrose. The cells were examined under the microscope. Crystals of sucrose were found in the lysosomes of all the cells. When sucrose was depleted from the culture medium, the sucrose crystals in the lysosomes persisted for many days, but did not affect the growth of the cells. Eventually, the sucrose crystals disappeared. The rate of disappearance is shown in the graph below (note: all graphs are the same scale). Researchers performed two additional experiments: Experiment 1: Immediately after sucrose was removed from the culture medium, the enzyme invertase was added. Invertase catalyzes the cleavage of sucrose into monosaccharides. The cells were then examined for the presence of sucrose crystals. The results are shown below. Experiment 2: Mouse cells grown in the presence of invertase (cell type A) were mixed with cells grown in the presence of sucrose (cell type B). A reagent that fuses cells was also added to the culture. After fusion, the cells (cell type AB) were grown in the absence of sucrose. The cells were then examined for the presence of sucrose crystals. The results are shown below. Another sugar, mannose, was added to mouse cells, and mannose crystals formed inside lysosomes. Similar to sucrose crystals, the mannose crystals disappeared in a few days after the sugar was removed from the medium. If invertase were added to the culture immediately after mannose was removed, what would you predict would happen?A The mannose crystals would disappear in less than two days.B The mannose crystals would disappear within a few days.C Sucrose crystals would form.D Mannose crystals would appear in the cytoplasm.
5)
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