All Free Biology MCQs with Answers
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19844 questions · page 545 of 1985
5441. Phenylalanine is an:
- A. Promote health of plants
- B. Used to stimulate the sperms to divide
- C. An organic chemical used to make aspartame
- D. Used to make holes in the plasma membrane
Explanation: Biochemists discovered a strain of bacteria that is specially good at producing phenylalanine; an organic chemical needed to make aspartame, the dipeptide sweetener better known as Nutrasweet.
Correct answer: An organic chemical used to make aspartame5442. Electric current in tissue culture used for:
- A. Promote health of plants
- B. Used to make holes in the plasma membrane
- C. An organic chemical used to make aspartame
- D. Used to stimulate the sperms to divide
Explanation: The electric current makes tiny, selfscaling holes in the plasma membrane through which genetic material can enter.
Correct answer: Used to make holes in the plasma membrane5443. Chemical bath:
- A. Used to stimulate the eggs to dive
- B. Promotes health of plants
- C. An organic chemical used to make aspartame
- D. Used to make holes in the plasma membrane
Explanation: A specially prepared chemical bath was used to stimulate the eggs to divide and begin development. Now that scientists
Correct answer: Used to stimulate the eggs to dive5444. Hypercholesterolmia is:
- A. Kills the cancer cells
- B. High level of blood cholesterol
- C. Is also done in cancer patients
- D. A condition in which liver cells lack receptor for removing cholesterol
Explanation: Hypercholesterolemia a condition that develops when liver cells lack a receptor for removing cholesterol from the blood. The high levels of blood cholesterol make the patient subject to fatal heart attacks at a young age.
Correct answer: A condition in which liver cells lack receptor for removing cholesterol5445. Fatal heart attacks in a young:
- A. Kills the cancer cells
- B. A condition in which liver cells lack receptor for removing cholesterol
- C. High level of blood cholesterol
- D. Is also done in cancer patients
Explanation: The high levels of blood cholesterol make the patient subject to fatal heart attacks at a young age.
Correct answer: High level of blood cholesterol5446. Gene therapy:
- A. Kills the cancer cells
- B. High level of blood cholesterol
- C. A condition in which liver cells lack receptor for removing cholesterol
- D. Is also done in cancer patients
Explanation: Once the bone marrow stem cells were protected it was possible to increase the level of chemotherapy to kill the cancer cells.
Correct answer: Kills the cancer cells5447. Chemotherapy:
- A. Kills the cancer cells
- B. High level of blood cholesterol
- C. Is also done in cancer patients
- D. A condition in which liver cells lack receptor for removing cholesterol
Explanation: Once the bone marrow stem cells were protected it was possible to increase the level of chemotherapy to kill the cancer cells.
Correct answer: Kills the cancer cells5448. In-vivo therapy:
- A. Develop into mature plants
- B. Cytokinin
- C. Mature flower
- D. To cure hemophilia
Explanation: Perhaps it will be possible to used in vivo therapy to cure hemophilia, diabetes. Parkinson disease, or AIDS. To treat hemophilia, patients could get regular doses of cells that contain normal clotting-factor genes or such cells could be placed in organoids, artificial organs that can be implanted in the abdominal cavity.
Correct answer: To cure hemophilia5449. Coconut milk contains:
- A. Mature flower
- B. Cytokinin
- C. Develop into mature plants
- D. To cure hemophilia
Explanation: Coconut milk contains the plant hormone cytokinin)
Correct answer: Cytokinin5450. Plant viruses makes:
- A. Mature flower
- B. Make the plants less productive
- C. Develop into mature plants
- D. Cytokinin
Explanation: The presence of plant viruses weakens plants and makes them less productive
Correct answer: Make the plants less productive