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Home ‣ Biochemistry ‣ Water, pH and Macromolecules See What Others Are Saying!
- Question
The lone pair electrons on oxygen in a H20 molecule
Options- A. carry a partial positive charge
- B. are not important for the properties of water
- C. carry a partial negative charge
- D. form covalent bonds in ice
- Correct Answer
- carry a partial negative charge
- 1. Deoxyribonucleoside triphosphates, being need in the chain termination methods are
Options- A. dATP
- B. dGTP and dCTP
- C. dTTP
- D. all of these Discuss
- 2. When a __________ reaches its __________ , there is a specific means of receiving it and acting on the message. This task is the responsibility of specialized proteins called __________ .
Options- A. signaling molecule; receptor; G proteins
- B. signaling molecule; target cell; G proteins
- C. signaling molecule; target cell; receptors
- D. kinase; receptor; proteases Discuss
- 3. In hemoglobin, allosteric effects occur
Options- A. only in humans
- B. for maintaining Fe in the Fe2+ state
- C. to minimize oxygen delivery to the tissues
- D. to maximize oxygen delivery to the tissues Discuss
- 4. Which of the following white blood cells act as scavengers when they engulf and digest pathogens?
Options- A. Macrophages
- B. T cells
- C. B cells
- D. Lymphocytes Discuss
- 5. An antigen preparation and an antibody preparation are tested by immunodiffusion. Three bands are found, indicating that
Options- A. there was more than one antigen
- B. the antibody was impure
- C. the temperature was too high
- D. there was one antibody and one antigen Discuss
- 6. Each tRNA molecule has a cloverleaf secondary structure consisting of
Options- A. three stem loops
- B. two stem loops
- C. four stem loops
- D. either (a) or (b) Discuss
- 7. Which polymerase is active in DNA repairing
Options- A. Polymerase I
- B. Polymerase II
- C. Polymerase III
- D. none of these Discuss
- 8. What type of B cell is like a tiny factory that produces antibodies identical to the B cell receptor that bind to the original antigen?
Options- A. T cells
- B. Memory cells
- C. Plasma cells
- D. Macrophages Discuss
- 9. Each replication bubbles consists of
Options- A. 3 replication forks
- B. 2 replication forks
- C. 4 replication forks
- D. 1 replication forks Discuss
- 10. Selenium is an essential component of the enzyme glutathione peroxidase which
Options- A. scavenges toxic hydoperoxycompounds in tissues
- B. reduces toxic hydoperoxycompounds in tissues
- C. oxidizes toxic hydoperoxycompounds in tissues
- D. none of the above Discuss
More questions
Correct Answer: all of these
Correct Answer: signaling molecule; target cell; receptors
Correct Answer: to maximize oxygen delivery to the tissues
Correct Answer: Macrophages
Correct Answer: there was more than one antigen
Correct Answer: three stem loops
Correct Answer: Polymerase II
Correct Answer: Plasma cells
Correct Answer: 2 replication forks
Correct Answer: scavenges toxic hydoperoxycompounds in tissues
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