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- Question
What is the exact name of the classical Watson-Crick double helix DNA?
Options- A. A-DNA
- B. B-DNA
- C. Z-DNA
- D. X-DNA
- Correct Answer
- B-DNA
- 1. According to the fluid mosaic model of cell membranes,
Options- A. the most common type of molecules in the membrane are proteins
- B. basic membrane structure results from how the proteins interact with water
- C. the membrane is a highly mobile mixture of phospholipids and proteins
- D. the unique properties of cell types are determined by their phospholipids Discuss
- 2. Which of the following is correct?
Options- A. Membranes form boundaries around the cell and distinct subcellular components
- B. Membranes act as selectively permeable barrier
- C. Membranes contain varying amount of lipid and protein and some contain small amount of carbohydrates
- D. All of the above Discuss
- 3. Cholesterol is essential for normal membrane functions because it
Options- A. plugs up the cardiac arteries of older men
- B. cannot be made by higher organisms
- C. keeps membranes fluid.
- D. spans the thickness of the bilayer Discuss
- 4. In gel electrophoresis, DNA molecules migrate from __________ to __________ ends of the gel.
Options- A. negative ... positive
- B. basic ... acidic
- C. long ... short
- D. positive to negative Discuss
- 5. Why must the radiation source for fluorescence spectrometry be more powerful than for absorption spectroscopy?
Options- A. Because the magnitude of the output signal is proportional to the power of the incident radiation
- B. Because the sample won't fluoresce if the incident radiation is of low power
- C. To allow for scattering by the sample
- D. None of the above Discuss
- 6. In cellular immunity, T lymphocytes are responsible for the recognition and killing of foreign invaders. The cells are
Options- A. cytotoxic T lymphocytes (CTL)
- B. killer T cells
- C. both (a) and (b)
- D. none of the above Discuss
- 7. Which of following RNA characteristically contains unusual purines and pyrimidmes?
Options- A. rRNA
- B. nRNA
- C. mRNA
- D. tRNA Discuss
- 8. Selenium deficiency leads to
Options- A. liver necrosis
- B. diarrhea
- C. multiple sclerosis
- D. Crohn's disease Discuss
- 9. Peptides in the fully extended chain conformation
Options- A. have Y = F = 180°
- B. do not occur in nature
- C. also have a cis geometry in their peptide bonds
- D. are equivalent to the (3-sheet structure Discuss
- 10. The binding of ligands to many G-proteins linked receptors leads to shortlived
Options- A. increase in the concentration of certain intracellular signaling molecules called second messenger
- B. decrease in the concentration of certain intracellular signaling molecules called second messenger
- C. increase in the concentration of certain extracellular signaling molecules called first messenger
- D. decrease in the concentration of certain extracellular signaling molecules called first messenger Discuss
More questions
Correct Answer: the membrane is a highly mobile mixture of phospholipids and proteins
Correct Answer: All of the above
Correct Answer: keeps membranes fluid.
Correct Answer: negative ... positive
Correct Answer: Because the magnitude of the output signal is proportional to the power of the incident radiation
Correct Answer: both (a) and (b)
Correct Answer: tRNA
Correct Answer: liver necrosis
Correct Answer: have Y = F = 180°
Correct Answer: increase in the concentration of certain intracellular signaling molecules called second messenger
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