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261. One day you wake with a sore throat and a runny nose. Your doctor takes a swab from your throat, sends it to a lab, and telephones you the next day to say that antibiotic will not help you get better. Which of the following is the most likely reason for the doctor's statement?
- A. Having waited a day, it is too late to take an antibiotic
- B. You need an antiseptic, not an antibiotic
- C. You need to be vaccinated instead of taking an antibiotic
- D. You are infected by a virus
- Check Answer | Discussion
262. Myopia is connected with
263. Our skin, when exposed to excess sunlight, becomes dark. This is because our skin pigments called
264. Other than spreading malaria, anopheles mosquitoes are also vectors of
265. Osmosis is the flow of solution from higher concentration to a solution of lower concentration through a semi permeable membrane. What is incorrect in this statement?
- A. Exact concentration of solution is not given
- B. Character of semi permeable membrane is not given
- C. The flow of solution is not possible through semi permeable membrane
- D. All are incorrect
- Check Answer | Discussion
266. Neurospora is used as genetic material because
- A. it has short life cycle of 10 days
- B. the product of single meiosis can be easily analysed
- C. meiotic products are linearly arranged in the form of ordered tetrads
- D. is a diploid fungus
- Check Answer | Discussion
267. Pollen grains in plants are produced in
268. Radical vascular bundles are those in which
- A. xylem is surrounded by phloem
- B. phloem is surrounded by xylem
- C. xylem and phloem occur on the same radius
- D. xylem and phloem occur on the different radii
- Check Answer | Discussion
269. Ramapithecus and Cro-Magnon man are considered
270. Oxygen in our blood is transported by a protein named
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