Biology
Which of the following plays an important role in photosynthesis?

Centrosome
Tonoplast
Nematoblast
Chloroplast

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Biology
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?

You need an antiseptic, not an antibiotic
Having waited a day, it is too late to take an antibiotic
You are infected by a virus
You need to be vaccinated instead of taking an antibiotic

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Biology
Which one among the following statements is correct ?

Except the pulmonary artery, all other arteries carry oxygenated blood
All veins carry oxygenated blood
All arteries carry oxygenated blood
Except the pulmonary vein, all other veins carry oxygenated blood

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