Biology MCQs

31. The type of placenta found in humans is called __.
[A] Discoidal
[B] Cotyledonary
[C] Zonary
[D] Diffuse

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32. Whooping cough is caused by which of the following causative agent?
[A] Pasteurella pestis
[B] Clostridium tetani
[C] Bordetella pertussis
[D] Human papillomavirus

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33. What is Campylobacter abortion in animals?
[A] Abortions after 4-8 months of pregnancy
[B] incubation period is generally 1-2 weeks
[C] abortion in late pregnancy
[D] All of the above

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34. Which of the following section of DNA provides information for one protein?
[A] Nucleus
[B] Chromosomes
[C] Trait
[D] Gene

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35. Which legumes have a symbiotic relationship with two nitrogen-fixing bacteria?
[A] Crotalaria juncea
[B] Sesbania aculeata
[C] Sesbania rostrata
[D] Cyamopsis tetragonoloba

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36. A molecule that contains nitrogen and has the chemical properties of a base is called __
[A] RNA
[B] Nitrogenous base
[C] Bacteria
[D] Plasmid

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37. How many approaches are there in order to clone the complete genome?
[A] 1
[B] 2
[C] 3
[D] 4

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38. What does Insulin do?
[A] Increases blood sugar
[B] Decreases blood sugar
[C] Constricts blood vessels
[D] Stimulates lactation

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39. Which phenomenon do bats or dolphins use to find prey, predators or obstacles?
[A] Refraction of sound
[B] Echo location
[C] Formation of beats
[D] Scattering of sound

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40. In the context of trans-fats, which of the following statements is not correct?
[A] They have a shorter shelf-life than natural fats
[B] Their consumption increases LDL cholesterol and decreases HDL cholesterol
[C] WHO has called for their elimination by 2023
[D] They are produced from the industrial process of hydrogenation

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