Biology MCQs

31. Which of the following are examples of connective tissue?
[A] blood
[B] bone
[C] tendon
[D] All of the above

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32. What is the role of the atrioventricular valves?
[A] form a network between the arteries to veins
[B] supplying oxygenated blood away from the heart to all other parts of the body
[C] prevent blood from flowing back into the atria
[D] All of the above

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33. What is the outermost layer of the heart called?
[A] Myocardium
[B] Endocardium
[C] Epicardium
[D] None of these

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34. The male accessory glands generate fluid that nourishes the sperm called __
[A] semen
[B] seminal plasma
[C] spermatogonia
[D] testosterone

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35. Which of the following are the causes of red water?
[A] Clostridium hemolyticum
[B] Achromobacter anitratum
[C] Escherichia coli
[D] Salmonella typhimurium

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36. The conversion of N2 to ammonia is known as __
[A] Nitrification
[B] Nitrogen fixation
[C] Ammonification
[D] Denitrification

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37. 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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38. Which of the following protein is found in nails?

[A] Keratin
[B] Histone
[C] Actin
[D] Elastin

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39. The release of which of the following into ponds and wells helps in controlling mosquitoes?

[A] Snail
[B] Crab
[C] Dogfish
[D] Gambusia fish

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40. Which of the following microorganisms is used in milk curdling?
[A] Bacillus
[B] Lactobacillus
[C] Leuconostoc
[D] Acetobacter

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