IGCSE O Level Biology Exam Prep MCQs – Mock Test 20

Effects of pH on enzymes MCQ with Answers PDF Download – Test 20

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Effects of pH on enzymes MCQ – Mock Test 20 PDF Download

MCQ 96: Amylase becomes denatured at a alkaline pH of:

MCQ 97: In mammals, Bone marrow produces:

red blood cells
white blood cells
platelets
antibodies

MCQ 98: Root pressure is enhanced as the:

water is needed in leaves for photosynthesis
cells around xylem are low in salts and amino acids
more water is available for the plant
concentration gradient makes osmosis happen at a greater speed

MCQ 99: Structural component of hemoglobin is:

manganese
zinc
iron
chorine

MCQ 100: Thyroxin is secreted from:

thiamine deficiency
theological inheritance
thyroid glands
muscles used for breathing

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