Too much calcium in the bloodstream, a condition called hypercalcemia, can be very dangerous. The thyroid gland releases a hormone, calcitonin, when calcium is too high. How does calcitonin lower calcium levels in the blood?
A) It increases both osteoclast and osteoblast activity.
B) It reduces both osteoclast and osteoblast activity.
C) It reduces osteoclast activity and increases osteoblast activity.
D) It increases osteoclast activity and reduces osteoblast activity.
Answer: C
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The first step for directly linking a microbe to a specific disease according to Koch's postulates is to
A) culture the blood or other body fluid from a diseased animal using nutrient medium. B) inject a sample of blood or other body fluid from a diseased animal into a healthy animal. C) obtain a sample of blood or other body fluid from a diseased animal. D) compare the blood of a sick animal to blood obtained from a healthy animal. E) isolate microbes from the blood of healthy animals.
What enzyme breaks down ATP?
What will be an ideal response?
________ molecules deliver amino acids to ribosomes during translation.
A. Messenger RNA (mRNA) B. Ribosomal RNA (rRNA) C. Transfer RNA (tRNA) D. Heterogeneous nuclear RNA (hnRNA)