Since fibrinogen is always present in the blood but the blood does not clot, ____ must normally be absent
a. prothrombin
b. thrombin
c. calcium
d. red blood cells
e. platelets
B
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The net energy yield from one glucose molecule through the process of glycolysis is
A. 2 ATP. B. 6 ATP. C. 30 ATP. D. 36 ATP.
Understanding the evolution of endothermy requires the resolution of a paradox: Increasing the resting metabolic rate can provide heat to raise the body temperature, but without insulation (hair or feathers) that heat is rapidly lost to the
environment. But a layer of insulation does not benefit a vertebrate unless the animal has a high metabolic rate. Discuss the evidence suggesting that Mesozoic synapsids and sauropsids had developed both high metabolic rates and insulation, and identify the puzzling gaps in the information currently available.
Which of the following statements regarding calcium homeostasis is true?
A. When blood calcium levels are too low, osteoclast activity increases. B. Parathyroid hormone increases calcium loss from the kidney. C. Increased osteoblast activity increases blood calcium levels. D. Calcitonin elevates blood calcium levels. E. Parathyroid hormone inhibits osteoclast activity.
The conjunctiva is a layer of tissue that lines the inner surface of the eyelids and covers most of the anterior surface of the eye.
Answer the following statement true (T) or false (F)