When a scientist performs measurements in an experiment and does not know if the subject is part of the experimental or the control group, it is known as a ________ measurement.
A. blind
B. qualitative
C. statistical
D. null
Answer: A
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Calcitonin causes:
a. an increase in the blood concentration of calcium b. a breakdown in the bone matrix c. a decrease in the blood concentration of calcium d. both A and B above
The acrosome of the spermatozoon
a. contains the sperm's genetic information b. contains mitochondria for energy production c. is a fructose-filled vesicle that provides energy for the spermatozoa d. contains enzymes that enable the sperm to penetrate the ovum e. contains microtubules that slide past each other to provide the sperm with motility
The nephron loop makes a hairpin turn within the ________ and its ________ limb ends at the distal convoluted tubule.
A. medulla; descending B. medulla; ascending C. cortex; ascending D. cortex; descending
What element is necessary for the production of triiodothyronine (T3 ) and thyroxine (T4)?
A) iodine B) calcium C) magnesium D) potassium