The stretch sensors of the sensory neurons in the human knee-jerk reflex are located in the _____
A) cartilage of the knee
B) quadriceps muscles on the front side of the thighs
C) hamstring muscles on the back side of the thighs
D) brain, the sensorimotor relay
B
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Inside nitrogen-fixing nodules, one N2 molecule is converted into two
A. N. B. NO. C. NO2. D. NO3. E. NH3.
Deficiencies of ____may result in muscular weakness
a. iron and copper b. iron and manganese c. iodine and iron d. phosphorus and calcium e. phosphorus and potassium
Which of the following diagnostic procedures depends on precipitation of antigen-antibody complexes?
A) blood typing B) immunodiffusion C) viral hemagglutination inhibition tests used to diagnose viral infections D) ELISA E) fluorescent antibody tests
Penicillins and cephalosporins
A. block the peptidases that cross-link glycan molecules. B. attach to the 30S ribosomal subunit and disrupt protein synthesis. C. are metabolic analogs of PABA and block folic acid synthesis. D. damage cell membranes. E. interfere with DNA synthesis.