What are soil mineral particles that range from 0.02 to 0.002 mm in diameter called?
a. sand
b. humus
c. clay
d. silt
Ans: d. silt
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What would the result be if histamine and nitric oxide were NOT secreted during a puncture injury?
A. The blood vessels would dilate. B. The blood vessels would be more permeable. C. The blood mast cells would constrict. D. Healing would be slower. E. Healing would not take place at all.
Which of the following correctly traces the pathway of urine flow in vertebrates?
a. Collecting tubule ureter bladder urethra b. Renal vein ureter bladder urethra c. Nephron urethra bladder ureter d. Cortex medulla bladder ureter e. Renal pelvis medulla bladder urethra
In the figure, "Letter B" represents:
a. Non-sister chromatids b. Sister chromatids c. Non-homologous chromosomes d. Homologous chromosomes
What happens when a ligand binds to a ligand-gated sodium channel?
A. Sodium ions flow passively from high concentration to low concentration. B. Sodium ions are pumped from low concentration to high concentration. C. Sodium ions flow passively from low concentration to high concentration. D. There is no net flow of sodium ions.