Which of the following statements about the immune system is TRUE?
A. Neutrophils, basophils, eosinophils, and monocytes originate in bone marrow.
B. Natural killer cells produce specific antibodies that kill bacteria and viruses.
C. Mast cells are derived from monocytes.
D. Plasma cells are derived from T lymphocytes.
E. Macrophages are derived from neutrophils.
A
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Which of the following is the correct sequence of events in bulk-phase endocytosis shown in the figure?
a) plasma membrane forms vesicle around extracellular droplets > fusion of lysosome and vesicle > vesicle formed pinches off into cytosol > digestion by enzymes > solutes released b) solutes released > plasma membrane forms vesicle around extracellular droplets > fusion of lysosome and vesicle > vesicle formed pinches off into cytosol > digestion by enzymes c) vesicle formed pinches off into cytosol > solutes released > plasma membrane forms vesicle around extracellular droplets > fusion of lysosome and vesicle > digestion by enzymes d) vesicle formed pinches off into cytosol > plasma membrane forms vesicle around extracellular droplets > fusion of lysosome and vesicle > digestion by enzymes > solutes released e) plasma membrane forms vesicle around extracellular droplets > vesicle formed pinches off into cytosol > fusion of lysosome and vesicle > digestion by enzymes > solutes released
A 20-year-old African American woman comes to her physician complaining of bloating, gas, diarrhea, and cramping pain that have occurred approximately 2-3 times per week for the past 2 months
The doctor asks her to keep a diary of her diet and symptoms, which reveals that the symptoms most often occur after ingesting dairy products. The patient most likely has a relative deficiency of which of the following molecules in the brush border of her enterocytes? A. sucrase/isomaltase B. SGLT1 C. GLUT5 D. enterokinase E. GLUT2 F. lactase
The countercurrent multiplier system
A. is found in the collecting duct. B. is assisted by hormones. C. has fluid flowing in parallel tubes in opposite directions. D. maintains the solute concentration of the medullary interstitial fluid. E. has fluid flowing in parallel tubes in opposite directions and maintains the solute concentration of the medullary interstitial fluid.
You are examining different dietary supplements, trying to choose one for your child. Each supplement contains only four amino acids. Which supplement would be most suitable for your child's essential amino acid needs?
A. Supplement X containing alanine, arginine, tyrosine, and serine B. Supplement Z containing arginine, histidine, lysine, and methionine C. Supplement Y containing tyrosine, lysine, glycine, and asparagine D. Supplement W containing phenylalanine, lysine, cysteine, and valine