Derivatives of the mesoderm include ________
A) the skeletal system
B) nervous tissue
C) glands of the digestive tract
D) None of the listed responses is correct.
A
Explanation:
B) Nervous tissue is not a derivative of mesoderm.
C) The glandular cells of the digestive tract are not derivatives of mesoderm.
D) One of the listed answers is correct.
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Cytokines have a _____ half-life and exert influence on ________________
A. long; immune cells only. B. long; immune and non-immune cells. C. short; immune cells only. D. short; immune and non-immune cells.
Implantation of a blastocyst:
A. normally occurs within the oviduct (fallopian tube). B. normally begins around day 21 of the typical menstrual cycle. C. occurs within 24 hours of fertilization of the oocyte. D. takes place at a time in the typical menstrual cycle when estrogen concentration in the blood is higher than progesterone concentration in the blood. E. requires the presence of high concentrations of follicle-stimulating hormone (FSH).
In phagocytosis
A) a cell membrane engulfs solid particles. B) a cell membrane engulfs droplets. C) a particle enters a cell by moving down its concentration gradient. D) a carrier molecule moves a substance across a cell membrane using ATP.
Which of the following is correct?
a. Exocytosis decreases the surface area of the plasma membrane. b. Endocytosis can help remove cytoplasmic debris from inside the cell. c. Exocytosis is triggered by the binding of a particle in the ECF to a receptor site on the plasma membrane. d. Exocytosis involves passive movement of material out of the cell. e. None of these.