Which of the following organisms has a pattern of gastrulation that is the most similar to humans?
a. amphibians
b. birds
c. drosophila
d. sea urchin
e. zebra fish
B
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What is true about about mammalian red blood cells?
A. Red blood cells are also called leukocytes. B. A mature red blood cell is shaped like a biconcave disc because it has no nucleus. C. Red blood cells develop from lymphoid stem cells. D. Red blood cells contain albumin. E. Aged red blood cells are removed from the blood by the kidneys.
Every experiment requires a(n) ____ as a baseline for comparison, a(n) ____ variable to test, and a(n)___ variable to measure.
a. independent (predictor), dependent (outcome), control group b. control group, dependent (outcome), independent (predictor) c. control group, independent (predictor) ,dependent (outcome) d. none of the above
Four of the five answers listed below are characteristic reactions of the complement system to
invaders. Select the exception. a. causes an amplifying cascade of reactions to invaders b. triggers the secretion of histamines c. causes invading cells to lyse d. enhances the recognition of invaders by phagocytes e. creates gradients that attract phagocytes
Extensive epiphytes are found in the tropical dry forests
____________________ Indicate whether the statement is true or false.