If an animal has an open circulatory system, it will not have
a. a heart.
b. respiratory organs.
c. oxygen-carrying pigments.
d. transport of nutrients.
e. capillaries.
E; Open circulatory systems, by definition, bathe tissues directly in blood or the equivalent. They do not exchange gases and nutrients across capillaries and may not even have arteries and veins leading to and from the heart. They do have hearts to move the fluid around (choice a) and the blood will carry nutrients (choice d), and sometimes (but not always) respiratory pigments (choice c). Creatures with open circulatory systems may uses gills, tracheae, or book lungs as respiratory organs (choice b).
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a. sand b. humus c. clay d. silt e. organic matter
Why is there a wide variation in skin color in humans?
A. Crossing-over increases the rate of color variation. B. Skin color is a polygenic trait. C. Environmental changes like improvements in diet change the color of the skin over time. D. Artificial selection causes variation in skin color. E. Genetic drift selects for genes that blend skin colors.
The ABC genes in the model of Arabidopsis flower development are organ-identity genes that are also:a
segmentation genes. b. homeotic genes. c. gap genes. d. translation factors genes. e. growth factor genes.
Which is NOT a component of a Gram-Negative bacterium's wall?
A. peptidoglycan B. teichoic acid C. N-acetylmuramic acid D. diaminopimelic acid E. N-acetylglucosamine