What is a disadvantage to having an
exoskeleton?
a. muscles do not work effectively
b. the body tissues are unprotected by it
c. it does not grow with the animal
d. it prevents the possibility of flying
e. more than one of these is a disadvantage to
an exoskeleton
C
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Intestinal protozoan infections are typically spread by
A. the respiratory route. B. blood transfusion. C. body fluids. D. the fecal-oral route.
Active muscle cells produce ATP by four of the following means. Which is the exception?
a. muscle tetanus b. creatine phosphate system c. anaerobic metabolism d. aerobic metabolism e. glycolysis
When one plant is shaded by another, why is the ratio of far-red to red light increased compared to an unshaded plant?
A. Auxin absorbs mostly far-red light. B. Shade is enriched in far-red wavelengths of light. C. Phytochrome in the taller plant absorbs most of the red light. D. Far-red light mostly reflects off the surface of the soil while red light is mostly absorbed. E. As light passes through the leaves of the taller plant, most of the red light is absorbed by chlorophyll.
A(n) ________ is a complex community of various types of microbes that adhere to surfaces.
A. aggregate B. colony C. CFU D. biofilm E. inoculum