The definition of simple primary tissues is that they are composed of which of the following?
A. one or two simple cell types
B. several cell types
C. many cell types
D. All of the choices are correct.
E. None of these choices is correct
A. one or two simple cell types
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When Calvin injected 14C labeled CO2 into cultures of green algae, what result was obtained because the molecule accepting the CO2 was unstable?
A. Radioactivity first appeared in glucose. B. Radioactivity appeared last in 3-phosphoglycerate. C. Radioactivity first appeared in ribulose bisphosphate. D. Radioactivity appeared last in ribulose bisphosphate. E. Radioactivity first appeared in 3-phosphoglycerate. F. Radioactivity appeared last in glucose.
Which group of adult tissues is derived from mesoderm?
a. lining of digestive tract, liver, pancreas b. muscles, bones, cartilage c. skin, brain, retina d. skin, liver, pancreas e. lining of respiratory tract, thyroid gland, urinary bladder
Fever enhances an immune response by ____
a. decreasing the rate of enzyme activity b. increasing phagocytosis of invading pathogens c. reducing blood flow to the site of infection d. decreasing the reproduction rate of microorganisms e. increasing heart rate and respiration
Although the genetic contributions of egg and sperm
nuclei are equal, the egg contributes more to cell differentiation because of a. its energy reserves. b. its cytoskeletal elements. c. its specialized proteins. d. its maternal messages. e. all of these.