Predict what would happen to a sponge that could no longer produce spicules.
A. Intracellular digestion would cease.
B. Water circulation would be greatly impeded.
C. Gametes could no longer be produced.
D. Vulnerability to predation would increase.
D. Vulnerability to predation would increase.
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In some studies that use observational rather than experimental data, investigators develop ____, which conceptually
predict what they would see if a particular factor had no effect.
a. control treatments b. null models c. experimental controls d. null treatments e. experimental models
Steroid hormones generally function by ________
a. being released by certain cells and affecting only the cells in close proximity to the source b. binding to receptors on the plasma membrane and triggering cAMP formation inside the cell c. entering target cell nuclei, binding to receptors and affecting gene transcription d. diffusing across the synaptic cleft and binding to receptors on postsynaptic neurons
The most serious teratogenic effects of intrauterine rubella infection occur if it is acquired during the third trimester.
Answer the following statement true (T) or false (F)
Microvilli are present to increase the area available for absorption in the
A. stomach. B. gallbladder. C. small intestine. D. large intestine.