The spinal cord is enclosed by the vertebral column and layers of protective membranes. What are these membranes called?
A. neural net
B. white matter
C. dorsal root
D. meninges
E. viscera
D. meninges
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Roots and shoots are similar in that:
A. primary growth in both roots and shoots results from the apical meristem. B. actively growing roots are much thicker than stems. C. the root and shoot apical meristems are both covered by a protective cap when actively growing. D. new meristem in the roots and shoots develop from the pericycle. E. both roots and shoots contain a waxy band around their endodermal cells, protecting the vascular tissue.
Recycling of used eIF2 (eIF2-GDP), after it has served its rolein translation initiation, is facilitated by:
A. dephosphorylation of eIF2. B. phosphorylation of the GDP on eIF2 to recreate the active eIF2-GTP. C. release of the GDP by a guanine nucleotide exchange factor. D. dephosphorylation of eIF2.
Consider the consequences of a harmless prey that evolves toward mimicry of a model that has an antipredator defense (Batesian mimicry). What happens to the effectiveness of this defense as more and more prey in the population are harmless mimics? Then consider what happens when a species with bad taste evolves to resemble a model that stings (Mullerian mimicry).
A. The increased number of Batesian mimics dilutes or weakens the protection afforded by the warning color pattern, but the addition of more Mullerian mimics only strengthens the protective mimicry complex. B. The number of both Batesian and Mullerian mimics is limited because both dilute the protection afforded by the warning color pattern. C. The number of Mullerian mimics is limited because they dilute the protection afforded by the warning color pattern, but the addition of more Batesian mimics only strengthens the protective mimicry complex. D. The number of both Batesian and Mullerian mimics is unlimited because they both reinforce the protection afforded by the warning color pattern.
Describe the role of producers in a food web. Are producers the basis of all food webs? Justify your answer