The tissue that regrows a leaf from its base is the
A. intercalary meristem.
B. lateral meristem.
C. vascular bundle.
D. apical meristem.
E. tracheid.
A. intercalary meristem.
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According to Fig 9.13, phosphate groups play a key role in receptor kinase activation by:
A. activating the receptor so that the receptor is capable of binding its signal. B. activating the dimerization of the receptor kinase proteins in the membrane. C. activating receptor kinase activity. D. providing binding sites to recruit and activate signal-transduction proteins. E. All of these choices are correct.
The regeneration of what CO2 acceptor molecule allows for continuous carbon assimilation in the Calvin cycle?
A) glyceraldehyde-3-phosphate B) dihydroxyacetone phosphate C) ribulose-1,5-bisphosphate D) glycerate-1,3-bisphosphate E) 3-phosphoglycerate
The left side of the heart contains which of the following?
a. pulmonary artery b. tricuspid valve c. oxygenated blood d. deoxygenated blood
Why is the cost of sex sometimes also referred to as the "cost of males"?
a. Males do not contribute genes to the next generation. b. Males do not produce new offspring. c. With finite resources, males take the place of offspring producing females. d. Sperm cells do not contribute any substantial energy resources to the eggs they fertilize. e. B, C, and D.