When pH levels in the blood get too low, chemical buffers are released that return blood pH back to normal levels
This is an example of ___.
a. negative feedback
b. positive feedback
c. ectothermal reactions
d. sensory perception
e. endothermal reactions
ANSWER: a
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Which structure of the eye is matched appropriately with its developmental origin?
a. ectoderm ? cornea b. crystallin ? cornea c. optic cup ? lens d. crystallin ? retina e. mesoderm ? retina
DNA replication
a. occurs in the cytoplasm of the cell. b. does not require proteins. c. occurs in G1 of interphase. d. takes place in the nucleus of the cell. e. is constantly happening in a cell.
The major function of interferon-gamma is to
A. Induce the activation of resident macrophages B. Inhibit migration of macrophages from reaction sites C. Promote and maintain the proliferation of T cells D. Promote B and T cell growth
Two species regularly come into contact and form hybrids that have higher fitness than either of the parental species. What are some likely consequences of regular hybridization between these species? Check all that apply.A) Evolution of a third speciesB) Reinforcement of prezygotic isolating mechanismsC) Extinction of one or both of the parental speciesD) Increased gene flow between the parental speciesE) Complete reproductive isolation of the two original species
What will be an ideal response?