Which of the following types of cell cleavage is found most often for protostomes?
a. spiral, indeterminate cleavage
b. radial, indeterminate cleavage
c. radial, determinate cleavage
d. spiral, determinate cleavage
Ans: d. spiral, determinate cleavage
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Each tier of the biomass pyramid depicts the
__________ of all the organisms in an ecosystem. a. size b. number of species c. dry weight d. total weight e. total utilization of materials
If the frequency of PKU (an autosomal recessive disease) is 1%, what percentage of the population are completely unaffected (homozygous dominant or carrier)?
What will be an ideal response?
Which of the following statements best describes secondary endosymbiosis?
A. A host cell ingests two or more symbionts simultaneously. B. A host cell without plastids ingests a prokaryotic cell. C. A host cell manufactures its own symbiont and later acquires another one by phagocytosis. D. A host cell ingests another cell already containing a primary symbiont. E. A host cell ingests one symbiont and then later ingests another one.