The four different human blood types are caused by how many different alleles? What are the alleles?
What will be an ideal response?
three: IA, IB, and i
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In some cases, just a few hormone molecules binding to the surface of a cell can trigger a very large response because ____.
A. the signal is amplified by activation of transcription factors that each catalyze multiple reactions B. each hormone can bind to multiple receptors simultaneously causing amplification of the signal C. the signal is amplified by activation of enzymes that each catalyze multiple reactions D. each hormone can bind to transcription factors simultaneously causing amplification of the signal E. the hormone triggers the cell to release more hormones, amplifying the signal
You discover a fungus that is associated with plant roots, with hyphae that actually penetrate the root cells and
produces tree-like structures within the root cells. Into which group should you classify this fungus?
a. Glomeromycota b. Basidiomycota c. Chytridiomycota d. Zygomycota e. Ascomycota
Are perfect flowers really perfect? What will be an ideal response?
Viruses can enter animal cells by
A. endocytosis. B. exocytosis. C. poking holes in their membranes and entering. D. triggering an active transport mechanism.