During the development of the vulva in Caenorhabditis, when the Notch ligand binds a Notch receptor on a progenitor cell:
A. signal transduction results in activation of a
set of transcription factors.
B. genes that produce the Notch ligand are
transcribed.
C. genes that produce the Notch receptor are
inhibited.
D. genes that produce the EGF receptor are
inhibited.
E. None of these choices are correct.
D
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Recall that glomeromycetes are fungi that can form symbiotic relationships (endomycorrhizae) with plants. Which of the following statements is also true of glomeromycetes? Select all correct choices
A. Glomeromycetes do not demonstrate any genetic diversity. B. Glomeromycetes can undergo a parasexual cycle. C. Genetic diversity in glomeromycetes is caused by mitotic recombination. D. Genetic diversity in glomeromycetes is caused by meiotic recombination. E. Glomeromycetes can undergo a sexual cycle.
Which of the following statements about allosteric control of enzymatic activity is true?
A. Allosteric proteins are generally composed of a single protein. B. Heterotropic allosteric effectors compete with substrate for binding sites. C. Homotropic allosteric effectors compete with product for binding sites. D. Allosteric effectors enhance the hyperbolic nature of V0 versus [S] kinetic plots. E. Allosteric effectors give rise to the sigmoidal nature of V0 versus [S] kinetic plots.
All the products of oogenesis are equal in size and content.
Answer the following statement true (T) or false (F)
Most pathogens have one preferred portal of entry.
a. true b. false