Unlike in animal meiosis, meiosis in plants gives rise to
a. diploid spores.
b. haploid spores.
c. diploid gametes.
d. haploid gametes.
e. cells without walls.
B
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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.
Chytridiomycetes produce enzymes that digest cellulose, chitin, and similar molecules. These fungi are contributing to the decline of amphibians worldwide through what mechanism?
A. by digesting cellulose in the cell wall of the frog's cells B. by digesting chitin in the cell wall of the frog's cells C. by infecting their lungs D. by killing their eggs in the water E. by digesting keratin in the frog's skin
If we assume that carbon is the sole nutrient needed by sea slugs to drive their cellular respiration, then based on the graph, during which season(s) is it LEAST necessary for P. ianthina to act as a chemoheterotroph?
A) winter B) spring C) summer D) fall
Gram-negative cells contain a periplasmic space that is __________
a. a site of endocytosis b. filled with lysozyme c. rich in degradative enzymes d. abundant in teichoic acid e. the site of protein synthesis