In angiosperms, the process of ________ ensures that the endosperm will develop only in ovules containing a fertilized egg
A) cytogenesis
B) meiosis
C) double fertilization
D) fragmentation
Answer: C
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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.
The bone marrow must continuously generate new red blood cells because the life span of a typical red blood cell is only ________
The life span is even shorter in individuals with sickle-cell trait, which accounts for the protective effects against malaria. Fill in the blank(s) with correct word
Gram-positive bacteria would stain ____ in a gram stain because of a thick layer of ____ in their cell walls
a. green; cellulose b. red; polysaccharides c. green; peptidoglycan d. purple; peptidoglycan e. purple; polysaccharides
Plague is a quarantinable disease
a. true b. false