In mammals, the ____ is a temporary center for the formation of blood cells
a. amnion
b. allantois
c. yolk sac
d. chorion
e. archenteron
c
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The number of Roseobacter in the ocean describes
A) species diversity. B) species richness. C) species abundance. D) species prevalence.
True or False: The bright colored patterns of a flower's petals act as signals to an insect that nectar and pollen are available, and in this way the sender manipulates the behavior of the receiver
A. true B. false
Which of the following statements comparing hemidesmosomes with desmosomes is TRUE?
A. Hemidesmosomes are anchorage junctions but desmosomes are not. B. Hemidesmosomes interact with actin filaments while desmosomes interact with intermediate filaments. C. Hemidesmosomes anchor cells to the ECM while desmosomes anchor cells to other cells. D. Hemidesmosomes are found in plant cells while desmosomes are found in animal cells. E. Both hemidesmosomes and desmosomes associate with integrin, but not cadherin molecules.
Compare and contrast receptor tyrosine kinase (RTK) signaling pathways such as the EGF–Ras–MAPK pathway with serine/threonine kinase (S/TK) signaling pathways such as the TGF? pathway with respect to (a) receptors, (b) phosphorylation targets,
(c) signal transduction from the plasma membrane through the cytoplasm to the nucleus, and (d) effects on gene regulation. What will be an ideal response?